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首页> 外文期刊>Journal of Applied Polymer Science >Nonisocyanate thermoplastic polyurethane elastomers based on poly(ethylene glycol) prepared through the transurethanization approach
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Nonisocyanate thermoplastic polyurethane elastomers based on poly(ethylene glycol) prepared through the transurethanization approach

机译：基于经过筛选方法制备的聚（乙二醇）的非异氰酸酯热塑性聚氨酯弹性体

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摘要

Nonisocyanate thermoplastic polyurethane elastomers (NIPUs) were synthesized with the transurethanization approach. Dimethyl dicarbamates (DCs) were prepared by the reaction of a diamine with an excess of dimethyl carbonate in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as a catalyst. Then, the polymers were obtained under neat conditions through the reaction of DC with polyethyleneglycol of average molecular weight of 1500 g/mol (PEG1500) at variable temperatures in the presence of different amounts of 1,4-butanediol. TBD, dibutyltin dilaurate (DBTL), and K2CO3 were tested as catalysts. TBD and DBTL seemed to be more efficient than K2CO3 in the temperature range 140-160 degrees C. The obtained materials exhibited molecular weight values (M-w) up to 10,000 g/mol and thermal stabilities above 200 degrees C. The soft segments displayed glass-transition temperature values that varied from -49 to -1 degrees C and melting temperature values that varied from 38 to 49 degrees C. Compared to polyurethane analogs, the NIPUs exhibited higher crystallinities and thermal stabilities. (C) 2017 Wiley Periodicals, Inc.
机译：Nonisocyanate热塑性聚氨酯弹性体（NIPUs）与transurethanization方法合成。二甲基二氨基甲酸酯（DCS）用二胺与过量碳酸二甲酯的在1,5,7-三氮杂的存在下反应而制备[4.4.0]癸-5-烯（TBD）作为催化剂。然后，整齐的条件下通过DC的具有1500平均分子量的聚乙二醇的反应获得的聚合物克/摩尔（PEG1500）在以不同的量的1,4-丁二醇的存在变化的温度。 TBD，二月桂酸二丁基锡（DBTL），K 2 CO 3和测试了作为催化剂。 TBD和DBTL似乎是更有效的比K 2 CO 3中的温度范围为140-160℃。将所得到的材料表现分子量值（Mw）为高达10,000克/摩尔，高于200摄氏度的热稳定性的软链段玻璃显示转变温度值，从-49变化到-1℃和从38至49℃。相对于聚氨酯类似物变化熔融温度值，则NIPUs表现出更高的结晶度和热稳定性。 （c）2017 Wiley期刊，Inc。

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