基于氟化交联的多孔聚酰亚胺的结构调控及其摩擦行为研究

聂壮; 韩昊宇; 王旭; 刘向阳

doi:10.11777/j.issn1000-3304.2025.24317

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基于氟化交联的多孔聚酰亚胺的结构调控及其摩擦行为研究

研究论文 | 更新时间：2025-06-13

- 基于氟化交联的多孔聚酰亚胺的结构调控及其摩擦行为研究
- Study on the Regulation of Porous Structure and Tribological Behavior of Fluorinated Crosslinked Polyimide
- 高分子学报 2025年56卷第6期页码：937-945
- 作者机构：
  
  四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都 610065
- 作者简介：
  
  E-mail: wangxu@scu.edu.cn
  lxy@scu.edu.cn
- 基金信息：
  
  国家重点研发计划(基金号 2022YFB3806903);国家自然科学基金(基金号 ┣52422315);52273012┫;高分子材料工程国家重点实验室项目(20309051F3002)
- DOI：10.11777/j.issn1000-3304.2025.24317
  中图分类号：
- CSTR：32057.14.GFZXB.2025.7359
- 收稿日期：2024-12-31，
  
  录用日期：2025-02-12，
  
  网络出版日期：2025-04-16，
  
  纸质出版日期：2025-06-20
- 稿件说明：
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聂壮, 韩昊宇, 王旭, 刘向阳. 基于氟化交联的多孔聚酰亚胺的结构调控及其摩擦行为研究. 高分子学报, 2025, 56(6), 937-945

Nie, Z.; Han, H. Y.; Wang, X.; Liu, X. Y. Study on the regulation of porous structure and tribological behavior of fluorinated crosslinked polyimide. Acta Polymerica Sinica, 2025, 56(6), 937-945
聂壮, 韩昊宇, 王旭, 刘向阳. 基于氟化交联的多孔聚酰亚胺的结构调控及其摩擦行为研究. 高分子学报, 2025, 56(6), 937-945 DOI： 10.11777/j.issn1000-3304.2025.24317. CSTR： 32057.14.GFZXB.2025.7359.

Nie, Z.; Han, H. Y.; Wang, X.; Liu, X. Y. Study on the regulation of porous structure and tribological behavior of fluorinated crosslinked polyimide. Acta Polymerica Sinica, 2025, 56(6), 937-945 DOI： 10.11777/j.issn1000-3304.2025.24317. CSTR： 32057.14.GFZXB.2025.7359.

摘要

多孔含油聚酰亚胺(PI)因其优异的力学性能和耐磨性等被视作一种理想的轴承保持架材料，在航空航天等高精尖技术领域受到了广泛的应用. 但运行过程中的分子链的塑性滑移行为严重影响多孔轴承的服役寿命. 本研究基于预氟化-再烧结策略实现颗粒表面的共价交联，在限制分子链塑性滑移的同时有效抑制了颗粒间团聚所导致的片材内部大孔洞的存在及其尺寸不均一的问题，有效改善了含油多孔PI的摩擦磨损行为，相比未氟化处理的PI样品，预氟化-再烧结的样品摩擦系数和耐磨性能可得到进一步的优化.

Abstract

Porous oil-containing polyimide (PI) is widely used in high-precision fields such as aerospace due to its excellent mechanical properties and wear resistance. However

the plastic slip behavior of molecular chains during operation severely impacts the service life of porous bearings. To address this challenge

this study proposes a novel strategy of pre-fluorination followed by re-sintering. In this study

polyimide particles within porous PI are crosslinked through direct fluorination

forming a certain degree of chemical covalent bonding. The influence of different fluorination degrees on the pore structure of PI sheets during sintering

as well as the friction behaviors of the final products

were investigated. Results demonstrated that the pre-fluorination-re-sintering strategy achieved covalent cross-linking on the surface of porous PI particles

effectively restricting the plastic slip of molecular chains and inhibiting the formation of large pores and non-uniform pore sizes caused by particle agglomeration. Consequently

the friction and wear behavior of porous oil-containing PIs were significantly improved. Compared to the untreated PI samples

the friction coefficients and wear-resistant properties of the pre-fluorinated-re-sintered samples could be further optimized. This study provides a new idea for addressing the problem of solid-phase agglomeration and pore size regulation in porous polyimide. It also offers a novel strategy for limiting the plastic slip behavior of PI molecular chains in the future studies.

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