Formation Mechanism and Inhibition Method of Thermoplastic Polyurethane Film Fisheyes

被引：0
|
作者：
Wei Y. [1 ]
Feng C. [1 ]
Huang T. [1 ]
Li Z. [1 ]
Li R. [1 ]
机构：
[1] College of Polymer Science and Engineering, Sichuan University, Chengdu
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2020年 / 36卷 / 03期
关键词：
Chemical structure; Fisheyes; Melting point; Thermal properties; Thermoplastic polyurethane film;
D O I：
10.16865/j.cnki.1000-7555.2020.0054
中图分类号：
学科分类号：
摘要：
The process improvements for the preparation of high performance polymer films are in urgent demand due to the defect of film products, especially granular bulges (fisheyes) existing on the film surface. In this work, thermoplastic polyurethane films were used as samples to find out the formation mechanism of polymer fisheyes. The differences in chemical structure and surface morphology of the fisheye and non-fisheye portions were fully studied by FT-IR, GPC and SEM. The thermal properties were evaluated by DSC and TG. The results reveal that the fisheye portion has a slightly higher molecular weight than the non-fisheye portion, and there is no significant difference in chemical structure between the two parts. More importantly, it is observed that the fisheye portion gets the higher hydrogen bond contents and crystallinity, while the melting temperature of TPU film ranges from 160℃ to 200℃, which is higher than the current processing temperature. Thus, the crystalline part cannot melt completely, and the unmelted particles cool down to form fisheyes. The research not only refute the previous theory of regarding fisheyes as physical impurities or ultra-high molecular weight polymers, but also help us to propose theoretical ideas of reducing the fisheye content of polymer films. © 2020, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：96 / 102
页数：6
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