首页> 外文期刊>Journal of Applied Polymer Science >SPONTANEOUS BOILING UP AS A SPECIFIC RELAXATION PROCESS IN POLYMER-SOLVENT SYSTEMS
【24h】

SPONTANEOUS BOILING UP AS A SPECIFIC RELAXATION PROCESS IN POLYMER-SOLVENT SYSTEMS

机译:自发沸腾作为聚合物-溶剂体系中的一种特定的松弛过程

获取原文
获取原文并翻译 | 示例
           

摘要

The phenomenon of spontaneous bubble nucleation in extremely supersaturated (superheated) polymer-solvent systems has been studied experimentally. Spontaneous boiling-up temperatures T* for polystyrene and poly(ethylene glycol) solutions in a number of solvents have been measured at different values of pressure p and weight fraction of polymer c by the pulse heating method. The heating rate T varied from 10(5) to 10(7) K/s. For all systems studied, the values of T* have been found to increase with increasing p and c. The T*(p, c) dependence is discussed with the use of the data on the degree of compatibility of components. The peculiarities of polymeric solutions manifest themselves in the region c --> 1, as follows: (i) an abrupt increase (by 1-2 orders of magnitude) in the slope of the T*(c) dependence, and (ii) the appearance of the dependence of T* values on the heating rate. Our approach to the interpretation of this result assumes a change in the initial composition of a solution in the course of heating due to polymer decomposition. An example of the extended phase diagram of a polymer-solvent system including the kinetic surface of T*(p, c) is given. (C) 1996 John Wiley & Sons, Inc. [References: 27]
机译:实验研究了极过饱和(过热)聚合物-溶剂体系中自发气泡成核现象。已经通过脉冲加热方法在压力p和聚合物c的重量分数不同的条件下测量了多种溶剂中的聚苯乙烯和聚乙二醇溶液的自发沸腾温度T *。加热速率T从10(5)到10(7)K / s不等。对于所有研究的系统,已经发现T *的值随着p和c的增加而增加。 T *(p,c)依赖关系通过使用有关组件兼容程度的数据进行讨论。聚合物溶液的特殊性在c-> 1区域表现出来,如下所示:(i)T *(c)依赖性的斜率突然增加(增加1-2个数量级),并且(ii) T *值对加热速率的依赖性的出现。我们解释该结果的方法假设由于聚合物分解,在加热过程中溶液的初始组成发生了变化。给出了包括T *(p,c)的动力学表面的聚合物-溶剂系统的扩展相图的示例。 (C)1996 John Wiley&Sons,Inc. [参考:27]

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