Photoactivated Healable Vitrimeric Copolymers,Macromolecules

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Photoactivated Healable Vitrimeric Copolymers
Macromolecules ( IF 5.1 ) Pub Date : 2018-12-17 00:00:00 , DOI: 10.1021/acs.macromol.8b01898
Taylor Wright ₁ , Tanja Tomkovic ₂ , Savvas G. Hatzikiriakos ₂ , Michael O. Wolf ₁

Affiliation

A composite polymer based on vinylogous urethane vitrimer bonding with both photodimerizable and thermally exchangeable functionalities is described. Polymers containing various ratios of photodimerizable diaminoanthracene monomers and thermally exchangeable diaminoalkyl monomers linked by a common bisacetoacetate group are studied. It is demonstrated that alkyl amines undergo the necessary thermal exchange reactions for vinylogous urethane vitrimers, while aromatic amines do not. UV-induced dimerization of the anthracene units results in changes to the rheological properties and the glass transition temperature due to polymer cross-linking. Rapid and near-complete scratch healing upon heating is demonstrated, with a tunable onset temperature for healing controlled by UV irradiation. The viability of a composite vitrimeric system, wherein vitrimeric monomers are combined with non-vitrimeric, stimuli-responsive monomers to generate random copolymers with new properties, is demonstrated.

中文翻译：

光活化的可修复三聚体共聚物

描述了基于乙烯基类氨基甲酸酯三聚体键合的具有光二聚和热交换官能度的复合聚合物。研究了含有不同比例的光可二聚二氨基蒽单体和通过常见的双乙酰乙酸酯基连接的可热交换的二氨基烷基单体的聚合物。已证明烷基胺经历了乙烯基类氨基甲酸酯三聚体的必要的热交换反应，而芳族胺则没有。紫外线引起的蒽单元的二聚化由于聚合物交联而导致流变性质和玻璃化转变温度的变化。证明了加热后快速且接近完全的划痕愈合，并且具有可调节的起始温度，可通过紫外线照射控制愈合。复合玻璃体系统的生存能力，

更新日期：2018-12-17

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