文献类型：期刊文献

英文题名：Mechanochemical Effect of Filler Surface Functionality on Fluoropolymer Tribology

作者：Sun, Wei[1];Liu, Xiaojun[1];Song, Qingrui[1];Liu, Kun[1];Wang, Wei[1];Lu, Yunxiang[2,3];Ye, Jiaxin[1]

机构：[1]Hefei Univ Technol, Inst Tribol, Sch Mech Engn, Hefei 230009, Anhui, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2021

卷号：54

期号：13

起止页码：6417

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20213010672539);WOS:【SCI-EXPANDED(收录号:WOS:000674278700049)】；

基金：The authors acknowledge the financial support from the National Natural Science Foundation of China (grant numbers 51875153 and 51875152, 51975174). The authors also gratefully thank Yu Ning and Gang Qian (Hefei University of Technology) for their help in spectroscopy analysis and Dr. Zhu (East China University of Science and Technology) and Enze Xu (Hefei University of Technology) for their support in simulation work.

语种：英文

外文关键词：Filled polymers - Fillers - Carboxylation - Wear of materials - Plastic coatings - Tribology

摘要：The 10 000x wear resistance improvement of PTFE by a trace amount of nanofillers has been heavily studied in the past decade and attributed to the moisture-dependent, mechanochemical formation of adherent and carboxylate salt-rich transfer films. However, debates still exist on the role of the fillers in wear reduction. Based on experimental and computational studies of selected PTFE nanocomposites, we proposed that (1) filler-driven polymer defluorination was the first and key step in the mechanochemistry; (2) effective wear-reducing fillers lowered the energy barrier of the defluorination; and (3) filler surface functionality, the amount of chelation products in transfer film, and wear resistance were strongly correlated. This hypothesis was further supported by thermal experiments in this study, which showed that the mechanochemistry and wear resistance were both thermally sensitive.