日本宇部开发新型聚酰胺

日本宇部公司在德国举行的2005年国际包装展览会上称，该公司开发出新一代聚酰胺材料，材料采用PA6、PA66和PA12三元共聚物，主要应用是在肉类、谷物类和香肠包装等热成型膜等领域。     

帝斯曼新推高性能聚酰胺产品

<正>近日,帝斯曼工程塑料推出以聚酰胺410为基础的高性能生物工程塑料EcoPaXX。EcoPaXX是一种绿色环保的生物材料:约70%的聚合体基料含有源于可再生资源蓖麻油中的基础成分;在整个产品生命周期中呈100%     

新型聚酰胺弹性体——UBESTA XPA系列

UBESTAXPA系列是日本宇部兴产公司作为橡胶的替代材料，以提高屈挠疲劳特性为目标而开发的新型聚酰胺弹性体。     

日本欲打造塑料电动汽车

SIMDrive是日本川崎重工业株式会社的技术开发公司。为SIMDrive供应了多种材料的杜邦公司,据称,由于采用了轻质材料和独特的车轮电机系统,该原型车的行驶里程数得到显著提升:单次充电可行驶218英里,且从0英里加速至60英里只需5.4秒。SIMDrive是日本川崎重工业株式会社的技术开发公司。为SIMDrive供应了多种材料的杜邦公司,据称,由于采用了轻质材料和独特的车轮电机系统,该原型车的行驶里程数得到显     

最新的电动概念车

2007年1月,在美国底特律科博会议展览中心举行的"北美国际汽车展"上,通用公司旗下的土星Aura和雪佛兰Silverado分别荣获2007年北美年度轿车和年度卡车奖项。这届北美车展以概念车为亮点,各大汽车公司纷纷亮出手中王牌。其中,雪佛兰Volt全新电动概念车闪     

更新材料供货理念 降低汽车涂装成本

在剖析计划经济体制下的供货弊端和传统供货方式基础上 ,探讨了革新供货理念的问题。尤其是如何实现“系统供货”和“化学品集中管理”、建立“双赢”的新型伙伴关系 ;如何通过专业化管理来达到降低涂装成本 ,提高质量 ,增强竞争力的目的。     

车用汽油辛烷值浅论

本文简要地介绍了汽油辛烷值的基本概念以及辛烷值测量的意义。     

Monte Carlo simulation of molecular weight distribution and copolymer composition in transamidation reaction of polyamides

Melt mixing of polyamides results in exchange reaction and generation of copolymers. In this work, Monte Carlo method is used to simulate the time evolution of molecular weight distribution (MWD) and copolymer composition during the exchange reaction process between polyamides with AA and BC structure. The influences of initial composition and molecular weight have been investigated. Decrease in the difference between the average molecular weight of two kinds of polyamides results in faster approach of the MWD toward Flory's distribution and higher probability of producing copolymers. When the ratio between the numbers of initial molecules of two homopolymers is increased, the number of generated copolymers is reduced and the wider MWD is obtained. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Determination of molecular weight averages and molecular weight distribution by g.p.c. of N-trifluoroacetylated polyamides

To determine their molecular weight averages and molecular weight distribution, N-trifluoroacetylated (TFA) polyamides are studied using gel permeation chromatography in tetrahydrofuran at 25°C. Several calibration methods (calibration with polydisperse standards, universal calibration) are tested; among these, direct calibration of M_w of polydisperse samples vs. peak maximum of the corresponding g.p.c. chromatogram leads to the best results. Calculated molecular weight averages of nylon 6-TFA and Trogamid^R-TFA are compared with data from light scattering, viscometry and osmometry.