最新刊期
卷 27 ， 期 5 ， 2014
- 摘要：Rolling resistance (RR),wet skid resistance (WSR) and wear resistance (WR) are the most important properties for the tires, while they are conflicting criteria in designing the tire tread composites, and so improving the above three properties at the same time is still a challenge to the tread composites. In this paper,from the viewpoint of viscoelasticity of the rubber composites, the effects of filler network structure and filler-rubber interaction on RR, WSR and WR and their mechanism are reviewed. By the methods of rubber molecule structure optimization and filler modification, decreasing the filler network structure and enhancing the filler-rubber interaction can improve the overall performance of the tire tread composites.关键词：Tire tread composite;Rolling resistance;Wet skid resistance;Wear resistance
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发布时间：2022-09-18 - 摘要：Specific Fluoroelastomers are grades of fluoroelastomer with special properties and elements such as P,N,O in their polymeric structures, which differ from universal fluoroelastomers, for instance,Fluoroelastomer -23 (copolymer of VDF and CTFE),Fluoroelastomer -26 (copolymer of VDF and HFP),Fluoroelastomer - 246 (copolymer of terpolymer of VDF、TFE and HFP),and so on. This article reviews processes of development and research advances for specific fluoroelastermos in China and at the same time,introduces several synergistic methods,basic properties and application field of several types of homemade Specific Fluoroelastomers.关键词：Fluoroelastomers;Perfluoroelastomers;Carboxylnitroso flourorubber;Phosphonitrile fluororubber;Fluorosilicones
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发布时间：2022-09-18 - 摘要：Filled rubber is a type of multi-phase composite reinforced by nanoparticles. The coexistence of the rubber crosslinks and the secondary network formed by nanoparticles leads to extremely complicated mechanical behaviors like large deformation visco-hyperelastic, dynamical stress softening, self-heating effects etc. How to describe these behaviors using a reasonable constitutive model is a popular and challenge subject for rubber researchers. In recent years the advancement of the simulation technology makes strong requirements for the reliability,accuracy and numerical stability of rubber constitutive model. This paper presents a review of the state of the art rubber constitutive models,especially with regard to the research progresses on hyperelastic, viscoelastic and rheological models. Furthermore, from the perspective of the numerical compatibility between FEA method and rubber constitutive model application, this paper discusses the precision,application range and parameterization of some commonly used rubber constitutive models,which provides guidance to rubber mechanical simulation. Moreover,the challenge and directions for the current rubber constitutive model research has been explored.关键词：Filled rubber;Constitutive model;Rheology;Viscoelasticity;Hyperelasticity
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发布时间：2022-09-18 - 摘要：In the last decade, many new rubber nanocomposite systems emerge. Comparing with more traditional systems, these new rubber nanocomposite systems exhibit design flexibility, new performance, especially various functional performance. This article reviews the new developments in designs and processing methods for rubber nanocomposites. Based on current status,the authors emphasize some valuable directions for rubber nanocomposites.关键词：Rubber;Nanocomposite;Design;Processing method
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发布时间：2022-09-18 - 摘要：The development of modern society is bringing increasing problems of electromagnetic radiation and pollution. Microwave absorbing materials (MAM) are widely used in electromagnetic interference, electromagnetic compatibility, information security and human body protection applications. High absorption,broad absorption bandwidth and lightweight are the requirements of high performance MAM. Because of their advantages of softness, cohesiveness and easy to tailor into certain shape, rubber based MAM can be used as the absorbing layer of devices with complex structures or inner surfaces of cavities. This paper introduced the basic principles of designing MAM, reviewed the characteristics of different kinds of rubber MAM, discussed the effect of absorbent, structure design, external factors on the microwave absorbing properties, and gives the developing prospect of rubber MAM.关键词：Rubber;Microwave absorbing materials;Microwave absorbing properties
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发布时间：2022-09-18 - 摘要：As renewable resource, natural rubber (NR) has been widely used in many applications including aerospace, war industry and medical treatment due to its excellent comprehensive performances. However, the poor resistances to oil, organic solvent, thermo-oxidative ageing and ultraviolet rays, which drives from its nonpolar and unsaturated chemical chain structures, NR is underperformed in some special fields. Therefore, the modification of NR has attracted great attention in both academia and industry. Herein, the progresses achieved in the recent years are summarized from three aspects,i. e. chemical modification, bleeding modification and organic fillers-filled modification.关键词：Natural rubber;Chemical modification;Blending modification;Nanofillers-filled modification;Structures- property mechanism
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发布时间：2022-09-18 - 摘要：Damping materials, especially rubber damping materials, are a kind of special functional materials to absorb vibration and reduce noise. Because they can improve the work environment of human and machine and moreover enhance the design and manufacturing level,damping rubber materials have been widely used in multitudinous fields as high-speed train and light rail, aviation and spaceflight, marine warships, mechanical engineering and national security etc. However, with the speedy progress in social civilization, design and manufacture level, and the high and new technology,the quality requirement to rubber damping materials is becoming higher. It encourages the novel high performance damping rubber materials being competitively researched and exploited. In the article we will comment the latest research progress in damping rubber materials from such aspects as the rubber matrix selections,molecular structure and microstructure design, as well as construction on special damping mechanism etc.关键词：Damping materials;Rubber;Progress
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发布时间：2022-09-18 - 摘要：Coordinative chain transfer polymerization (CCTP) involves the use of a single transition metal-based catalyst and a chain transfer agent (CTA). The heart of CCTP is the highly efficient, rapid and reversible chain transfer reaction between active transition metal-based propagating centers and CTA. In comparison with anionic polymerization, coordinative chain transfer polymerization (CCTP) enables the growth of several macromolecular chains per active species. Moreover, CCTP can additionally afford a stereoselective polymerization, leading to the stereoregular polymeric microstructures and architectures under living conditions. This paper briefly reviews recent major advances in CCTP of 1,3- dienes,involving its basic principle, CCTP of 1, 3-dienes, coordinative chain transfer copolymerization of 1,3-dienes and chain shuttling polymerizaition of 1,3-dienes.关键词：1,3-Dienes;Coordinative chain transfer polymerization;Chain shuttling polymerization.
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发布时间：2022-09-18 - 摘要：The homopolymerization and copolymerization of conjugated dienes using rare earth Ziegler-Natta catalysts, lanthanide metallocene catalysts and non-metallocene rare earth complex catalysts were reviewed. The catalytic behavior, stereoselectivity, microstructure, molecular weight and molecular weight distribution of the obtained polymers were greatly affected by the type of rare earth metals, structure of ligands, cocatalyst and promoters. Polybutadiene, polyisoprene, butadiene-isoprene copolymer, cojugated diene/styrene copolymer with various microstructures could be prepared by these catalysts at different reaction conditions. In addition, the novel composites of crystallizable high-cis butadiene-styrene elastomer with styrene-based polymer could be achieved and the "three steps in one-pot" polymerization technique had been also developed.关键词：Rare earth catalyst;Conjugated dienes;Styrene;Stereospecificity
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发布时间：2022-09-18 - 摘要：Functionalization has become an important way to obtain high performance polymer materials. Polymer functionalization has been developed from chain-end functionalization to in-chain functionalization. By living anionic polymerization the methodology of precise synthesis of dendrigraft polymers was studied. In-chain functionalized polymers with functional groups of definite function, accurate quantity and precise position were synthesized by the living anionic copolymerization of general monomers such as butadiene/isoprene/styrene and 1,1-diphenylethylene (DPE) derivatives with functional groups such as DPE-OSi and DPE-SiH. Then many kinds of functional groups were able to get by the transition reaction from DPE-OSi and DPE-SiH to other functional groups. The precise synthesis methodology of in-chain functionalized polymers with the complex topology structure was studied and the relationship between the structure and property of above polymers was understood.关键词：Living anionic polymerization;Dendrigraft polymer;In-chain functionalized polymer
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发布时间：2022-09-18
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