ENHANCED PROPERTIES OF HYPERBRANCHED POLYURETHANE ELASTOMERS BASED ON POLYDIMETHYLSILOXANE/POLYETHER MIXED SOFT SEGMENTS

Journal of The Chilean Chemical Society

TANG, QIANYUN¹  MA, YAN¹  WANG, LIHONG¹  YAO, CHENG¹ 

[1] Nanjing University of Technology, Nanjing, P. R. China

关键词: Hyperbranched;    Polydimethylsiloxane;    Polyurethanes;    Microphase separation;   

DOI  :  10.4067/S0717-97072014000400005

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

A novel hydroxyl-terminated polymer HPMS-APE was synthesized by introducing allyl polyethylene oxide (APE) into hydrogen-terminated polydimethylsiloxane (HPMS) backbone by hydrosilylation reaction. A series of hyperbranched polyurethane elastomers (HBPUs) based on HMPS-APE and polypropylene glycol (PPG) mixed soft segments were successfully synthesized with trimethylolpropane (TMP) as a chain extender. The effect of HPMS-APE segments content on enhanced properties of HBPUs were characterized by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), atomic force microscopy (AFM), thermogravimetric analysis (TGA), mechanical testing and water absorption. It was found that incorporating HPMS-APE in polyurethanes made substantial changes in their morphology, thermal properties, mechanical properties and water absorption. When 5 wt% HPMS-APE was incorporated in HBPUs, the extent of microphase separation between hard and soft segments was the best, resulting in polyurethanes without significant compromise in tensile strength and elasticity. Furthermore, HBPUs derived from HPMS-APE presented excellent thermal stability and unique water resistance.

【 授权许可】

Unknown