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首页> 外文学位 >The effect of crosslinking and copolymer composition on the peel adhesion between chlorinated polyethylene and acrylonitrile-butadiene elastomers.
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The effect of crosslinking and copolymer composition on the peel adhesion between chlorinated polyethylene and acrylonitrile-butadiene elastomers.

机译：交联和共聚物组成对氯化聚乙烯和丙烯腈-丁二烯弹性体之间剥离粘合力的影响。

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摘要

The adhesion between chlorinated polyethylene (CM) and acrylonitrile-butadiene (NBR) elastomers was evaluated using a T-peel adhesion test. Peel measurements were conducted under a wide range of temperatures and peel rates. Joint strength between vulcanized elastomers was found to be highly temperature sensitive, varying over three orders of magnitude between 25 and 125°C. As peeling temperatures increased, joint strength generally decreased.; The purpose of this research was to determine why vulcanized CM and NBR joints are so weak at elevated temperatures. During the course of the investigation, the effect of crosslinking on both the adhesive and cohesive strength of each adherend was investigated as a function of peel rate and temperature. In addition, the dependence of peel strength on interphase thickness was investigated by altering the thermodynamic miscibility of the adherends.; Curative migration was found to be responsible for the weak bonding between conventionally crosslinked CM and NBR adherends. The dimercaptothiadiazole cure system used in the CM composition is inhibited by zinc, which was shown to diffuse from the ZnO-accelerated NBR adherend into the surface of the CM adherend. As a result, covulcanizates of CM and NBR are held together primarily by polymer entanglements, rather than covalent bonds. Crosslinking of the chains removed from the entangled interphase weakened the apparent joint strength by reducing inelastic energy dissipation in the bulk of each adherend.; Normal crosslinking of each polymer was found to take place in the interphase when a peroxide cure system was substituted into the NBR recipe. In this case, an optimum degree of crosslinking was identified where adhesion is maximized. This optimum took place very early in the crosslinking process, near the point of incipient gelation. At higher levels of crosslinking bond strength decreased, exhibiting a dependence of Mc0.66 ± 0.02 at elevated test temperatures.
机译：使用T剥离粘合力测试评估了氯化聚乙烯（CM）和丙烯腈-丁二烯（NBR）弹性体之间的粘合力。剥离测量是在很宽的温度和剥离速率下进行的。发现硫化弹性体之间的接缝强度对温度非常敏感，在25至125°C之间变化超过三个数量级。随着剥离温度的升高，接合强度通常下降。这项研究的目的是确定为什么硫化的CM和NBR接头在高温下如此脆弱。在研究过程中，研究了交联对每种被粘物的粘合力和内聚强度的影响，这是剥离速率和温度的函数。另外，通过改变被粘物的热力学混溶性来研究剥离强度对相间厚度的依赖性。发现固化迁移是造成传统交联的CM和NBR被粘物之间弱结合的原因。用于CM组合物中的二巯基噻二唑固化体系受到锌的抑制，锌从ZnO促进的NBR被粘物扩散到CM被粘物的表面。结果，CM和NBR的硫化橡胶主要通过聚合物缠结而不是共价键结合在一起。从缠结的相间移出的链的交联通过减少每个被粘物主体中的非弹性能量耗散而削弱了表观的连接强度。当将过氧化物固化体系替换为NBR配方时，发现各聚合物在相间发生正常交联。在这种情况下，可以确定最佳的交联度，从而使附着力最大化。该最佳化发生在交联过程的早期，接近初始胶凝点。在较高水平下，交联键强度降低，在升高的测试温度下表现出对M c 0.66±0.02 的依赖性。

著录项

  • 作者

    Bates, Kenneth Allen.;

  • 作者单位

    The University of Akron.;

  • 授予单位 The University of Akron.;
  • 学科 Chemistry Polymer.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 271 p.
  • 总页数 271
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;工程材料学;
  • 关键词

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