文献类型：期刊文献

英文题名：Facile Construction of Hierarchical Polymeric Positive Temperature Coefficient Composites for Improved Reproducibility

作者：Wang, Bao-Yu[1];Zhao, Heng-Yu[1];Ji, Xin[2];Hu, Wei[1];Duan, Yu-Ru[2];Li, Jian-Ze[2];Zhang, Zi-Hao[2];Liang, Ying[2];Fang, Bin[2];Zhang, Zhen[2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China

年份：2026

卷号：44

期号：8

起止页码：2681

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20262320840327);WOS:【SCI-EXPANDED(收录号:WOS:001780896800001)】；

基金：This work was financially supported by the Undergraduate Training Program on Innovation and Entrepreneurship (Nos. 202510251118S and 202510251085).

语种：英文

外文关键词：Polymeric positive temperature coefficient thermistor; Solution mixing method; Hierarchical conductive networks; Reproducibility

摘要：Adopting composite matrices has great significance for improving the performance of polymeric positive temperature coefficient (PPTC) materials. However, the uncontrollable selective distribution of fillers in different matrices induced by the differences in compatibility severely limits the flexible design and regulation of conductive networks. A solution-mixing strategy based on the solubility difference of polymer matrices in different solvents was employed to flexibly fabricate hierarchical PPTC composites, achieving the precise localization of conductive fillers. In the hierarchical structure, PVDF/TiC served as the first-level PTC material, whereas the PA1010/TiC particles acted as the other-level PTC material. The PA1010/TiC particles serving as relay stations also participated in the construction of the PVDF/TiC conductive network. Benefiting from the restriction effect of the PA1010/TiC particles for the PVDF chains and TiC fillers, the negative temperature coefficient (NTC) effect was effectively suppressed, and a maximum I PTC of 8.9 was obtained. Moreover, in cyclic testing, the PVDF phase crystallized posterior to the PA1010 phase, generating compression and releasing latent heat for the PA1010 phase, which synergistically reinforced the crystallization of the PA1010 phase, enabling rapid reconstruction of long-range conductive networks in the entire system. Therefore, the reproducibility and I hold of the hierarchical PPTC thermistor were significantly improved. This strategy not only breaks the bottleneck of the selective distribution of fillers in the multi-matrix of PPTC materials, but also achieves dynamic control of hierarchical conductive networks, suggesting a new pathway toward the overall improvement of the performance of PPTC thermistors.