Characterization and low temperature test of the flexibly crosslinked polyurethane copolymer by poly(dimethylsiloxane)

被引：30

作者：

Chung, Yong-Chan ^{[3
]}

Park, Hyun Shik ^{[2
]}

Choi, Jae Won ^{[1
]}

Chun, Byoung Chul ^{[1
]}

机构：

[1] Inje Univ, Inst Basic Sci, Ctr Nano Mfg, Dept Nano Engn, Gimhae 621749, South Korea

[2] Univ Suwon, Dept Polymer Engn, Hwasung, South Korea

[3] Univ Suwon, Dept Chem, Hwasung, South Korea

来源：

HIGH PERFORMANCE POLYMERS | 2012年 / 24卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

allophanate; flexible crosslinking; poly(dimethylsiloxane); spacer; shape memory; TRANSFER RADICAL POLYMERIZATION; STRUCTURE-PROPERTY RELATIONSHIP; MECHANICAL-PROPERTIES; BLOCK-COPOLYMERS; THERMOMECHANICAL PROPERTIES; POLYETHYLENEGLYCOL SPACER; TERMINATED POLYBUTADIENE; SEGMENT CONTENT; HARD SEGMENT; MEMORY;

D O I：

10.1177/0954008311435799

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Shape memory polyurethane (SMPU) flexibly crosslinked by a hydrophobic poly(dimethylsiloxane) (PDMS) spacer at its side through allophanate bonding was tested for shape recovery at -30 degrees C and compared to a linear SMPU. The SMPU was composed of 4,4'-methylenebis(phenylisocyanate) (MDI), poly(tetramethyleneglycol) (PTMG), 1,4-butanediol (BD), and PDMS that was connected to SMPU chains by a second MDI. The mechanical and shape memory properties of two types of SMPU, differing in PTMG and PDMS content, were compared. In the best case, a 283% increase in maximum stress compared to the linear polymer was attained without any sacrifice of strain. Shape recovery at 45 degrees C increased to 91% and remained at more than 80% after four cyclic tests. Shape recovery at 0 degrees C could be improved by increasing PDMS content, and the critical shape recovery temperature decreased with increasing PDMS content. The PDMS-crosslinked SMPU demonstrated instant shape recovery at -30 degrees C in comparison with the linear SMPU that must be warmed to room temperature for complete shape recovery. The extraordinary shape memory results were analyzed and are discussed together with differential scanning calorimetry and infrared data.

引用

页码：200 / 209

页数：10

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