车用复合材料新技术

根据车用复合材料的特点、功用和性能,介绍了几种研发中的车用复合材料,及复合材料在车身、悬架等系统上的应用;同时展望了车用复合材料的发展趋势.     

中国鑫达力推纤维增强车用复合材料综合解决方案

<正>中国领先的高分子复合材料生产商中国鑫达集团近日在一场由美国塑料工业协会(SPI)主办的"2016全球车用塑料行业峰会"全面呈现了其综合的纤维增强车用复合材料的解决方案,赢得了现场参会的主机厂的强烈兴趣。在鑫达介绍的方案中,既包括常见的玻璃纤维增强的方案,也包括更加低碳环保的生物质增强复合材料,以及具备更高强度、模量和机械强度的碳     

2017国际车用塑料与复合材料产业发展高峰论坛

正2017国际车用塑料与复合材料产业发展高峰论坛聚焦"车用塑料"和"车用复合材料"在汽车轻量化中的应用和创新。组委会将力邀车用塑料和复合材料相关技术领域的科研院所、设备厂家、材料企业、复材企业、零部件企业、整车企业,打通全产业链的产学研技术合作,推动国内车用塑料和复合材料在汽车轻量化应用中的资源整合、技术发展及产业应用。     

生物基可全降解高分子复合材料的加工进展

随着人们环保可持续发展意识的增强,生物可降解高分子材料领域发展迅速。通过分析近年来生物可降解高分子复合材料的相关文献,总结出以淀粉为主体材料制备的生物基可降解高分子复合材料的性能及加工方法研究进展。淀粉与天然高分子(壳聚糖、植物纤维、纤维素和木质素)、合成高分子(聚乳酸、聚羟基烷酸酯)、纳米材料等共混复合,可以加工生物可降解高分子复合材料。通常,在增塑剂、增容剂及增强剂等改性剂的作用下,淀粉与上述高分子材料通过挤压、注射成型、吹塑、溶液浇铸和流延法等加工成型成性能优良的复合材料,最后分析了各种改性剂对复合材料性能的影响,且对生物基可全降解高分子复合材料进行了展望。     

高分子复合材料应用及研究现状分析

从复合材料、高分子材料、高分子复合材料的研究现状、研究内容以及应用领域等方面进行探讨,最后结合目前研究成果,对高分子复合材料的未来研究方向进行了有益的探索。     

2017国际车用塑料与复合材料产业发展高峰论坛

正2017国际车用塑料与复合材料产业发展高峰论坛聚焦"车用塑料"和"车用复合材料"在汽车轻量化中的应用和创新。组委会将力邀车用塑料和复合材料相关技术领域的科研院所、设备厂家、材料企业、复材企业、零部件企业、整车企业,打通全产业链的产学研技术合作,推动国     

导热高分子复合材料研究进展

在介绍金属材料、无机非金属材料以及高分子材料导热机理的基础上,介绍了导热填料填充高分子复合材料的导热网链机理和热弹性组合机理2种导热机理,该理论可以解释导热高分子复合材料导热过程中不同的现象和规律;归纳了适用于粒子、纤维等填充的聚合物基复合材料的各种导热模型;讨论了树脂基体、导热填料和温度对于高分子复合材料热导率的影响...     

各向异性导电高分子复合材料的研究进展

综述了各向异性导电高分子复合材料的制备方法,包括电场诱导法、磁场诱导法、剪切拉伸诱导法和预取向导电填料法等,分析了各方法的特点及复合材料各向异性电性能的形成机理。总结了各向异性导电高分子复合材料对温度场响应行为的研究进展,并对各向异性导电高分子复合材料的应用前景进行了展望。     

高分子复合材料用导热填料研究进展

介绍了填充型高导热高分子复合材料中填料的研究现状,重点介绍了填料的种类、外形、粒径和表面处理等因素对复合材料导热性能的影响,展望了导热高分子复合材料中填料的研究趋势。     

高分子基导电复合材料研究进展

高分子基导电复合材料凭借其导电性、稳定性、加工性等方面的明显优势,成为导电材料研究的热点。系统地介绍了复合型导电高分子材料的导电机理、制备方法并对导电复合材料的应用进行了总结,并展望了导电高分子复合材料的发展趋势。     

汽车用高分子材料的老化测试技术进展

介绍影响汽车材料老化的主要因素，概述了国内外关于汽车材料、零部件、整车等的老化测试技术最新进展，包括自然老化和人工加速老化。另外，针对汽车内饰件和外饰件使用环境不同，给出了相关的试验标准。     

Improved adhesion of LDPE films to polyolefin foams for automotive industry using low-pressure plasma

The use of polymer films for technical applications has increased considerably in the last years, since they offer good balanced properties. Polymer films find many applications as individual materials or as laminates with other films, foams, membranes, etc. In these cases it is necessary to improve the low intrinsic surface energy of polymer films to ensure their optimum mechanical performance. In this work, low-pressure glow discharge plasma with different gases is used to improve the adhesive properties of a low-density polyethylene (LDPE) film, to obtain the optimum mechanical response of laminates with polyolefin foam for automotive applications (steering wheels). The results show a remarkable increase in T-peel strength of the adhesive joints. Furthermore, since automotive industry is characterized by high technical requirements, the evaluation of the durability of the adhesive joints (in terms of storage conditions: temperature and relative humidity) shows that the T-peel strength of adhesive joints is subjected to an aging process that slightly decreases their mechanical performance, but does not restrict the use of these laminates in automotive uses.     

Resistance of paint coatings to multiple solid particle impact: effect of coating thickness and substrate material

A novel technique has been developed to determine the resistance of paint coatings to multiple solid particle impact (i.e. solid particle erosion). The effect of paint layer thickness on erosion resistance was evaluated for two acrylic automotive topcoats. These coatings displayed a two-stage response to erosion. Initially, their thickness was reduced progressively, but once a critical thickness was reached the remaining coating was removed by individual impacts. A simple model is proposed to describe this behaviour. A new measure, specific erosion resistance, which takes account of the coating thickness, is defined to allow coatings with different thicknesses to be compared and has been applied to several industrially sprayed automotive clearcoats on both steel and polymer (TPO) substrates. The clearcoats exhibited significantly higher specific erosion resistance when applied to polymer substrates.     

Novel Polymer Electrolyte Membranes for Automotive Applications – Requirements and Benefits

During the past few years, the feasibility of using polymer electrolyte fuel cells in automotive power trains at an impressive performance level has been proven repeatedly. However, current fuel cell stacks are still largely based on decade‐old polymer electrolyte membrane technology thus limiting performance, durability, reliability, and cost of the fuel cell systems. The major challenge for membrane R&D constitutes the demand for polymer electrolytes that allow for system operation at higher temperatures and lower water management requirements without increased conduction losses. None the less, demanding automotive requirements will not compromise on other properties such as mechanical and chemical stability and gas permeability.     

The influence of different components on interpenetrating polymer network's (IPN's) characteristics as automotive top coats

The aim of this study was to investigate the influence of different components of interpenetrating polymer networks (IPNs) on their behavior in dual curing automotive applications. Dual curing is one of possible ways to obtain fast curing, scratch resistant coatings for use in OEM and car refinish applications. Dual curing systems, upon hardening, represent interpenetrating networks (IPNs) [1]. IPN's were obtained using novel acrylate-terminated hyperbranched polyester with high functionality and compared to classical 2-pack polyurethane clear coat.     

Layered particle-based polymer composites for coatings: Part II—Stone chip resistant automotive coatings

Especially in the course of modern automotive coatings comprising a reduced number of layers the resistance towards the stone chipping is becoming an issue. Layered double hydroxide (LDH)-based polymer composites are readily accessible materials and suitable to impart impact resistance to coatings, provided that an accurate understanding of the structure property relations both of the platelets and the composites is achieved.Incorporated into aqueous polymer dispersions the LDH particles are found in the resultant composites in the form of aggregated clusters, polymer intercalated stacks or exfoliated platelets depending on their size and the type of the intercalated anions.In addition LDH particles are found to be effective in the control of the coating layer architecture by affecting the spinodal phase separation of the incompatible polymers.Applied as a primer layer the LDH-based composites provided an excellent stone chip resistance to an automotive coating system.     

Auto applications drive commercialization of nanocomposites

Polymer nanocomposites have long attracted interest but until now they have failed to meet expectations in terms of commercial applications. With recent breakthroughs, particularly the introduction by General Motors of the first polyolefin-based nanocomposite for automotive exterior use, this scenario seems set to change. Caroline Edser examines the background to this development and provides some insights into future prospects for polymer nanocomposites in automotive and other applications.     

Mechanical,vulcametric, and thermal properties of the different 5‐ethylidene 2‐norbornene content of ethylene‐propylene‐diene‐monomer vulcanized with different types and compositions of peroxides

Ethylene‐propylene‐diene‐monomer (EPDM) rubber is an important commercial polymer. The vulcanization process significantly changes its thermal, mechanical, and vulcametric properties. This study was carried out to find optimum formulation of EPDM composite for a better application in automotive industry. Sixteen EPDM polymer samples having different 5‐ethylidene 2‐norbornene (ENB) and ethylene contents were vulcanized with different types and compositions of peroxide and coagents. The mechanical and vulcametric properties of these samples were measured and compared. The type of peroxide, coagent, and EPDM grade affected the mechanical, thermal, and vulcametric properties of the EPDM rubber to some extend. Use of aromatic peroxide and coagent increased the thermal stability slightly. Mechanical properties were changed very slightly with the change of peroxide type for the same content of peroxide and coagent. Scorch time and cure time decreased with initial increase of the peroxide content. EPDM compound vulcanized with BBPIB peroxide and TAC/S coagent has higher cure time than EPDM compound vulcanized with DMBPHa peroxide and TMPTMA coagent. Coran method was used for the modeling of experimental data. Velocity constant for the formation of peroxide radical and polymer radical were found for each case. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Mechanical Properties of Hybrid Fibers-Reinforced Polymer Composite: A Review

A review on the mechanical properties of hybrid fibers-reinforced polymer composite is presented in this article. Fiber-reinforced polymer composite has a lot of advantages such as high strength, low density, and ease of processing. Fiber-reinforced polymer composite has been used in many areas such as aerospace, automotive, and construction. Incorporation of two or more fibers into a single polymer matrix leads the development of hybrid composite. Hybridization can improve the mechanical properties of single fiber-reinforced polymer composite. This study shows that mechanical properties of natural fiber-reinforced polymer composite increase due to incorporation of comparably high elongation fibers.     

A hybrid ceramic-polymer composite fabricated by co-curing lay-up process for a strong bonding and enhanced transient thermal protection

A hybrid ceramic-polymer composite is fabricated by a co-curing lay-up process by combining a carbon nanotube (CNT) reinforced ceramic composite thin film with a carbon fiber reinforced polymer (CFRP) composite substrate. The ceramic nanocomposite thin film has good flexibility, thermal conductivity and high temperature tolerance. The polymer composite substrate is a carbon fiber reinforced bismaleimide composite that is widely used in aerospace and automotive industries. Finite element analysis (FEA) is used to investigate the maximum survival temperature with different thicknesses of the ceramic nanocomposite. The resultant hybrid composite shows good structural integrity and displays a pull-off bonding strength up to 8.3?MPa. In addition, thermal study illustrates that such a flexible CNT reinforced ceramic composite can effectively protect CFRP in an elevated temperature environment by delaying transient thermal conduction.