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控制聚尿素微囊的合成和活性二酸盐化合物的封装

Efterpi Avdeliodi¹, Anastasia Tsioli¹, Georgios Bokias¹

¹Department of Chemistry, University of Patras, GR-26504 Patras, Greece.

|January 23, 2024

概括

这项研究探讨了含有二酸盐的聚尿素微囊,用于自愈聚合物. 封装效率随着树脂基含量而降低,由于与基和湿度的反应,影响了长期稳定性.

科学领域:

材料科学材料科学材料科学
聚合物化学聚合物化学

背景情况:

聚氨酸微囊 (MCs) 用于赋予聚合物矩阵的自我愈合特性.
活性成分,如二酸,被封装在这些微囊中.

研究的目的:

设计和研究含有异黄二酸盐 (IPDI) 或六甲二酸盐 (HDI) 的聚尿素微囊.
了解Novolac树脂基功能对微囊形成和活性化合物稳定性的影响.

主要方法:

使用甲基二二酸 (MDI) 和二甲基胺 (DETA) 形成多尿素外的油在水乳液的界面聚合.
封装IPDI或HDI与内核中的Novolac树脂 (无保护,部分保护或完全保护).
通过MDI/DETA比率和同质化速率分析微囊的形成,大小和形状.
使用定位和减弱总反射率-里叶变换红外光谱法 (ATR-FTIR) 量化封装的异酸盐 (NCO) 群.

主要成果:

微囊的形成是由MDI/DETA比率决定的,而大小和形状取决于同质化速率.
封装的活性化合物含量随着Novolac树脂的基功能增加而降低,这表明NCO-基反应.
观察到MDI与未受保护的Novolac树脂的快速反应;由于与基的反应,NCO组在两个月内逐渐减少.
长期的NCO组降解 (超过两个月) 被湿度加快,特别是完全受保护的Acetyl Novolac树脂.
甲二酸盐 (HDI) 的反应性高于异黄二酸盐 (IPDI).

结论:

诺沃拉克树脂的基含量显著影响了聚尿素微囊中的封装二酸盐的稳定性.
异酸盐组与基功能之间的反应以及环境湿度的反应是影响长期性能的关键降解途径.
仔细选择树脂保护和了解环境因素对于优化基于这些微囊的自我愈合材料的设计至关重要.

关键词:

其他NCO化合物.六甲基二异酸二甲二异酸异氨酸二酸二酸盐的异氨酸.微囊中的微囊.诺沃拉克树脂诺沃拉克树脂

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