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首页> 外文期刊>Journal of Applied Polymer Science >Prestretching effect and recovery process of polyvinyl alcohol film crosslinked with tartaric acid
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Prestretching effect and recovery process of polyvinyl alcohol film crosslinked with tartaric acid

机译：用酒石酸交联的聚乙烯醇膜的血管效应和恢复过程

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摘要

The tartaric acid (TA)/polyvinyl alcohol (PVA) composite films were prepared with various TA concentrations from 5 to 20 wt%. The crosslinking due to TA improved the tensile characteristics such as tensile strength and the Young's modulus, and thermal stability of the films. The addition of TA in PVA led to a decrease in the crystallinity. Application of prestretching or preliminary deformation resulted in significant changes in both stress-strain behavior and tensile characteristics of both pure PVA and TA/PVA composite films. Although low preextension levels such as 5% strain did not change much the tensile characteristics, higher preextension levels improved the tensile strength but decreased the extensibility of the films. The recovery processes of the stretched films consisted of a fast recovery process for which most of the recoverable elastic deformation is seen took place within almost 30 min and a time-dependent long-lasting recovery process continued in time very slowly, which resulted in undesirable residual deformation. It was also observed that increasing TA concentration accelerated the recovery process, hence, improved the recovery properties of PVA. The use of TA in the membrane applications can be considered to improve the mechanical properties and reusability of the membrane technology.
机译：制备酒石酸（TA）/聚乙烯醇（PVA）复合膜，其各种TA浓度为5-20wt％。由于TA改善了诸如拉伸强度和杨氏模量的拉伸特性，以及薄膜的热稳定性引起的交联。在PVA中添加TA导致结晶度降低。纯度变形的施用导致纯PVA和TA / PVA复合膜的应力 - 应变行为和拉伸特性的显着变化。虽然5％菌株如5％菌株的低温级别没有变化，但较高的激活水平提高了拉伸强度，但降低了薄膜的延伸性。拉伸薄膜的恢复过程包括快速恢复过程，其中大部分可回收的弹性变形在几乎在30分钟内进行，并且时间依赖性的长持续恢复过程在时间非常缓慢地继续，这导致不希望的残余形变。还观察到，增加的TA浓度加速回收过程，因此改善了PVA的回收性质。可以考虑在膜应用中使用Ta以改善膜技术的机械性能和可重用性。

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