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首页> 外文期刊>Journal of Applied Polymer Science >Practical two-step chain extension method to prepare sulfonated waterborne polyurethanes based on aliphatic diamine sulphonate
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Practical two-step chain extension method to prepare sulfonated waterborne polyurethanes based on aliphatic diamine sulphonate

机译：实用的两步链扩展方法，基于脂族二胺制备磺化水性聚氨酯的制备

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摘要

We reported a novel synthesis route to fabricate sulfonated aliphatic waterborne polyurethane dispersions (SWPU) only based on 2-[(2-aminoethyl) amino] ethane sulphonate sodium (AAS-Na) by two-step chain extension method with the assistance of acetone and water cosolvent. When AAS-Na was added, only less than 50% of AAS-Na was incorporated into polyurethane chain in the first-step chain extension and the residual AAS-Na formed molecular aggregates which were insoluble in acetone due to the high polarity of AAS-Na. Subsequently, the mixture of acetone and water was added, the residual AAS-Na aggregates dissolved, undertaking the further second-step chain extension reaction, and the ultimate reaction conversion of AAS-Na rose to more than 90%. The mechanism for acetone and water cosolvent to affect the preparation of SWPU dispersions was studied, as well as the water resistance, mechanical properties and hydrolysis resistance of as-prepared SWPU dispersions. With the decrease of AAS-Na content from 2.0% to 1.2%, the peak area of the melting peaks for SWPU films increased, as well as the water resistance. And the as-prepared polyester SWPU exhibited good hydrolytic stability.
机译：报道了一种以2-[（2-氨基乙基）氨基]乙烷磺酸钠（AAS-Na）为原料，丙酮和水共溶剂为助溶剂，通过两步扩链法制备磺化脂肪族水性聚氨酯分散体（SWPU）的新方法。当添加AAS-Na时，在第一步扩链过程中，只有不到50%的AAS-Na被并入聚氨酯链中，残余的AAS-Na由于AAS-Na的高极性而形成不溶于丙酮的分子聚集体。随后，加入丙酮和水的混合物，溶解残余的AAS-Na聚集体，进行进一步的第二步扩链反应，AAS-Na的最终反应转化率上升到90%以上。研究了丙酮和水共溶剂对SWPU分散体制备的影响机理，以及制备的SWPU分散体的耐水性、力学性能和耐水解性能。随着AAS-Na含量从2.0%降低到1.2%，SWPU膜的熔融峰峰面积增大，耐水性增强。制备的聚酯SWPU具有良好的水解稳定性。

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