文献类型：期刊文献

英文题名：Synthesis, characterization and mechanical properties of polyester-based aliphatic polyurethane elastomers containing hyperbranched polyester segments

作者：Zhang, Jie;Hu, Chun Pu[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2008

卷号：44

期号：11

起止页码：3708

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20084511686353);WOS:【SCI-EXPANDED(收录号:WOS:000261722600038)】；

语种：英文

外文关键词：Hyperbranched polyester; Aliphatic polyurethane; Hydrogen-bond; Microphase separation; Crosslinking density

摘要：Aliphatic polyester-based polyurethane (PU) elastomers with hyperbranched polyester segments were synthesized from polyester diol, hydroxyl-terminated hyperbranched polyester (HB-20), isophorone diisocyanate (PDI) and 1,4-butanediol. The crosslinking density of the PU elastomer was calculated by using Flory-Rehner equation. The degree of hydrogen bonding, the microstructure and the morphologies of these PU materials were characterized by means of FT-IR, WAXD and DSC, respectively. The experimental results showed that the PU elastomers containing small amount of HB-20 exhibited the enhanced hydrogen bonding and mechanical properties. As compared with the comparable PU specimen, the tensile strength of the polyester-based aliphatic PU containing 6 wt% HB-20 increased by 71.2 times, up to 36.1 MPa, and the elongation at break was still as high as 333.1%, resulting from the dual effects of the hydrogen bonding and the crosslinking density in the PU system. (C) 2008 Elsevier Ltd. All rights reserved.