回火过程应力场计算机模拟

回火过程应力场计算机模拟林家骝，杨振枢，于震宗，段贵明（清华大学）郭剑仁，史全兴，谢克仁（内蒙古第一机器厂）ＡＳｔｕｄｙｏｆＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎｏｆＳｔｒｅｓｓＦｉｅｌｄｄｕｒｉｎｇＴｅｍｐｅｒｉｎｇ￥ＬｉｎＪｉａｌｉｕ；ＹａｎｇＺ...     

CCWELD:A CIM system for robotic arc welding

ＣＣＷＥＬＤ：ＡＣＩＭｓｙｓｔｅｍｆｏｒｒｏｂｏｔｉｃａｒｃｗｅｌｄｉｎｇ￥ＫＯＮＧＹｕ；ＤＡＩＭｉｎｇ；ＷＵＬｉｎａｎｄＨＵＡＮＧＤｏｎｇｓｈｅｎｇ（ＷｅｌｄｉｎｇＤｅｐａｒｔｍｅｎｔ，ＨａｒｂｉｎＩｎｓｔｉｔｕｅｏｆｔｅｃｈｎｏｌｏｇｙ，Ｈａｒｂ...     

煤焦油蒸馏的新产品-改质沥青的生产

论述了利用热缩聚方法对中温沥青进行改质处理来生产改质沥青 ,提高了沥青的软化点、β树脂含量及结焦值 ;并介绍了生产工艺的特点、主要工艺参数及产品的质量     

丙烯酸酯三元共聚物酸掺杂改性聚苯胺的研究

选择丙烯酸 (AA)、丙烯酸丁酯 (BA)和甲基丙烯酸甲酯 (MMA)三元共聚物对聚苯胺 (PAn)进行改性 ,研究了BA的用量和引发剂浓度对PAn导电率的影响 ,对样品进行DSC、FTIR和SEM测试。结果表明 ,丙烯酸酯三元共聚物酸对PAn有良好的掺杂改性作用 ,当共聚单体 (AA -BA -MMA)组成为 10∶45∶45 (质量比 ) ,引发剂浓度为0 0 5 48mol·L-1时 ,可制得电导率达 1 42 1S·cm-1的导电PAn。     

Preparation of high-strength and high-modulus poly(vinyl alcohol) fibers by crosslinking wet spinning/multistep drawing method

This study is mainly focused on the preparation of high-strength and high-modulus poly(vinyl alcohol) (PVA) fibers by crosslinking wet spinning and multistep drawing. High strength as well as high modulus can be achieved by introduction of the crosslinks into the oriented chains to reduce entanglement degree and slippage between chains. The relationships between mechanical properties and fine structure of the drawn fibers were examined based on results of measurements of tensile property, thermal property, dynamic viscoelasticity, crystallinity, and orientation. The strength and Young's modulus of the drawn fibers are approximated to 1.82 and 51.76 GPa, respectively. The fiber has a sharp melting peak temperature that appeared at 236.7°C in the differential scanning calorimeter (DSC) curve. Our results indicate the multistep drawing procedure is superior to the conventional one-step drawing procedure. These excellent mechanical properties can be directly attributed to their high orientation of the amorphous chains. © 1994 John Wiley & Sons, Inc.     

Functionalized carbon nanotubes: properties and applications

Carbon nanotubes can be functionalized via amidation and esterification of the nanotube-bound carboxylic acids. The solubility of these functionalized carbon nanotubes makes it possible to characterize and study the properties of carbon nanotubes using solution-based techniques. Representative results concerning the solubility, dispersion, defunctionalization, and optical properties of the functionalized carbon nanotubes are presented. Several examples for the use of functionalized carbon nanotubes in the fabrication of polymeric carbon nanocomposites, the probing of nanotube-molecule interactions, and the conjugation with biological species are highlighted and discussed.     

纳米四氧化三铁磁性微粒的表面有机改性

通过液相共沉淀法制备了纳米四氧化三铁溶胶，利用油酸对纳米粒子体进行表面改性和萃取实验，获得油酸包覆的四氧化三铁微粒。采用FT—IR和高分辨透射电镜对改性后的纳米粉体进行结构和形貌的表征。研究结果表明油酸与四氧化三铁纳米粒子间存在化学键结合。油酸对纳米四氧化三铁微粒进行改性，并且对纳米粒子进行包覆，使外表面形成保护层阻止粒子团聚，改性后的四氧化三铁微粒与有机物具有良好的相溶性，采用表面改性显著改善了纳米四氧化三铁微粒的性能指标。     

高岭土改性聚酯纤维

介绍了高岭土在改性聚酯中的作用、纤维级高岭土的性质以及改性聚酯的制造方法．指出了我国开发高岭土改性聚酯纤维的的前景．     

大分子表面改性剂在聚合物表面的富集行为

简述了大分子表面改性剂添加到聚烯烃基体中时接触介质的诱导作用和聚烯烃基体结晶的异质排斥作用及其相对分子质量、链节的柔顺性和与基体的相容性对其表面富集的影响。提出大分子表面改性剂设计合成的基本原则:化学结构和使用环境相匹配、憎水基功能团和亲水基功能团相适应、使用效率和功能持久性相平衡。介绍了大分子表面改性剂合成的主要方法。