Article
Materials Science, Paper & Wood
Abdelhaq Benkaddour, Mohamed Lahcini, Redouane Beniazza
Summary: The Taguchi design was used to investigate the effects of five factors on the mechanical properties of CNC-reinforced PA6 thin films. CNC loading was found to have the most significant influence on Young's modulus and tensile strength. Optimum parameters were determined as CNC loading 1wt%, solution concentration 10wt/v%, first sonication time 30 min, second sonication time 60 min, and rotation speed 5000 rpm. SEM, TEM, and DSC were performed to confirm the results and understand the effects of CNC loading on crystallinity and mechanical properties.
Article
Engineering, Manufacturing
Feng-Ming He, Bo-Wen Liu, Li Chen, De-Ming Guo, Xiao-Min Ding, Yan-Fang Xiao, Hai-Bo Zhao, Wen-Da Li, Yu-Zhong Wang
Summary: Two Schiff-base containing phosphonate oligomers, PSA and POSC, were designed as novel flame retardants for PA 6, achieving improved flame retardancy without sacrificing mechanical properties. The different flame-retardant mechanisms of these two additives were comprehensively studied, leading to the development of efficient flame-retardant polyamide composites with excellent performance.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Yufei Liu, Yikai Zhan, Min He, Chengjun Xiao, Shan Liu, Shuhao Qin, Jie Yu
Summary: Polyamines with different amino numbers were grafted onto the surface of carbon fiber to improve the interfacial properties and mechanical properties of carbon fiber/polyamide 6 composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Multidisciplinary Sciences
Gyorgy Czel, Anna Sycheva, Dora Janovszky
Summary: The influence of different fillers on the thermal and abrasive wear properties of polyamide-6 was investigated. Fillers such as Al2O3, MgO, glass powders, and natural zeolite powder were added to the polymer matrix. The results showed that the thermal conductive enhancement factor was highest for PA6/70 wt% Al2O3 and PA6/hybrid fillers 75 wt%. The abrasive effect of the fillers was characterized using the pin-on-disc method, and a new parameter considering both thermal conductivity and abrasive effect was developed.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Composites
Chunhua Wang, Yingwei Zhang, Yong Yi, Dengwang Lai, Jun Yang, Wenzhi Wang
Summary: Star-branched polyamide 6/glass fiber composites, using star-branched polyamide 6 as the matrix resin and glass fiber as the reinforcing material, exhibit excellent processability and mechanical properties even at high GF content.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Hideyuki Uematsu, Shunya Nishimura, Ayaka Yamaguchi, Fumihiro Nishimura, Shinji Sugihara, Naoki Sugiura, Takeshi Ishikawa, Takahiro Hayashi, Masachika Yamane, Kazumasa Kawabe, Yukihiro Ozaki, Shuichi Tanoue
Summary: This study investigates the influence of polyamide 6 (PA6) crystal structure on the mechanical properties of CF-reinforced PA6 composites. The transverse tensile properties of unidirectional composites and the four-point bending properties of quasi-isotropic composites were measured using three types of CFs. The results show that a higher content of alpha-crystal at the interphase contributes to increased tensile strength, and small variations in crystal structure distribution around CFs enhance the flexural strength. The findings provide insights into the superior properties of CFs in PA6/CF composites.
Article
Chemistry, Applied
Xiaolian Niu, Longfei Wang, Mengjie Xu, Miao Qin, Liqin Zhao, Yan Wei, Yinchun Hu, Xiaojie Lian, Ziwei Liang, Song Chen, Weiyi Chen, Di Huang
Summary: The novel PA6/CS@n-HA/PA6 bilayered tissue guided membranes show good physical and mechanical properties, biological compatibility, and osteoconductivity. Through a series of tests, it is confirmed that the membranes have good porosity and bioactivity.
CARBOHYDRATE POLYMERS
(2021)
Article
Polymer Science
Zhe Wang, Na Lin, Hongliang Kang, Xinmin Hao, Ruigang Liu
Summary: The miscibility, crystallization behaviors, and morphology of polyamide 56/polyamide 6 (PA56/PA6) blends were studied. The results showed that PA56 and PA6 were miscible in the blends, evident from the presence of only one glass transition temperature (Tg). The interaction between PA56 and PA6 in the blends led to a depression in the melting point, crystallization temperature, and crystallinity of the blends. Both PA56 and PA6 maintained their crystalline structure and crystallized separately in both isothermal and non-isothermal crystallization processes. PA56 crystallized in all blending ratios, while PA6 only crystallized with a PA6 content of phi 6 > 0.2. The crystals of PA56 and PA6 grew in the same crystal skeleton but in different layers. The addition of a small amount of PA6 in PA56 significantly improved the elongation at break without sacrificing the strength, indicating a promising approach for fabricating polyamide materials with desired properties.
Article
Nanoscience & Nanotechnology
Hongyu Lu, Deqi Yi, Haisheng Feng, Boyou Hou, Jianwei Hao
Summary: In this study, the influence of crystal structure difference of melamine trimetaphosphate (MAP) on the application performance of its polymer composites was explored. An intumescent flame retardant with the optimal crystal type, I-MAP and II-MAP, was synthesized and used to improve the mechanical properties and flame retardancy of polyamide 6 (PA6). The comprehensive characterization of morphology, chemical composition, and thermal stability was conducted, and the dispersion, mechanical properties, and flame retardancy of PA6/I-MAP and PA6/II-MAP were evaluated. The results showed that PA6/II-MAP exhibited significantly improved tensile strength, flame rating, and PHRR compared to PA6/I-MAP.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Li Chen, Ben Huang, Feng Wei, Xiao Guo, Dandan Zhang, Kunyapat Thummavichai, Ding Chen, Nannan Wang, Yanqiu Zhu
Summary: This study successfully synthesized MXene on the surface of a metal-organic framework and incorporated it into a polyamide 12 composite. The resulting composite exhibited improved mechanical strength and fire safety properties. The findings shed light on the underlying mechanism behind the enhancement of mechanical and flame-retardant properties by MXene.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Karol Bula, Bartosz Korzeniewski
Summary: This research aimed to enhance the adhesion between polyamide 6 (filled with glass fiber) and aluminum using low-power laser treatment. Micro-patterns were prepared on aluminum sheets using a fiber laser beam, and metallic inserts were overmolded in various configurations. The results showed that a significant recast melt was formed at the lowest laser speed, leading to the highest roughness parameter value.
Article
Polymer Science
Huiyu Wang, Xianggong Zhang, Guangyong Liu
Summary: Polyamide elastomer (PAE) was found to significantly increase the overall crosslink density of NBR/PAE vulcanizate. During the aging stage, the overall crosslink density initially increased and then decreased with increasing aging temperature. There was a linear relationship between the tensile strength and the overall crosslink density of the vulcanizate. Increasing the PAE content improved the oil resistance of the vulcanizate.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Composites
Haoran Liao, Tao Yu, Yan Li
Summary: GO/PA6 nanocomposites with different graphene content were prepared via in situ polymerization, and their rheological properties and thixotropy were studied using rheological methods.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Applied
Liang Yi, Qian Yang, Long Yan, Ning Wang
Summary: A series of organophosphate-grafted nano-TiO2 was synthesized and used in coatings to obtain multifunctional transparent fire-retardant coatings with superior fire resistance, antibacterial, and anti-aging properties.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Polymer Science
Milo Gardeniers, Mohanraj Mani, Ele de Boer, Daniel Hermida-Merino, Robert Graf, Sanjay Rastogi, Jules A. W. Harings
Summary: This article investigates the influence of superheated water on the structural refinement of polyamide 6 and finds that it can enhance the thermomechanical performance of polyamide 6. Based on the experimental results, the pseudo-hexagonal phase of polyamide 6 can dissolve at a relatively low temperature in superheated water and crystallize into a defected monoclinic phase, which then refines to a perfected monoclinic structure. Additionally, the removal of water leads to the preservation of the most thermodynamically stable crystallographic phase, resulting in increased mechanical properties and dimensional stability of the product.
Article
Polymer Science
Boqiong Xue, Yuchun Li, Jia Guo, Jun Sun, Xiaodong Liu, Hongfei Li, Xiaoyu Gu, Sheng Zhang, Shengling Jiang, Zhiyuan Zhang
Summary: The integrated-functional additive of DOPO-MWCNTs in PA6 improved flame retardancy and antistatic properties significantly by forming an electric network and controlling severe dripping during burning. The network strengthened char structure and reduced heat and smoke release, with CO release cut by about half in CONE test.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Qingxia Xue, Quan Wu, Yuan Yao, Xinjian Li, Jun Sun, Xiaoyu Gu, Weiguo Song, Fang Yan, Sheng Zhang
Summary: An efficient bio-safe cyclophosphazene flame retardant HCPO was synthesized and incorporated into PLA to enhance fire safety. Results showed that HCPO significantly improved the flame retardancy of PLA composites.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Polymer Science
Sheng Zhang, Yichong Jiang, Yongyuan Sun, Jun Sun, Bo Xu, Hongfei Li, Xiaoyu Gu
Summary: The combination of functionalized multi-walled carbon nanotubes with graphite sheets can effectively improve the performance of epoxy resin composites, including mechanical properties, flame retardancy, and conductivity. Adding carbon nanomaterials can significantly enhance the mechanical properties and flame retardancy of epoxy resin.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Enxia Guo, Bo Tang, Shuheng Wang, Weihua Feng, Xingguo Wang, Jun Sun, Sheng Zhang, Xiaoyu Gu, Hongfei Li
Summary: The integrated intumescent flame retardant (IFR) fabricated by linking sodium tri-polyphosphate (STPP) and melamine (MEL) significantly improved the performance of the butyl acrylate (BA) coating, reducing water absorption and increasing oxygen index when adding 10 wt% of MTP.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Polymer Science
Chenchen Gao, Ting Yu, Jun Sun, Xiaoyu Gu, Hongfei Li, Chenzhong Mu, Sheng Zhang
Summary: By introducing a phosphoric acid modified triazine covalent organic framework (PCOF), a novel epoxy resin (EP) composite with satisfactory fire performance and mechanical properties was successfully synthesized. The addition of PCOF significantly improved the flame retardant effect of EP composite and exhibited excellent water resistance.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Polymer Science
Jingfan Zhang, Huqun Wang, Wenxiang Sun, Zhiyuan Zhang, Hongfei Li, Sheng Zhang, Jun Sun, Xiaoyu Gu
Summary: Coating graphene oxide and melamine formaldehyde on ammonium polyphosphate can enhance the flame retardant efficiency significantly, reducing dripping during burning and achieving a higher char residue. The integrated intumescent flame retardant mechanism involves heat transfer and cross-linking of decomposed products, resulting in compact char formation.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Polymer Science
Yufan Yang, Xingguo Wang, Bin Fei, Hongfei Li, Xiaoyu Gu, Jun Sun, Sheng Zhang
Summary: This study significantly improved the flame retardancy of PLA nonwovens by introducing a novel eco-friendly flame retardant called TPA, which increased LOI value, decreased heat release rates, enhanced char-forming capability, and demonstrated the advantage of PLA/TPA composite materials in flame retardancy.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Huihui Liu, Shuheng Wang, Jun Sun, Xiaoyu Gu, Hongfei Li, Sheng Zhang
Summary: By integrating red phosphorus and surface decorated magnesium hydroxide compound silicone resin (CCSi@MH) into EVA, this study successfully achieved effective suppression of combustion, elimination of dripping behavior, and improvement of mechanical properties.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Polymer Science
Qinyong Liu, Huawei Wang, Hefu Li, Jun Sun, Xiaoyu Gu, Sheng Zhang
Summary: A novel flame retardant ZIF-67@GO was developed to enhance the flame retardancy and smoke suppression of thermoplastic polyurethane (TPU). The presence of this flame retardant significantly improved the flame retardancy of TPU, with increased limit oxygen index (LOI) and reduced heat release rate and smoke production rate. The flame-retardant TPU also exhibited satisfactory mechanical properties for industrial applications.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Polymer Science
Jingfan Zhang, Dong Chen, Qiaoling Chen, Tao Zhu, Hongfei Li, Jun Sun, Wantai Yang, Xiaoyu Gu, Sheng Zhang
Summary: In this study, a rigid microsphere divinylbenzene-maleic anhydride (DM) copolymer was used as a synergistic agent with intumescent flame retardant (IFR) to improve the flame retardancy, mechanical properties, and degradation rate of P34HB.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Materials Science, Multidisciplinary
Yifang Hua, Jun Sun, Shengling Jiang, Xiaoyu Gu, Sheng Zhang
Summary: This study successfully improved the flame retardancy and mechanical properties of epoxy resin by introducing DOPO-SGA. The addition of DOPO-SGA increased the LOI of epoxy resin to 33.2%, achieved a UL-94 rating of V-0, and reduced smoke and heat release. Moreover, the tensile strength and impact strength were also enhanced.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Polymer Science
Yifang Hua, Jinxuan Chen, Jian Liu, Jun Sun, Xiaoyu Gu, Shengling Jiang, Sheng Zhang
Summary: A flame retardant (DPPVA) was synthesized through a Schiff-base reaction, and it improved the thermal stability, flame retardancy, and antibacterial activity of the cured epoxy resin (EP). The EP/4% DPPVA sample showed good results in terms of flame retardancy, with reduced heat release rate, smoke production, and increased char residue. Additionally, it exhibited effective repellence to bacteria. The addition of 4% DPPVA to EP slightly decreased the impact strength, but it was still acceptable for industrial scenarios.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Materials Science, Multidisciplinary
Jingjing Yang, Yifang Hua, Jun Sun, Xianming Wang, Xiaoyu Gu, Sheng Zhang
Summary: By synthesizing and introducing a high-effective boron-containing flame retardant PBMA-APP, the fire resistance and impact toughness of epoxy resin are significantly improved without compromising its tensile strength.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Dan Meng, Weiwen Gu, Guiyang Zhu, Jun Sun, Haiqiao Wang, Fenquan Nie, Xiaoyu Gu, Pengyu Bi, Sheng Zhang
Summary: In this study, a hyperbranched flame retardant (HPNP) containing nitrogen and phosphorus was successfully synthesized and its distribution and enhancement effect on flame retardancy in flexible polyurethane foam (FPUF) were demonstrated through simulation and experiments. Additionally, the improved compatibility and mechanical properties of FPUF with HPNP were observed, indicating its potential as an ideal flame retardant additive.
COMPOSITES PART B-ENGINEERING
(2023)
