Effect of soft segment structure on properties of polyurethane elastomers

被引：0
|
作者：
Zhang C. [1 ]
Zheng M. [1 ]
Li B.-G. [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, Zhejiang
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 10期
关键词：
Elastomer; Polyurethane; Properties; Soft segment; Structure;
D O I：
10.11949/0438-1157.20190477
中图分类号：
学科分类号：
摘要：
Using four different soft segments, i.e. polyterahydrofuran diol (PTMG), polycaprolactone diol (PCL), hydroxyl-terminated polybutadiene with high cis-1, 4 content (HTPB), and commercial hydroxyl-terminated polybutadiene produced by free radical polymerization (FHTPB), four kinds of polyurethane elastomers (PUE) were prepared by a two-step solution polymerization. The effects of soft segment structure on mechanical properties and thermal properties at room temperature and low temperature were investigated by tensile test, dynamic mechanical property analysis (DMA), differential scanning calorimetry (DSC) and thermogravimetric analysis. It has been found that the tensile strength and elongation at break of the four PUEs at low temperature (-30℃) are superior to those at room temperature. This is not only related to the autofrettage effect induced by crystallization of soft segment at low temperature, but also to the increase of the degree of micro-phase separation between the soft and hard segments. Compared with the other three kinds of PUE, the soft segment in HTPB-PUE has lowest polarity and glass transition temperature (Tg), so the micro-phase separation is in highest degree, and the elastomer has the most excellent flexibility. Even at -30℃, elongation at break of the HTPB-PUE is up to 660%. PCL-PUE and PTMG-PUE are rigid because their soft segments are easy to crystallize and their degree of micro-phase separation between soft and hard segment is low. The cyclic tensile testing indicated that HTPB-PUE and FHTPB-PUE still have excellent elasticity at -30℃. The results from DSC and DMA showed that the Tg of HTPB-PUE is much lower than the other three PUEs, and the value from DSC is about -103℃. The initial thermal decomposition temperatures of the four PUEs are very similar, and are all around 270℃. © All Right Reserved.
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页码：4043 / 4051
页数：8
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