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Payne Effect and Weak Overshoot in Rubber Nanocomposites

Chinese Journal of Polymer Science 2022年第1期40卷 85-92页

作者： Zhi-Yun Li Yi-Hu Song Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude ***,Payne effect in diverse filled vulcanizates is investigated for generalizing the common *** curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix,revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler,crosslinking density and sol fraction of matrix and filler-rubber interfacial ***,carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous *** investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.

关键词： Vulcanizate nanocomposites Payne effect Weak overshoot

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synthesis of Poly[6-(2,6-bis(1＇-methylbenzimidazolyl)pyridin-4-yloxy)hexyl acrylate](PBIP) and Magnetic Property of Its Neodymium Complex(PBIP-Nd^(3＋))

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Chinese Journal of Polymer Science 2016年第7期34卷 910-917页

作者： di-zheng liu 孙维林 rong ren yan-hua wang zhi-quan shen MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Homopolymer（PBIP） containing 2,6-bis（1＇-methylbenzimidazolyl）pyridine（Me BIP） ligands in the side chain was synthesized by RAFT polymerization and its kinetics was studied. Polymeric complex PBIP-Nd^3＋ was prepared by chelating PBIP with lanthanide ion Nd^3＋. The homopolymers and PBIP-Nd^3＋ complex were investigated by NMR, FTIR, GPC and TGA. The optical property of PBIP-Nd^3＋ complex was characterized by UV-Vis spectroscopy. The magnetic property of PBIP-Nd^3＋ complex was measured as a function of temperature（5 K to 300 K） and as a function of field（-3.98×10^6 A/m to 3.98×10^6 A/m）. These results indicated that PBIP-Nd^3＋ complex is paramagnetic.

关键词： 2 6-Bis（1-methylbenzimidazolyl）pyridine Magnetic RAFT Polymeric complex Neodymium

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Fabrication of microcapsule arrays on chemically patterned surfaces via covalent linking

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第1期10卷 114-120页

作者： Jie YANG Chang-you GAO MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

A method for fabricating arrays of microcapsules covalently immobilized onto chemically patterned substrates was *** core-shell microparticles with poly(allylamine hydrochloride)(PAH) as the outermost layer were obtained by layer-by-layer (LbL) assembly,which were further treated with glutaraldehyde to endow the particles with abundant aldehyde groups on their *** particles were then covalently coupled to the chemically patterned regions with amino groups created by microcontact printing (μCP).After dissolution of the core particles,arrays of the hollow microcapsules with unchanged structures were *** arrays could stand rigorous environmental conditions of higher ionic strength,and lower and higher pH ***,the technique could be possibly applied to exploiting chips of microcontainers or microreactors in sensing technology.

关键词： Array Microcapsules Microcontact printing （μCP） Covalent interaction

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Influence of Liquid Isoprene Rubber on Strain Softening of Carbon Black Filled Isoprene Rubber Nanocomposites

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Chinese Journal of Polymer Science 2021年第7期39卷 887-895页

作者： Feng-Yi Hou Yi-Hu Song Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

The reinforcement of rubbers by nanoparticles is always accompanied with enhanced dissipation of mechanical energy upon large *** for solving the contradiction between improving reinforcement and reducing energy dissipation for rubber nanocomposites have not been well *** carbon black(CB)filled isoprene rubber(IR)/liquid isoprene rubber(LR)blend nanocomposites with similar crosslink density(ve)are prepared and influence of LR on the strain softening behaviors including Payne effect under large amplitude shear deformation and Mullins effect under cyclic uniaxial deformation is *** introduction of LR could improve the frequency sensitivity of loss modulus and reduce critical strain amplitude for Payne effect and loss modulus at the low ***,tuning ve and LR content allows reducing mechanical hysteresis in Mullins effect without significant impact on the mechanical *** investigation is illuminating for manufacturing nanocomposite vulcanizates with balanced mechanical hysteresis and reinforcement effect.

关键词： Rubber nanocomposites Stress softening Mechanical hysteresis Liquid rubber

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NANOFIBROUS MATS WITH BIRD'S NEST PATTERNS BY ELECTROSPINNING

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Chinese Journal of Polymer Science 2012年第1期30卷 130-137页

作者： Xiang-yu Ye Xiao-jun Huang Zhi-kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Electrospun material with bio-inspired ordered architectures and patterns is very interesting,yet remains a *** report here that nanofibrous mats with bird＇s nest patterned structures can be directly electrospun from chlorinated polypropylene solutions doped with an ionic *** solution viscosity and the ionic liquid content are two dominant factors to influence the topological morphology of the nanofibrous *** patterned structures can be further modulated by the collection time of electrospinning,the humidity of environment and the design of *** suggest the electrostatic repulsion between the residual charges of the mat surface and the upcoming nanofibers plays a key role in the formation of the bird＇s nest patterns.

关键词： Electrospinning Ionic liquid Patterned structures

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Recent Advances on Surface-modified Biomaterials Promoting Selective Adhesion and Directional Migration of Cells

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Chinese Journal of Polymer Science 2021年第7期39卷 815-823页

作者： Chen-Xi Tu Chang-You Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

The surfaces and interfaces of biomaterials interact with the biological systems in multi-scale levels,and thereby influence the biological functions and comprehensive performance in vitro and in *** particular,a surface promoting the selective adhesion and directional migration of desired types of cells in complex environment is extremely important in the repair and regeneration of tissues such as peripheral nerve and blood vessel,and long-term application of intracorporal devices such as intravascular ***,surface modification of biomaterials is a facile and effective method to achieve the desired cell-biomaterials *** this short review,recent advances on the surface modification of biomaterials to regulate selective cell adhesion and migration are briefly *** particular,the surface properties of biomaterials are manipulated via the convenient introduction of amino groups to the ester-based polymers,the formation of polyelectrolyte multilayers,and the fabrication of topology and gradient cues,etc.,followed by the association of chemical and biological signals such as collagen,heparin,hyaluronic acid,peptides and cell growth *** selective adhesion and directional migration of various types of cells such as endothelial cells(ECs),smooth muscle cells(SMCs),hepatocytes and Schwann cells(SCs)are achieved over the competitive counterpart cells by the use of cell-resisting substances and cell-selective motifs on gradient substrates in most *** advances on cell behaviors in three-dimensional(3D)ceH-extracellular matrix(ECM)-mimicking substrates are also reviewed.

关键词： Biomaterials Surface modification Gradient Cell migration Cell selectivity

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Water Soluble Amino Grafted Silicon Nanoparticles and Their Use in Polymer Solar Cells

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Chinese Journal of Polymer Science 2014年第4期32卷 395-401页

作者： Quan-xiang Yan Zhuo-wei Gu Qi Li Wei-fei Fu Xiao-qiang Chen Wen-qing Liu Hong-bin Pan Mang Wang 陈红征 State Key Lab of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang University

Stable aqueous amino-grafted silicon nanoparticles （SiNPs-NH2） were prepared via one-pot solution method. By grafting amino groups on the particle surface, the dispersion of SiNPs in water became very stable and clear aqueous solutions could be obtained. By incorporating SiNPs-NH2 into the hole transport layer of poly（3,4- ethylenedioxythiophene）/polystyrene sulfonic acid （PEDOT＇PSS）, the performance of polymer solar cells composed of poly[2-methoxy,5-（2＇-ethylhexyloxy）-1,4-phenylene vinylene] （MEH-PPV）：[6,6]-phenyl-C61-butyric acid methyl ester （PCBM） as active layer can be improved. SiNPs-NH2 are dispersed uniformly in the PEDOT：PSS solution and help form morphologies with small-sized domains in the PEDOT：PSS film. SiNPs-NH2 serve as screens between conducting polymer PEDOT and ionomer PSS to improve the phase separation and charge transport of the hole transport layer. As a result, the sheet resistance of PEDOT：PSS thin films is decreased from （93 ±5） × 10^5 to （13 ± 3） × 10^5 Ω/□. The power conversion efficiency （PCE） of polymer solar cells was thus improved by 9.8% for devices fabricated with PEDOT＇PSS containing 1 wt% of SiNPs-NH2, compared with the devices fabricated by original PEDOT：PSS.

关键词： SiNPs-NH2 Water-soluble Phase separation Polymer solar cells Transport.

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Thermo-sensitive Poly(DEGMMA-co-MEA) Microgels: synthesis, Characterization and Interfacial Interaction with Adsorbed Protein Layer

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Chinese Journal of Polymer Science 2015年第11期33卷 1516-1526页

作者： Zhen-bing Li Yan-hui Xiang Xian-jing Zhou Jing-jing Nie Mao Peng 杜滨阳 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science & EngineeringZhejiang University Department of Chemistry Zhejiang University

The novel microgels, poly[di（ethylene glycol） methyl ether methacrylate-co-2-methoxyethyl acrylate] poly（DEGMMA-co-MEA） microgels, were synthesized. The poly（DEGMMA-co-MEA） microgels were thermo-sensitive and exhibited a volume phase transitive temperature（VPTT） of 14–22 ℃. The incorporation of hydrophobic comonomer MEA shifted the VPTT of poly（DEGMMA-co-MEA） microgels to lower temperatures. The interfacial interaction of poly（DEGMMA-co-MEA） microgels and three model proteins, namely fibrinogen, bovine serum albumin and lysozyme, was investigated by quartz crystal microbalance（QCM）. An injection sequence of ＂microgel-after-protein＂ was then established for the real-time study of the interaction of proteins and the microgels at their swollen and collapsed states by using QCM technique. The results indicated that the interfacial interaction of poly（DEGMMA-co-MEA） microgels and adsorbed protein layers was mainly determined by the electrostatic interaction. Because poly（DEGMMA-co-MEA） microgels were negatively charged in Tris-HCl buffer solution（pH = 7.4）, the microgels did not adsorb on negatively charged fibrinogen and bovine serum albumin layers but strongly adsorbed on positively charged lysozyme layer. Stronger interaction between lysozyme and the microgels at collapsed state（i.e. at 37 ℃） was observed. Furthermore, the incorporation of MEA might weaken the interaction between poly（DEGMMA-co-MEA） microgels and proteins.

关键词： QCM Poly（DEGMMA-co-MEA） microgels Thermosensitive Proteins Interfacial interaction

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Enhance efferocytosis capacity of dendritic cells for diabetic wound healing by nanozyme-loaded nanofiber dressings

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Nano Today 2025年 64卷

作者： Jian, Danfeng Ye, Kai Wang, Limo Jin, Lulu Yang, Huang Ma, Lie Yi, Chenggang Mao, Zhengwei Wu, Jindan MOE Key Laboratory of Advanced Textile Materials & Manufacturing Technology Zhejiang Sci-Tech University Hangzhou310018 China Department of Plastic Surgery The Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou310003 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310003 China Department of Hepatobiliary and Pancreatic Surgery The Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou310003 China Key Laboratory of Precision Diagnosis and Treatment for Hepatobiliary and Pancreatic Tumor of Zhejiang Province Zhejiang Hangzhou310009 China

Improving efferocytosis of dendritic cells (DCs) by inhibiting membrane transporter protein SLC7A11 has been explored for healing diabetes wounds. However, the administration of SLC7A11 inhibitors has been linked to the generation of reactive oxygen species (ROS), which may compromise the viability and functionality of DCs. To mitigate this adverse effect, a nanozyme-loaded nanofiber dressing, termed GIPH, was developed. This dressing encapsulates a specific SLC7A11 inhibitor (HG106) in the core layer and incorporates an efficient nanozyme, Ir NPs-PVP, in the shell layer. The Ir NPs-PVP nanozyme effectively neutralizes ROS produced by HG106, thereby enhancing the viability of DCs and further promoting their efferocytosis. Our in vitro experiment results demonstrated that GIPH-treated Bone Marrow-Derived Dendritic Cells (BMDCs) exhibited a 1.68-fold increase in survival and a 1.52-fold enhancement in efferocytosis rate compared to those treated with HG106 alone. Furthermore, in a diabetic mouse wound model, the GIPH group showed superior healing outcomes, with wound nearly achieving complete recovery by day 12 (97.5 %). This research highlights the therapeutic potential of nanozyme-loaded nanofiber dressings while providing valuable insights for future investigations into the DCs-mediated wound healing process. © 2025 Elsevier Ltd

关键词： Nanofibers

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Wet-spun poly(ionic liquid)-graphene hybrid fibers for high performance all-solid-state flexible supercapacitors

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Journal of Energy Chemistry 2019年第7期28卷 104-110页

作者： Karthikeyan Gopalsamy Qiuyan Yang Shengying Cai Tieqi Huang Zhengguo Gao Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province Zhejiang University

It is crucial to develop flexible and wearable electronic devices that have attracted tremendous interest due to their merits on compactness,flexibility and high capacitive *** we report the continuously ordered macroscopic poly(ionic liquid)-graphene fibers by wet spinning method via liquid crystal assembly for supercapacitor *** fabricated all-solid-state supercapacitors exhibited a high areal capacitance(268.2 mF cm 2)and volumetric capacitance(204.6 F cm 3)with an outstanding areal energy density(9.31μWh cm-2)and volumetric energy density(8.28 mWh cm-3).The fiber supercapacitors demonstrated exceptional cycle life for straight electrodes of about 10,000 cycles(94.2%capacitance retention)and flexibility at different angles(0°,45°,90°,180°)along with a good flexible cycling stability after 6000 cycles(92.7%capacitance retention).To date,such a novel poly(ionic liquid)-graphene fiber supercapacitors would be a new platform in real-time flexible electronics.

关键词： Graphene fiber Poly(ionic liquid) Wet spinning Supercapacitors Flexibility

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