• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and properties of poly(amide imide)s based on 2,2 '- or 4,4 '-bis(4-aminophenoxy)biphenyl and various bis(trimellitimide)s
【24h】

Synthesis and properties of poly(amide imide)s based on 2,2 '- or 4,4 '-bis(4-aminophenoxy)biphenyl and various bis(trimellitimide)s

机译：基于2,2'-或4,4'-双（4-氨基苯氧基）联苯和各种双（三苯甲酰亚胺）的聚（酰胺酰亚胺）的合成和性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Three series of isomeric poly(amide imide)s (series III, IV, and V) were synthesized by the direct polycondensation of 2,2'-bis(4-aminophenoxy)biphenyl (2,2'BAPB), 4,4'-bis(4-aminophenoxy)biphenyl (4,4'-BAPB), or their equimolar mixture (2,2'-BAPB/4,4'-BAPB = 1/1) with 12 diimide diacids and with triphenyl phosphite and pyridine as condensing agents. A comparison of the physical properties of these three series was also made. The inherent viscosities of series III, IV, and V were 0.25-0.84, 0.25-1.52, and 0.43-1.30 dL g(-1), respectively. Most of the series III polymers showed better solubility because of the non-para structure, with the solubility order found to be III > V > IV. According to X-ray diffraction patterns, the amorphous poly(amide imide)s had excellent solubility, whereas the crystalline polymers were less soluble. All the soluble polymers afforded transparent, flexible, and tough films, which had tensile strengths of 57-104 MPa, elongations at break of 3-20%, and initial moduli of 2.05-2.86 GPa. The glass-transition temperatures (measured by differential scanning calorimetry) were highest for series IV, which contained the rigid 4,4'-biphenyl units (254-299 degreesC); copolymer series V ranked second (237-277 degreesC), and series III, with crank 2,2'-biphenyl structures, had the lowest values (227-268 degreesC). The 10% weight-loss temperatures (measured by thermogravimetric analysis) were close to one another, ranging from 527 to 574 degreesC in nitrogen and from 472 to 543 degreesC in air. (C) 2002 Wiley Periodicals, Inc. [References: 36]
机译：通过2,2'-双（4-氨基苯氧基）联苯（2,2'BAPB），4,4'的直接缩聚反应，合成了三个系列的异构聚酰胺酰胺（系列III，IV和V） -双（4-氨基苯氧基）联苯（4,4'-BAPB）或其等摩尔混合物（2,2'-BAPB / 4,4'-BAPB = 1/1）与12个二酰亚胺二酸以及亚磷酸三苯酯和吡啶作为冷凝剂。还对这三个系列的物理性质进行了比较。系列III，IV和V的固有粘度分别为0.25-0.84、0.25-1.52和0.43-1.30 dL g（-1）。由于非对位结构，大多数III系列聚合物显示出更好的溶解度，其溶解度顺序为III> V> IV。根据X射线衍射图，无定形聚（酰胺酰亚胺）具有优异的溶解度，而结晶聚合物的溶解度较低。所有可溶聚合物均提供透明，柔性和坚韧的薄膜，其拉伸强度为57-104 MPa，断裂伸长率为3-20％，初始模量为2.05-2.86 GPa。 IV系列的玻璃化转变温度（通过差示扫描量热法测量）最高，该系列含有刚性的4,4'-联苯单元（254-299℃）。共聚物V系列排名第二（237-277℃），系列III具有曲柄2,2'-联苯结构，具有最低值（227-268℃）。 10％的失重温度（通过热重分析测得）彼此接近，在氮气中为527至574℃，在空气中为472至543℃。 （C）2002 Wiley Periodicals，Inc. [参考：36]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号