Tandem Metathesis Polymerization-Induced Self-Assembly to Nanostructured Block Copolymer and the Controlled Triazolinedione Modification for Enhancing Dielectric Properties
Tandem Metathesis Polymerization-Induced Self-Assembly to Nanostructured Block Copolymer and the Controlled Triazolinedione Modification for Enhancing Dielectric Properties
复制标题
串联复分解聚合诱导的纳米结构嵌段共聚物的自组装以及用于增强介电性能的受控三唑啉二酮改性
DOI：
10.1021/acs.macromol.8b01645
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发表时间：
2018-12-25
期刊：
影响因子：
5.5
通讯作者：
Xie, Meiran
中科院分区：
文献类型：
--
作者：
Chen, Jie;Sun, Ruyi;Xie, Meiran
基于1，2，4-三唑啉-3，5-二酮（1，2，4-triazoline-3，5-dione，简写为TRZ）的点击化学被用作介电材料的聚合物纳米结构设计的最有潜力的后功能化途径之一。该嵌段共聚物通过串联开环易位聚合和易位环化聚合合成，并在选择性溶剂中自组装成核壳纳米结构，其可以通过调节投料量以可控的方式被接枝改性，使Alder-烯与双键的反应首先发生在壳中的聚异戊二烯主链上，然后发生级联Alder-烯和Diels-烯反应，在核中具有五元环的聚乙炔主链上的桤木反应。改性后的嵌段共聚物的介电常数从16.2提高到20.3，介电损耗从0.031降低到0.013，进而降低到0.009，这为溶液中纳米结构的选择性后功能化提供了新的思路。
The efficient and versatile click chemistry based on 1,2,4-triazoline-3,5-dione (TAD) was used as one of the most potential postfunctionalizing pathways to specially design polymer nanostructure for dielectric materials. The block copolymer was synthesized by tandem ring-opening metathesis polymerization and metathesis cyclopolymerization and self-assembled into the core shell nanostructure in the selective solvent, which could be modified by TAD in a controlled manner by tuning the TAD feeding amount, enabling the Alder-ene reaction of TAD with the double bonds to occur first on the polynorbornene backbone in the shell and then the cascade Alder-ene and Diels-Alder reactions on the polyacetylene backbone bearing five-membered rings in the core. The modified block copolymers incorporating varied amount of urazole moieties exhibited enhanced dielectric constant from 16.2 to 20.3 and lowered dielectric loss from 0.031 to 0.013 to 0.009, which provides a new idea of the selective postfunctionalization of nanostructures in solution for regulating the polymer structure and properties.