Improved Characterization of Polyoxazolidinones by Incorporating Solubilizing Side Chains
Improved Characterization of Polyoxazolidinones by Incorporating Solubilizing Side Chains
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DOI：
10.1021/acs.macromol.2c02104
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发表时间：
2022-12
期刊：
影响因子：
5.5
通讯作者：
Allison R. Wong;Melissa Barrera;Arpan Pal;Jessica R. Lamb
中科院分区：
文献类型：
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作者：
Allison R. Wong;Melissa Barrera;Arpan Pal;Jessica R. Lamb
二氧化碳基聚恶唑烷酮（POxa）是用于高温应用的非异氰酸酯聚氨酯的新兴子类。目前具有刚性接头的POxa具有有限的溶解度，这阻碍了合成和表征。在此，我们报告了添加的烷基和烷氧基增溶基团的刚性螺环POxa和它们的聚（羟基恶唑烷酮）（PHO）前体。改性的聚合物可溶于多达六种有机溶剂中，从而能够表征关键性能（例如，摩尔质量和聚合物结构）。PHO脱水为POxa将溶解度从高极性溶剂改变为低极性溶剂，并将热稳定性提高了76-102 °C。POxa具有通过增溶基团结构调节的相对高的玻璃化转变温度（85-119 °C）和熔融温度（190-238 °C）。在这项研究中获得的影响溶解度，结构-性能关系和降解途径的因素的理解得到了改善，拓宽了可溶性POxa的范围，并使这类有前途的材料更合理的设计。
Carbon dioxide-based polyoxazolidinones (POxa) are an emerging subclass of non-isocyanate polyurethanes for high temperature applications. Current POxa with rigid linkers suffer from limited solubility that hinders synthesis and characterization. Herein, we report the addition of alkyl and alkoxy solubilizing groups to rigid spirocyclic POxa and their poly(hydroxyoxazolidinone) (PHO) precursors. The modified polymers were soluble in up to six organic solvents, enabling characterization of key properties (e.g., molar mass and polymer structure) using solution-state methods. Dehydration of PHO to POxa changed solubility from highly polar to less polar solvents and improved thermal stability by 76–102 °C. The POxa had relatively high glass transition (85–119 °C) and melting (190–238 °C) temperatures tuned by solubilizing group structure. The improved understanding of factors affecting solubility, structure–property relationships, and degradation pathways gained in this study broadens the scope of soluble POxa and enables more rational design of this promising class of materials.