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Synthesis and characterization of hydroxypropyl terminated polydimethylsiloxane-polyurethane copolymers

机译:羟丙基封端的聚二甲基硅氧烷-聚氨酯共聚物的合成与表征

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摘要

Polyurethane (PU) block copolymers were synthesized using prepared hydroxypropyl terminated polydimethylsiloxane (HTPDMS MW 990) and polyether diols (N-210) as soft segment with 4,4′-diphenylmethane diisocyanate (MDI) and 1,4-butanediol. This low molecular weight polydimethylsiloxanes (PDMS) containing hydroxypropyl end-groups displayed better compatibility with PU than common PDMS. In this article, we illustrate its synthesis routes and confirmed the proposed molecular structures using NMR and infrared radiation (IR). We varied the contents of HTPDMS and N-210 in soft segments (HTPDMS - N-210: 0: 100, 20: 80, 40: 60, 60: 40, 80: 20, and 100: 0) to synthesize a series of PDMS-PU copolymer. IR spectroscopy showed the assignment characteristic groups of each peak in copolymers and confirmed that the desired HTPDMS-PU copolymers have been prepared. The different thermal, dynamic mechanical and surface properties of the copolymers were compared by thermogravimetry, DMA, contact angle and solvent resistance.
机译:使用制备的羟丙基封端的聚二甲基硅氧烷(HTPDMS MW 990)和聚醚二醇(N-210)作为软链段与4,4'-二苯基甲烷二异氰酸酯(MDI)和1,4-丁二醇合成聚氨酯(PU)嵌段共聚物。这种含有羟丙基端基的低分子量聚二甲基硅氧烷(PDMS)与普通PDMS相比,与PU的相容性更好。在本文中,我们说明了其合成路线,并使用NMR和红外辐射(IR)确认了拟议的分子结构。我们在软段中更改了HTPDMS和N-210的内容(HTPDMS-N-210:0:100、20:80、40:60、60:40、80:20和100:0),以合成一系列PDMS-PU共聚物。红外光谱显示共聚物中每个峰的归属特征基团,并证实已经制备了所需的HTPDMS-PU共聚物。通过热重分析,DMA,接触角和耐溶剂性比较了共聚物的不同热,动态机械和表面性能。

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