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Polar-Functionalized, Crosslinkable, Self-Healing, and Photoresponsive Polyolefins.
Angewandte Chemie International Edition ( IF 12.257 ) Pub Date : 2019-11-18 , DOI: 10.1002/anie.201910002
Chen Zou,Changle Chen

The nonpolar nature of polyolefins is one of their biggest limitations. Now, an efficient route to generate polar-functionalized, crosslinkable, self-healing, photoresponsive polyolefins with thermoplastic, elastomeric, and thermosetting properties is reported. Tunable amounts of carboxylic acid and a cyclic comonomer are installed onto polyolefins by palladium-catalyzed terpolymerization reactions. The incorporated carboxylic acid unit can alter the surface properties of polyolefins. The subsequently introduced Fe3+ /citric acid combination induces dynamic crosslinking and enables self-healing. Under UV light irradiation, citric acid reduces Fe3+ to Fe2+ and decreases the crosslinking density. The Fe2+ moiety can be easily oxidized back to Fe3+ , making the process reversible at the expense of citric acid. The incorporated cyclic comonomer modulates the crystallinity of polyolefins, provides elastic properties, and installs carbon-carbon double bonds for sulfur-induced vulcanization.

中文翻译:

极性官能化,可交联,自修复和光响应性聚烯烃。

聚烯烃的非极性性质是其最大的局限之一。现在,已经报道了产生具有热塑性,弹性体和热固性的极性官能化的,可交联的,自修复的,光响应性聚烯烃的有效途径。通过钯催化的三元聚合反应将可调节量的羧酸和环状共聚单体安装到聚烯烃上。结合的羧酸单元可以改变聚烯烃的表面性能。随后引入的Fe3 + /柠檬酸组合物引起动态交联并实现自我修复。在紫外线照射下,柠檬酸将Fe3 +还原为Fe2 +,并降低了交联密度。Fe2 +部分可以很容易地氧化回Fe3 +,从而使该过程可逆,而柠檬酸却有所损失。
更新日期:2019-11-18
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