Effect of Isocyanate Hard Segment on Structure and Property of Polyurethane

被引：0
|
作者：
Liu C. [1 ]
Shi Y. [1 ]
Ma C. [1 ,2 ]
Liu L. [1 ]
Liu Z. [1 ,2 ]
Que Y. [1 ]
Wang L. [1 ,2 ]
机构：
[1] Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang
[2] School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2021年 / 37卷 / 03期
关键词：
Isocyanate; Phase separation; Polyurethane; Small angle scattering;
D O I：
10.16865/j.cnki.1000-7555.2021.0076
中图分类号：
学科分类号：
摘要：
Types and contents of isocyanate have important influence on the structure and properties of polyurethane. In this paper, a series of polyurethane (PU) with different types of hard segments and different ratios of hard segment to soft segment were synthesized by prepolymer method with 2, 4-toluylene diisocyana(TDI), diphenyl-methane-diisocyanate (MDI) and hexamethylene diisocyanate (HDI) as hard segment, and polytetrahydrofuran glycol (PTMG) as soft segment, respectively. The influence of isocyanate type and proportion on the phase separation structure and properties was studied by infrared spectrum, small angle X-ray scattering, dynamic mechanical analysis and thermogravimetry. The results show that the polyurethanes synthesized with flexible aliphatic isocyanate have higher phase separation degrees, and the glass transition temperature of soft segments and hard segments has more significant difference. The degree of phase separation of polyurethane synthesized with rigid isocyanate TDI is lower, and the glass transition temperature of the soft and hard segments has no significant difference, so it is more suitable for damping and sound absorbing materials. At the same time, with the increase of isocyanate index, the content of hard segment is increased, the segment movement becomes more difficult, and the phase separation degree is decreased, which makes the mechanical properties of polyurethane increase and heat resistance decrease. © 2021, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：79 / 84
页数：5
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