含氟聚醚砜特种工程塑料的合成及其摩擦学性能研究

发布时间：2018-03-05 10:22

本文选题：全氟基团　切入点：聚醚砜　出处：《吉林大学》2017年博士论文　论文类型：学位论文

【摘要】：该论文主要以本研究中心多年合成及制备聚醚砜(PES)系列特种工程塑料的研究为背景,依据经典亲核缩聚路线设计并制备了新型全氟端基与支链型PES系列聚合物,通过对分子链段结构、含氟基团位置、氟元素迁移行为以及不同载荷、转速等摩擦外部条件的讨论,研究了含氟PES特种工程塑料的摩擦学性能。全氟端基的引入对PES的力、热性能影响均较小;利用支链改性法能够明显提高氟元素在聚合物中的含量,但当全氟基团引入量过多时,聚合物主链结构改变明显,此类材料基本性能开始下降。通过热处理等条件分析了材料的氟迁移行为,得到了表面氟富集量最大化的系列PES摩擦材料。对比并研究了全氟端基与支链PES的摩擦学性能,考察了材料表面氟含量与摩擦性能的关系,纯PES具有高摩擦系数、高磨损率的特点,由于全氟基团的引入使得PES表面能得到迅速降低,材料的摩擦系数和磨损率均显著下降,在工程塑料自润滑领域具有较好的应用前景,相关研究也对特种工程塑料的摩擦学改性提供了指导。
[Abstract]:The thesis mainly in the Research Center for many years for synthesizing and preparing polyethersulfone (PES) series of special engineering plastics as the background, based on the novel perfluoroalkyl terminated and branched polymer PES series of classic nucleophilic polycondensation route design and preparation, the structure of molecular chain, fluorine radical position, fluorine migration the behavior and different loads, discuss the external conditions of speed friction, on the tribological properties of fluorinated PES special engineering plastics. Introducing perfluoroalkyl terminated on PES, smaller thermal performance; modified method can significantly improve the fluorine content in the polymer chain by, but when perfluoro group introduced quantity over time, the polymer backbone structure changed significantly, the basic properties of this kind of material began to decline. By the heat treatment conditions of material fluorine migration behavior, the surface fluorine accumulation in the maximum series of PES friction materials. The tribological properties of perfluoroalkyl terminated and branched PES studies and explores the relationship between the material ratio, surface fluorine content and friction properties of the pure PES with high friction coefficient, high wear rate, due to the introduction of perfluoro group makes the PES surface can be quickly reduced, the friction coefficient and wear rate of materials decreased significantly in the field of engineering plastics, self lubrication and has good application prospects, relevant research is of special engineering plastics tribological modification provides guidance.

【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TQ322.3

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