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首页> 外文期刊>Journal of Applied Polymer Science >Properties and phase segregation of crosslinked PCL-based polyurethanes
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Properties and phase segregation of crosslinked PCL-based polyurethanes

机译：交联的PCL基聚氨酯的性能和相偏析

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摘要

Polyurethane (PU) films were prepared from different types of poly(ε-caprolactone) glycols and hexamethylene diisocyanate without using any other ingredients such as solvent, catalyst, or chain extender. Polymers were stabilized by crosslinking formed as allophanate and/or biuret linkages during the curing process. The effects of different components on the product properties such as chemical structure, microphase segregation, mechanical strength, thermo-mechanical, thermal properties, and surface hydrophilicities were investigated by FTIR-ATR, atomic force microscope, mechanical tester, dynamic mechanical analyses, thermogravimetric analyzer, differential scanning calorimetry, and contact angle measurements. Phase separation of hard and soft segments significantly varied depending on the type and molecular weight of diol and triol. Films containing urethane-urea bonds displayed the maximum phase separation and the highest mechanical strength. Polyols having higher molecular weight increased hydrophilicity while urea bonds caused a reverse effect resulted by bidentate hydrogen bonds. Results showed PUs with various properties can be synthesized via environmentally friendly process without using any solvent or catalyst.
机译：聚氨酯（PU）膜是由不同类型的聚（ε-己内酯）二醇和六亚甲基二异氰酸酯制得的，无需使用任何其他成分，例如溶剂，催化剂或扩链剂。通过在固化过程中以脲基甲酸酯和/或缩二脲键形成的交联来稳定聚合物。通过FTIR-ATR，原子力显微镜，机械测试仪，动态力学分析，热重分析仪研究了不同组分对产品性能的影响，如化学结构，微相偏析，机械强度，热机械，热性能和表面亲水性。 ，差示扫描量热法和接触角测量。硬链段和软链段的相分离取决于二醇和三醇的类型和分子量而显着变化。含有氨基甲酸酯-脲键的薄膜表现出最大的相分离和最高的机械强度。具有较高分子量的多元醇增加了亲水性，而脲键引起了由双齿氢键引起的逆作用。结果表明，可以通过环境友好的方法合成具有各种性质的聚氨酯，而无需使用任何溶剂或催化剂。

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