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Thermally Healable and Reprocessable Bis(hindered amino)disulfide-Cross-Linked Polymethacrylate Networks
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1021/acsmacrolett.7b00762
Akira Takahashi , Raita Goseki , Kohzo Ito 1 , Hideyuki Otsuka
Affiliation  

A facile approach to polymethacrylate networks that contain thermally exchangeable bis(2,2,6,6-tetramethylpiperidin-1-yl)disulfide (BiTEMPS) cross-linkers is reported, and the easily inducible healability and reprocessability of the obtained networks are discussed. The free radical polymerization of BiTEMPS cross-linkers and hexyl methacrylate (HMA) monomers afforded insoluble and colorless networks of poly(hexyl methacrylate) (PHMA) films, whose structures were characterized after de-cross-linking via thermal BiTEMPS exchange reactions with added low-molecular-weight BiTEMPS. Swelling experiments and stress-relaxation measurements at elevated temperatures revealed the contribution of BiTEMPS as a polymer chain exchanger both in the gels and in the bulk. The BiTEMPS-cross-linked PHMA networks showed damage healability and repeatable reprocessability in the bulk by simple hot pressing at 120 °C under mild pressure (∼70 kPa). These results should grant facile access to various vinyl polymer networks with on-demand malleability.

中文翻译:

可热修复和可再加工的双(受阻氨基)二硫化物-交联聚甲基丙烯酸酯网络

报道了一种简便的方法来处理含有可热交换双(2,2,6,6-四甲基哌啶-1-基)二硫化物(BiTEMPS)交联剂的聚甲基丙烯酸酯网络,并讨论了所得网络的易诱导愈合性和可再加工性。BiTEMPS 交联剂和甲基丙烯酸己酯 (HMA) 单体的自由基聚合提供了聚甲基丙烯酸己酯 (PHMA) 薄膜的不溶性和无色网络,其结构在通过热 BiTEMPS 交换反应解交联后表征,并添加低-分子量BiTEMPS。高温下的膨胀实验和应力松弛测量揭示了 BiTEMPS 作为聚合物链交换剂在凝胶和本体中的贡献。BiTEMPS 交联的 PHMA 网络通过在温和压力(~70 kPa)下在 120 °C 下进行简单的热压,在本体中显示出损伤可修复性和可重复的再加工性。这些结果应该可以轻松访问具有按需延展性的各种乙烯基聚合物网络。
更新日期:2017-11-01
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