The stability of aliphatic azo linkages influences the controlled scission of degradable polyurethanes,Journal of Polymer Science

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The stability of aliphatic azo linkages influences the controlled scission of degradable polyurethanes
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2021-08-17 , DOI: 10.1002/pol.20210205
Sinu C. Rajappan ₁ , Brad J. Davis ₁ , Travis L. Thornell ₂ , Yoan C. Simon ₁

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A better understanding of polymer degradation and post-degradation processes are essential for the development of novel degradable polymers. Herein, we present the synthesis of a new aliphatic azo-containing polyurethane and its degradation behavior toward external stimuli like heat and UV light. A relatively stable radical forming azo-monomer present in the current polyurethane is readily undergoing thermal degradation, whereas the azo-group is less susceptible to optical degradation. A comparison of the stimuli-responsive properties of the new azo-polymer with a previously known, relatively active radical forming monomer incorporated azo-polymer reveals the dependencies of the monomer and radical stability in the controlled degradation process. Our results point toward the importance of radical activity in azo-containing polymers.

中文翻译：

脂肪族偶氮键的稳定性影响可降解聚氨酯的可控断裂

更好地了解聚合物降解和后降解过程对于开发新型可降解聚合物至关重要。在此，我们展示了一种新的脂肪族含偶氮聚氨酯的合成及其对外部刺激（如热和紫外线）的降解行为。当前聚氨酯中存在的相对稳定的形成自由基的偶氮单体很容易发生热降解，而偶氮基团不太容易发生光降解。新偶氮聚合物与先前已知的、相对活跃的自由基形成单体掺入的偶氮聚合物的刺激响应特性的比较揭示了单体和自由基稳定性在受控降解过程中的依赖性。我们的结果指出了含偶氮聚合物中自由基活性的重要性。

更新日期：2021-08-17

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