Article
Agricultural Engineering
Bailiang Xue, Rui Tang, Danwei Xue, Ying Guan, Yongchang Sun, Wei Zhao, Jiaojun Tan, Xinping Li
Summary: In this study, high mechanical strength and lignin replacement rate of lignin-based epoxy vitrimers were successfully synthesized. These vitrimers exhibit excellent properties such as self-healing, reprocessing, and shape memory, suggesting their potential as renewable alternatives to bisphenol A epoxy vitrimers.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Polymer Science
Panuwat Luengrojanakul, Phattharin Mora, Kittipon Bunyanuwat, Chanchira Jubsilp, Sarawut Rimdusit
Summary: Shape-memory carbon fiber polymer composites reinforced with graphene nanoplatelets were prepared and their performance was analyzed. The results showed that the addition of the nanoplatelets improved the strength, modulus, and shape-memory effect of the composites. However, at higher fiber mass fractions, the performance decreased.
Article
Materials Science, Composites
Mohammad Amini, Shuying Wu
Summary: A polymer blend nanocomposite incorporating nanohydroxyapatite (nHA) exhibited triple-shape memory behavior, with improved thermal stability and storage modulus. However, excess nHA content led to aggregation in the polymers and decreased shape recovery ratio. Increasing thermomechanical cycles had a significant effect on shape memory behavior, showing a synergistic effect with the addition of nanofiller.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Aerospace
Debby Margoy, Irina Gouzman, Eitan Grossman, Asaf Bolker, Noam Eliaz, Ronen Verker
Summary: Shape memory polymers have the ability to recover their permanent shape and are suitable for deployable devices in spacecraft. However, the impact of vacuum environment on their deployment has not been thoroughly studied. This work introduces a method to improve energetic efficiency and a motion sensing technique for shape memory polymer actuators.
Article
Chemistry, Applied
Rauf Mahmudzade, Peyman Nikaeen, William Chirdon, Ahmed Khattab, Dilip Depan
Summary: UV exposure results in an increase in the number and dimension of microcracks on the surface of shape memory polymers, while also increasing the glass transition temperature of the polymer. After 600 hours of UV radiation, the elastic modulus and hardness of the polymer increased by approximately 22% and 33%, respectively.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Applied
Rauf Mahmudzade, Peyman Nikaeen, William Chirdon, Ahmed Khattab, Dilip Depan
Summary: Shape memory polymers have great potential in aviation and biomedical industries, but their full utilization is limited by the lack of understanding of their environmental degradation mechanisms. This study investigates the effects of UV-induced aging on the chemical structure, thermo-mechanical, morphological, and optical properties of an epoxy-based shape memory polymer, providing insights into the changes that occur during degradation.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Multidisciplinary
Jie Wang, Yugang Duan, Ben Wang, Yao Qi, Qian He, Hong Xiao, Yatao Zhao, Yansong Zhu, Yueke Ming, Feng Wang
Summary: This study utilized CF/Ts-SMP 4D printing technology to enhance the mechanical load bearing properties and shape memory functions of printed materials by adjusting the cross-linking degree, achieving superior overall mechanical and shape memory properties.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Polymer Science
Long Chen, Yeqin Shen, Zhanqiang Liu, Qinghua Song, Yanyan Jiang
Summary: In this study, the thermodynamic effect of shape memory graphene oxide/epoxy resin composites with different fractions of graphene oxide (GO) was investigated using molecular dynamics (MD) simulations and shape memory performance experiments. The MD simulations revealed that the chemical bonds between the GO layer and the epoxy resin molecule were crucial for improving the shape memory performance. Additionally, it was found that the agglomeration of GO particles reduced the recovery performance of the shape memory composites.
Article
Polymer Science
Guangqin Shi, Cheng Huang, Xinyu Cao, Minying Liu, Jingnan Zhang, Kun Zheng, Yongmei Ma
Summary: A triple-shape memory polymer was prepared by chemically crosslinking melting blending of ethylene-vinyl acetate copolymer (EVA) and poly(propylene carbonate) (PPC), showing excellent triple shape memory effects with shape fixing ratio and shape recovery ratio both over 90%. The key to achieving triple SME is the matching of the modulus of the two components, with the glassy PPC having a higher modulus than the semi-crystalline EVA.
Article
Chemistry, Applied
Yuji Shibasaki, Ryoji Kudo, Tadashi Tsukamoto, Yoshiyuki Oishi
Summary: Crosslinkable polyether-b-amides (XPEBA) were successfully prepared with good shape memory properties by controlling the mechanical properties of cured XPEBA films through changing the PEO/PPO ratio.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Polymer Science
Lu Lu Taung Mai, Min Min Aung, Sarah Anis Muhamad Saidi, Paik San H'ng, Marwah Rayung, Adila Mohamad Jaafar
Summary: The study focuses on the use of jatropha oil to prepare epoxidized jatropha oil (EJO) and subsequently a shape memory polymer (SMP), showing that the resulting bio-based polymer has soft and flexible properties, good thermal stability, and shape recovery properties.
Article
Biochemistry & Molecular Biology
Yang Feng, Zhuguang Nie, Panhong Deng, Liping Luo, Xingman Hu, Jie Su, Haiming Li, Xiaodong Fan, Shuhua Qi
Summary: An effective method of using polydopamine coating to improve the interfacial interaction between Mutiwalled carbon nanotubes (MWCNTs) and epoxy matrix has been developed. This method enhances the performance of the epoxy vitrimer in terms of thermal conductivity, strength, shape memory, repairing, and recycling.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Denise Bellisario, Fabrizio Quadrini, Leandro Iorio, Loredana Santo, Zhenxue Zhang, Xiaoying Li, Hanshan Dong, Dionisis Semitekolos, Georgios Konstantopoulos, Costas A. Charitidis
Summary: Microscopic testing has been conducted on shape memory polymer composites (SMPCs) manufactured with commercial materials used in aerospace. The results were compared with conventional macro-scale tests. Different SMPC laminates were studied to evaluate their lightweight and stiff sandwich structures with shape memory properties. The recovery mechanisms at the micro-scale were identified and found to affect the shape memory performances at the macro-scale.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Polymer Science
Zhihua Li, Yu Yang, Li Ma, Hongxin Liu, Xin Zhang
Summary: In this study, a binary shape memory epoxy resin system was developed and applied to carbon fiber reinforced shape memory composites. It was found that the addition of diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate epoxy resin significantly improved the glass transition temperature, tensile strength, and Young's modulus of the composites, while reducing the impact strength. The shape memory composites exhibited good shape fixity and recovery ratios after 30 cycles, and showed excellent mechanical properties compared to neat shape memory epoxy resin.
Article
Engineering, Environmental
Jiangan You, Zhiwei Jiang, Hanqing Jiang, Jian Qiu, Minggang Li, Haiping Xing, Jian Xue, Tao Tang
Summary: A novel plasticizing-foaming-reinforcing (PFR) strategy was established for preparing reprocessable thermoplastic/thermoset blend foams. The resulting PVC/polyurea blend foam exhibited excellent thermal insulation performance, mechanical robustness, flexible molding ability, and shape memory behavior.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Ozgur Kutlug, Stephan Reck, Andreas Hartwig
JOURNAL OF APPLIED POLYMER SCIENCE
(2018)
Article
Chemistry, Physical
Oezguer Kutlug, Roland Hass, Stephan Reck, Andreas Hartwig
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2018)
Article
Chemistry, Applied
Sebastian Stoesslein, Ingo Grunwald, Johannes Stelten, Andreas Hartwig
CARBOHYDRATE POLYMERS
(2019)
Article
Polymer Science
Artur Kochanke, Christoph Uffing, Andreas Hartwig
POLYMER DEGRADATION AND STABILITY
(2019)
Article
Polymer Science
Sebastian Stoesslein, Ingo Grunwald, Alexander Khachikyan, Fabian Fassbender, Karsten Thiel, Andreas Hartwig
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2019)
Article
Chemistry, Physical
Artur Kochanke, Christoph Ueffing, Andreas Hartwig
SURFACE AND INTERFACE ANALYSIS
(2019)
Review
Chemistry, Physical
Kai O. Boeker, Katharina Richter, Katharina Jaeckle, Shahed Taheri, Ingo Grunwald, Kai Borcherding, Janek von Byern, Andreas Hartwig, Britt Wildemann, Arndt F. Schilling, Wolfgang Lehmann
Article
Chemistry, Inorganic & Nuclear
Saurav Bhattacharya, Wassim W. Ayass, Dereje H. Taffa, Talha Nisar, Torsten Balster, Andreas Hartwig, Veit Wagner, Michael Wark, Ulrich Kortz
INORGANIC CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
Ron Hoffmann, Hendrik Naatz, Andreas Hartwig
Summary: The properties of nanoparticle-polymer composites are strongly influenced by the network structure of the polymer matrix. Introducing ITO nanoparticles as a scaffold can alter the reaction rates and degree of conversion during polymerization processes.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Max Lallemang, Leixiao Yu, Wanhao Cai, Klaus Rischka, Andreas Hartwig, Rainer Haag, Thorsten Hugel, Bizan N. Balzer
Summary: This study investigates the strength and characteristics of multivalent interactions at the molecular level using AFM technology, and finds that under certain conditions, non-covalent bonds, such as coordination bonds, can exhibit higher multivalent bond strength, even surpassing strong covalent bonds. Additionally, covalent bonds enhance the density of the multifunctional polymer layer, particularly increasing the number of non-covalent bonds.
Article
Polymer Science
Thorben Soeren Haubold, Andreas Hartwig, Katharina Koschek
Summary: DOPO-based flame-retardant additives with different numbers of phenolic hydroxyl groups and amine groups were synthesized and their influence on the polymerization of a bisphenol F-based benzoxazine and the thermal properties of the resulting materials were studied. It was found that all DOPO-based derivatives lowered the polymerization temperature while maintaining high thermo-mechanical properties. Surprisingly, a phosphorous content below 0.4 wt% significantly improved the reaction against small flames, resulting in an increase in the limited oxygen index and a V-0 rating in the UL-94 test. DOPO-HQ was found to be the most effective additive for reaction against small flames at a phosphorous concentration below 0.1 wt%, while DOPO-AP and DOPO-Van simultaneously lowered the polymerization temperature.
Article
Polymer Science
Niklas Neumann, Sascha Thinius, Gideon Abels, Andreas Hartwig, Katharina Koschek, Laura Boskamp
Summary: A synthesis approach was investigated for crosslinkable hyperbranched prepolymers with adjustable degrees of methylation and methacrylation, achieving full conversion of hydroxyl groups. The substitution degrees of methacrylate could be adjusted by catalyzed esterification using predefined partially methylated polyglycerol-based precursors. The combination of methacrylic anhydride, triethylamine, and 4-dimethylaminopyridine was proven effective for complete conversion of primary and secondary hydroxyl groups. NMR, IR, and Raman spectroscopy confirmed the insertion of methacrylic crosslinking groups in the polymeric backbone. The photopolymerization of obtained prepolymers resulted in higher crosslink density, stiffness, and glass transition temperature with increasing methacrylate content.
Article
Materials Science, Multidisciplinary
Vitus Hupp, Bernhard Schartel, Kerstin Flothmeier, Andreas Hartwig
Summary: This paper investigates the interaction between adhesive tapes and bonded materials during burning and the impact of flame retardancy on the burning behavior of adhesive tapes. It shows that the choice of carrier and substrates in bonds has the greatest influence on fire properties, changing the peak of heat release rate and the maximum average rate of heat emission by up to 25%.
FIRE AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kyriakos Karakyriazis, Vanessa Luehrs, Sebastian Stoesslein, Ingo Grunwald, Andreas Hartwig
Summary: Schiff base hydrogels have gained attention in the field of biomedical applications due to their reversible imine bonds and degradation properties. Commonly used multifunctional amines with low water solubility include bovine serum albumin and chitosan. Glutaric aldehyde, a toxic substance, is often used for Schiff base formation. In this study, a two-component Schiff-base-crosslinked hydrogel based on aminoterminated hyperbranched polyglycerol (hPG-NH2) and polyethyleneglycol dialdehyde (PEG-DA) was developed, showing promising mechanical properties. The hydrogels' mechanical properties were characterized using a texture analyzer, investigating the impact of solid content, component ratio, and pH on gel properties.
MATERIALS ADVANCES
(2023)
Article
Nanoscience & Nanotechnology
Ron Hoffmann, Valentin Baric, Hendrik Naatz, Sven O. Schopf, Lutz Maedler, Andreas Hartwig
ACS APPLIED NANO MATERIALS
(2019)
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.
