Article
Polymer Science
Wenjie Yu, Ning Xiang, Maoyuan Li, Guancheng Shen, Xiaowei Zhou, Zhigao Huang, Yun Zhang, Huamin Zhou, Dequn Li
Summary: This study proposes a quantitative mathematical model between molecular orientation and birefringence, and coupling simulation of macroscopic flow field and microscopic orientation is realized through internal stress, which can more accurately simulate molecular orientation and birefringence. The effectiveness of the proposed model and simulation method is verified through experimental results.
Review
Polymer Science
Baishun Zhao, Yuanbao Qiang, Wangqing Wu, Bingyan Jiang
Summary: With the advancement of technology, ultrasonic-assisted micro-injection molding has become one of the core technologies for producing micro-parts, offering advantages such as high replication fidelity and cost-effectiveness. This review presents the latest research activities on the action mechanism of power ultrasound in various polymer micro-molding processes.
Article
Engineering, Chemical
Sara Liparoti, Daniele Sofia, Roberto Pantani
Summary: Mold temperature is crucial in determining the morphology of molded parts. This paper proposes a strategy for controlling mold temperature during the process to maintain a short processing time. A thin electrical heater is designed and adapted below the cavity surface to quickly increase and decrease the cavity surface temperature after mold closure and filling. The effect of heating power and duration on molecular orientation is analyzed and considered in the temperature and flow field during the process.
Article
Polymer Science
Xianpeng Wang, Zuguo Bao, Donglin Gao, Shiyao Huang, Li Huang, Qiuren Chen, Hailong Zhao, Weijian Han, Yahong Xu
Summary: This study investigates the effects of injection temperature, injection pressure, and fiber content on the mechanical properties of weld lines in carbon fiber-reinforced nylon (PA-CF) composites. The results indicate that the presence of weld lines negatively affects the mechanical properties of the composites, primarily due to poor fiber orientation in the weld line regions. Additionally, increasing injection temperature and pressure can improve the mechanical properties of composites with low fiber content, but weaken those with high fiber content.
Article
Chemistry, Physical
Riccardo Ivan, Marco Sorgato, Filippo Zanini, Giovanni Lucchetta
Summary: In this study, a data-driven inverse modeling approach is proposed to improve the physics-based structural simulation of short glass fiber reinforced thermoplastics. The approach optimizes the fiber orientation distribution and identifies the composite's mechanical properties using a genetic algorithm. Artificial neural networks are used as a surrogate model to reduce computational time. The proposed approach improves the prediction accuracy of the simulation results and reduces computational time.
Article
Materials Science, Composites
Ruoxiang Gao, Hao Chen, Zhezai Hu, Xuewen Cheng, Shiquan Gao, Shaohua Zhou, Peng Zhao
Summary: This study presents a novel method for predicting product strength by analyzing weld line and fiber orientation in injection molding, and successfully applies it to the gate design of an aerospace product. The results indicate that this method has great potential for mold design, product structure design, and process optimization.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Jackeline Iturbe-Ek, Alan O. Sustaita, Diego Aguilar-Viches, Jose Manuel Mata-Padilla, Carlos A. Avila-Orta, Luis E. Elizalde, Alex Elias-Zuniga, Luis Marcelo Lozano
Summary: Product miniaturization is a constant trend in industries, and ultrasonic micro injection molding (UMIM) technology has emerged as a polymer processing technique capable of achieving mass production of polymeric parts with micro-features while maintaining replicability, repeatability, and high precision. Variations in parameters such as ultrasound amplitude and processing time during UMIM process significantly modify the molecular structure of the polymer, with processing time being a more relevant factor for chain scission. The presence of polymorphism within samples produced by UMIM and some degree of chain orientation are also demonstrated.
Review
Chemistry, Physical
Mateusz Czepiel, Magdalena Bankosz, Agnieszka Sobczak-Kupiec
Summary: Injection molding is a commonly used method to manufacture plastic products of specific shape and size. The technology has gained importance over the years and is now used in various industries. This review provides information on recent research in the field of modern injection molding techniques.
Article
Chemistry, Multidisciplinary
Yilei Wang, Can Weng, Huijie Sun, Zijian Deng, Bingyan Jiang
Summary: This study investigates the demolding quality of microfluidic chips for heavy metal detection by conducting molding experiments of various polymer materials. Both experimental and simulation results show that the interfacial interactions between the polymer and the metal mold insert affect the replicability and deformation of the micro-structures. The molecular dynamics simulation helps explain the mechanisms behind these interactions and provides insights into the demolding deformation of polymer structures.
Article
Engineering, Chemical
Guanglong Wang, Junhui Cao, Shusen Hou, Peng Ding, Weixin Yu, Zhijun Yang, Jingbo Chen
Summary: The article presents a novel method of producing high-performance plastic articles based on general plastics by manipulating their morphology and structure using N,N'-dicyclohexyl-2,6-naphthalenedicarboxamide.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Polymer Science
Guan-Yan Liou, Chi-Wei Su, Po-Wei Huang, Sheng-Jye Hwang, Chao-Tsai Huang, Hsin-Shu Peng
Summary: Processing equipment and parameters are crucial for the properties of long-fiber-reinforced injection-molded thermoplastic composites. Maintaining fiber length is a challenge, and this study explores the use of a special injection molding machine to retain long fiber length. The influence of process parameters on composite properties is also investigated.
Article
Polymer Science
Chung-Chih Lin, Chao-Long Yang
Summary: In this work, a novel method is proposed to manufacture complicated hollow products without limitations on resin type and with a lower energy consumption process. This method utilizes a water-soluble core and a shell to achieve the desired internal contour of the product, resulting in improved product quality.
Article
Polymer Science
Ngoc Tu Tran, Andreas Seefried, Michael Gehde
Summary: The authors discovered a completely opposite injection molding filling behavior between thermosets and thermoplastics through an effective and useful method. Specifically, there is strong slip between the thermoset melt and wall surface in thermoset injection molding, which is not found in thermoplastic materials. The study also investigated the variables that could lead to or influence the slip phenomenon of thermoset injection molding compounds, such as filler content, mold temperature, injection speed, and surface roughness. Microscopy was conducted to verify the correlation between mold wall slip and fiber orientation. The results of this study present challenges in the calculation, analysis, and simulation of mold filling behavior for highly glass fiber-reinforced thermoset resins in the injection molding process with consideration of wall slip boundary conditions.
Article
Materials Science, Composites
D. Schommer, M. Duhovic, T. Hoffmann, J. Ernst, K. Schladitz, A. Moghiseh, F. Gortner, J. Hausmann, P. Mitschang, K. Steiner
Summary: The ability to measure fiber orientation is crucial for process and part design in fiber reinforced polymers. A polarization camera system developed by the Fraunhofer Institute enables real-time measurement of the polarization state of light reflected from objects. This system is used to measure the surface fiber orientation in carbon fiber reinforced Sheet Molding Compound semi-finished products, providing quality control and digitalization of fiber orientation information in real-time.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Kousaku Tao, Koji Yamada, Seiji Higashi, Keitaro Kago, Shiho Kuwashiro, Hiroshi Hirano, Hiroki Takeshita, Katsuhisa Tokumitsu
Summary: This study investigated the impact of changing molding conditions on the physical aging of polystyrene injection moldings. It was found that the molecular orientation near the surface changed with changing injection rate, while the molecular orientation in the core layer changed with changing holding pressure. Additionally, increasing mold temperature reduced the molecular orientation in the core layer, leading to improved physical heat resistance.
INTERNATIONAL POLYMER PROCESSING
(2023)
Article
Polymer Science
Zhengyang Dong, Peng Zhao, Jianguo Zheng, Kaipeng Ji, Yuhong Chen, Jianzhong Fu
Summary: The proposed IGAO method utilizes batch information for self-learning without establishing a large number of experimental models, with fast convergence, 25% fewer steps, good stability, and is suitable for parameter optimization in batch processes.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Characterization & Testing
Peng Zhao, Yuhan Jia, Jun Xie, Tingyu Wang, Chenqian Zhang, Jianzhong Fu
Summary: A novel MagLev device using magnet arrays is proposed to replace the whole permanent magnet, providing a promising method for levitation of large-scale samples. The simulation results can obtain the equation between density and levitation height, showcasing the potential for accurate measurement of various polymer densities.
Article
Engineering, Electrical & Electronic
Xuechun Zhang, Hao Hu, Daofan Tang, Chengqian Zhang, Jianzhong Fu, Peng Zhao
Summary: A flexible tactile sensor based on the magnetic field was proposed in this study, which can linearly detect both force and position and perform quick tests in variable patterns. By introducing folding magnetization technology, higher magnetic flux density can be achieved and different sensor designs can be implemented.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Polymer Science
Ruoxiang Gao, Jun Xie, Jinghui Yang, Chaojie Zhuo, Jianzhong Fu, Peng Zhao
Summary: By conducting single factor experiments, the impact of raster angle and infill density on PEEK parts was determined, while orthogonal experiments were used to analyze the effects of printing speed, nozzle temperature, and other parameters. Through optimization, significant reductions in warpage deformation and improvements in tensile strength were achieved, supporting the development of FDM for PEEK.
Review
Chemistry, Multidisciplinary
Chenxin Lyu, Peng Zhao, Jun Xie, Shuyuan Dong, Jiawei Liu, Chengchen Rao, Jianzhong Fu
Summary: Nanofibrous membrane, especially those fabricated by electrospinning, is considered as an effective filter medium for particulate matter in air purification. These membranes exhibit good PM2.5 filtration performance and multi-functions, making them suitable for various applications against PM2.5 pollution.
Article
Engineering, Environmental
Chengqian Zhang, Daofan Tang, Mingyi Cao, Fu Gu, Xiangyu Cai, Xuetao Liu, Zhaoyu Cheng, Philip Hall, Jianzhong Fu, Peng Zhao
Summary: The MagLev configuration proposed in this study can separate substances with specific densities over 5.00 g/cm(3), showing great potential in heavy metal recycling by effectively separating different metal materials with high recovery rates and purities.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Materials Science, Composites
Ruoxiang Gao, Hao Chen, Zhezai Hu, Xuewen Cheng, Shiquan Gao, Shaohua Zhou, Peng Zhao
Summary: This study presents a novel method for predicting product strength by analyzing weld line and fiber orientation in injection molding, and successfully applies it to the gate design of an aerospace product. The results indicate that this method has great potential for mold design, product structure design, and process optimization.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Jinghui Yang, Jun Xie, Kaipeng Ji, Xianghong Wang, Xiaolong Jiao, Zhinong Xu, Peng Zhao
Summary: Microcellular PEEK with a weight reduction of 49.6% was prepared by mold-opening microcellular injection molding (MOMIM). Incremental holding time and holding pressure could increase PEEK's density and promote the formation of dense cells, improving mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Electrical & Electronic
Junye Huang, Peng Zhao, Chengqian Zhang, Jun Xie, Neng Xia, Jianzhong Fu
Summary: This article proposes a method to analyze the diamagnetic forces sustained by levitated pyrolytic graphite (PG) in order to investigate the mechanism of stable levitation. By dividing the PG disk into multiple regions, the resultant diamagnetic force can be determined, and the relationship between the size of the magnet and the disk and its ability of stable levitation is clarified.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Multidisciplinary
Chaojie Zhuo, Kaipeng Ji, Jun Xie, Xuewen Cheng, Xiaolong Jiao, Sheng Ye, Jianzhong Fu, Peng Zhao
Summary: This study proposes a non-intrusive ultrasonic measurement method based on minimum entropy blind deconvolution for measuring tie-bar stress in molding equipment. The results show that the method has high precision and low relative error. Compared to traditional methods, this approach does not require human intervention and helps achieve automation in stress measurement.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Mathematics, Applied
Kaipeng Ji, Peng Zhao, Xiaowei Zhou, Yuhong Chen, Zhengyang Dong, Jianguo Zheng, Jianzhong Fu, Huamin Zhou
Summary: This paper proposes a novel initialization method, UPPSO, for particle swarm optimization (PSO), which improves optimization performance by uniformly distributing particle positions and velocities in the response space. When applied to parameter estimation, UPPSO outperforms other algorithms in obtaining optimal parameters and exhibits competitive computational performance.
APPLIED MATHEMATICS AND COMPUTATION
(2022)
Article
Polymer Science
Xuemei Li, Fan Liu, Jun Xie, Chengqian Zhang, Ruoxiang Gao, Chenxin Lyu, Peng Zhao
Summary: This study aims to reduce the metallic impurities of parts and improve the wet processes environment. The impurities distribution of injection molds was examined, showing even distribution. The influence of process parameters on metallic contamination was investigated through orthogonal experiment, with injection rate having the greatest impact. By optimizing the process, the smallest metallic contamination of 1.077 μg/m² for PFA pipe joints was achieved, reducing by 56.3% compared with previous results. This research suggests that adjusting parameters is a feasible and effective method to reduce contamination during injection molding, providing another idea for improving cleanliness in chip manufacturing.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Zhengchuan Guo, Jun Xie, Chengqian Zhang, Ying Zheng, Liang Jin, Jinghui Yang, Peng Zhao
Summary: In this study, a post-treatment method was applied to enhance the tensile strength of PEEK fibers, generating up to a 69% increase. Optical measurements, uniaxial tensile tests, differential scanning calorimetry, and two-dimensional-wide angle X-ray diffraction were used to quantitatively investigate the effects of post-treatment process parameters on the diameter shrinkage ratio, mechanical properties, and aggregated state structure of PEEK fibers. The findings revealed that the improved fiber orientation, resulting from increased post-treatment temperature and constant tensile force, was the main factor contributing to the significant increase in uniaxial tensile strength. Moreover, mathematical models were developed to describe the linear relationship between the diameter shrinkage ratio and post-treatment temperature, as well as the uniaxial tensile strength and constant tensile force. These insights offer valuable guidance for enhancing the strength and controlling the morphology and mechanical properties of PEEK fibers during production.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhengchuan Guo, Jun Xie, Jinghui Yang, Jianzhong Fu, Peng Zhao
Summary: Polyether ether ketone (PEEK), a high-performance polymer, is widely used as an ideal metal replacement. This study introduces a rapid mold temperature rising technology based on induction heating, which effectively meets the requirements of rapid temperature increase and maintenance for PEEK injection molding. The experimental results show that compared to traditional electric heating, the induction heating method significantly improves the surface quality and mechanical properties of PEEK products, and it also shows adaptability to longer holding times for micro-open microporous injection molding, expanding the possibilities for developing higher performance PEEK foam products.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Optics
M. Munzer Alseed, Sajjad Rahmani Dabbagh, Peng Zhao, Oguzhan Ozcan, Savas Tasoglu
Summary: Magnetic levitation is a density-based technique that suspends objects using magnetic and gravitational forces. Recent advancements in portable smartphone-based MagLev setups have enabled applications in microparticle sorting, disease diagnosis, and other fields, making the technology more accessible and user-friendly.
ADVANCED OPTICAL TECHNOLOGIES
(2021)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.
