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首页> 外文期刊>Journal of Applied Polymer Science >Syndiotacticity-rich ultrahigh molecular-weight poly(vinyl alcohol) film. I. Determination of optimum polymer concentration by zone-drawing method in film preparation
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Syndiotacticity-rich ultrahigh molecular-weight poly(vinyl alcohol) film. I. Determination of optimum polymer concentration by zone-drawing method in film preparation

机译：富同规立构的超高分子量聚乙烯醇薄膜。一，薄膜制备中采用区划法确定最佳聚合物浓度

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摘要

A new method using a simple zone-drawing technique has been suggested for determining the optimum initial concentration of a polymer solution that has suitable macromolecular entanglements. This method was developed to replace the incorrect inherent viscosity-measuring method for syndiotacticity-rich (syndiotactic diad content of 63.4%) ultrahigh molecular-weight (number-average degree of polymerization of 12,300) (UHMW) poly(vinyl alcohol) (PVA) solution. Syndiotacticity-rich UHMW PVA. films were prepared from dimethyl sulfoxide (DMSO) solutions with different initial concentrations: of 0.1, 0.2, 0.3, 0.4, and 0.5 g/dL. In order to investigate the drawing behavior of the syndiotacticity-rich UHMW PVA films with different solution concentrations, the films were drawn under various zone-drawing conditions. Through a series of experiments, it was discovered that the initial concentration of PVA solution in DMSO caused significant changes in the draw ratio of the syndiotacticity-rich UHMW PVA film. That is, the one-step and maximum zone draw ratios of the film at an initial concentration of 0.3 g/dL exhibited its maximum values and gradually decreased at higher or lower concentrations. Thus, it was disclosed that the initial concentration of 0.3 g/dL is the optimum polymer concentration to produce a maximum draw ratio in this work. Based on the above results, it may be concluded that the optimum concentration of the initial PVA solution can be determined directly by measuring the zone draw ratio. The draw ratio, birefringence, crystallinity, degree of crystal orientation, tensile strength, and tensile modulus of the maximum drawn PVA film were 32.9, 0.0449, 0.61, 0.991, 1.91, and 46.2 GPa, respectively. (C) 2000 John Wiley & Sons, Inc. [References: 44]
机译：已经提出了一种使用简单的区域绘制技术的新方法来确定具有合适的大分子缠结的聚合物溶液的最佳初始浓度。开发此方法来替代不正确的固有粘度测量方法，该方法用于富同规立构（间同立构二单元含量为63.4％）超高分子量（数均聚合度为12,300）（UHMW）聚乙烯醇（PVA）解。富含同规立构的UHMW PVA。由具有不同初始浓度：0.1、0.2、0.3、0.4和0.5 g / dL的二甲基亚砜（DMSO）溶液制备薄膜。为了研究具有不同溶液浓度的间同立构规整的UHMW PVA薄膜的拉伸行为，在不同的区域拉伸条件下对薄膜进行拉伸。通过一系列实验，发现DMSO中PVA溶液的初始浓度引起了富同规立构的UHMW PVA薄膜的拉伸比发生显着变化。即，在初始浓度为0.3g / dL时，膜的一步和最大区域拉伸比显示出其最大值，并且在较高或较低浓度下逐渐减小。因此，公开了0.3g / dL的初始浓度是在该工作中产生最大拉伸比的最佳聚合物浓度。根据以上结果，可以得出结论，可以通过测量区域拉伸比直接确定初始PVA溶液的最佳浓度。最大拉伸的PVA膜的拉伸比，双折射，结晶度，晶体取向度，拉伸强度和拉伸模量分别为32.9、0.0449、0.61、0.991、1.91和46.2GPa。 （C）2000 John Wiley＆Sons，Inc. [参考：44]

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