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Polymers and Polymer Composites

PREPARATION AND PROPERTIES OF MDI-BASED POLYESTER POLYURETHANE ELASTOMER

March 1, 2014 By: Feng Yuan; Wenbo Liu; Fan Yang; Zhenqiang Zhu; Lifeng Hao; Jian Zhang; Weicheng Jiao; Rongguo Wang Research article

Title: PREPARATION AND PROPERTIES OF MDI-BASED POLYESTER POLYURETHANE ELASTOMER
Page Range: p.341-346
Author(s): Feng Yuan; Wenbo Liu; Fan Yang; Zhenqiang Zhu; Lifeng Hao; Jian Zhang; Weicheng Jiao; Rongguo Wang
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 22
Issue No: No. 3

Abstract
Polyurethane has been usually used as protective coating on structures, with an important mechanism being the impact-induced transition of the rubber to the glassy state. The better the mechanical property, the greater the mechanical loss, the wider the Tg range, and the Tg is more close to, but less than, the operating temperature, the better the protective coating. Here, the pre-polymer method is adopted to synthesize MDI-based polyester polyurethane (TPU) which has different hard segment contents. The influence of the hard segment content on the relevant performance of TPU is investigated. With the increase of the hard segment content, the tensile strength, Tg of the soft segment phase and the mechanical loss increase, while the viscosity of reaction solution increases rapidly, the elongation at break declines sharply, and the range of the Tg becomes narrower and narrower. Therefore, in order to obtain excellent protective coating, the hard segment content should not be too high. Testing proves 16.18% hard segment content to be most effective. 14 Refs.

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