Heat-resistant polyurethane films with great electrostatic dissipation capacity and very high thermally reversible self-healing efficiency based on multi-furan and liquid multi-maleimide polymers

被引:80
作者
Fu, Gaohui [1 ]
Yuan, Li [1 ]
Liang, Guozheng [1 ]
Gu, Aijuan [1 ]
机构
[1] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Jiangsu Key Lab Adv Funct Polymer Design & Applic, State & Local Joint Engn Lab Novel Funct Polymer, Suzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
DIELS-ALDER REACTION; NETWORKS; COMPOSITES; INTERFACES; CHEMISTRY; COATINGS; EPOXY; RESIN; FIELD;
D O I
10.1039/c6ta00953k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Single-function, low temperature resistance and low self-healing efficiency are three big bottlenecks that restrict the applications of existing reversible self-healing polyurethane (PU) films in leading industries. Herein, starting with synthesizing new polymer with multi-furan rings (FPU) and liquid hyperbranched polysiloxane terminated by multi-maleimide (HSiNCM) as well as using acidified multi-walled carbon nanotubes (aCNTs) as the conductor, a new kind of thermally reversible self-healing PU film that simultaneously has good processing property, high thermal stability and great electrostatic dissipation capacity, coded as PU-DA-CNTs, was designed and synthesized. The thermally reversible ability of PU-DA-CNTs was based on the Diels-Alder (DA) reaction. With about 1.96-4.76 wt% aCNTs, the resultant PU-DA-CNT films have outstanding thermal stability; their initial decomposition temperatures are 283-298 degrees C, at least about 20-40 degrees C higher than those of reversible self-healing PU films in the literature; in addition, the cracks on the surface of the PU-DA-CNT film can be self-healed after the film was maintained at 130 degrees C for 5 min, and the self-healing efficiency of the 1st cycle is as high as 92.54%, almost the highest value for reversible self-healing materials reported to date. Multi-maleimide groups in PU-DA-CNTs provide higher proceeding possibility of the DA reaction between furan rings and maleimide groups, thus leading to a high self-healing efficiency. On the other hand, PU-DA-CNT films have outstanding electrostatic dissipation capacity; their surface resistance, static decay half-life and conductivity are 3.094 x 10(8) Omega, 0.07 s and 4.116 x 10(-8) S cm(-1), respectively. These attractive integrated performances of PU-DA-CNT films are proved to be derived from the special structure and advantages of FPU, HSiNCM and aCNTs.
引用
收藏
页码:4232 / 4241
页数:10
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