原子氧辐照对含苯并咪唑结构聚酰亚胺摩擦学性能影响研究  

Effect of Atomic Oxygen Irradiation on Tribological Performance of a Polyimide Containing Benzimidazole Groups

作　　者：王彦明 高晓红 李萍[1] 王廷梅 王齐华[2] WANG Yanming;GAO Xiaohong;LI Ping;WANG Tingmei;WANG Qihua(College of Materials Science and Engineering,Technology Innovation Center of Modified Plastics of Hebei Province,Hebei University of Engineering,Handan 056038,Hebei,China;Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Chemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]河北工程大学材料科学与工程学院,河北省改性塑料技术创新中心,河北邯郸056038 [2]中国科学院兰州化学物理研究所,兰州730000 [3]兰州理工大学石油化工学院,兰州730050

出　　处：《材料导报》2023年第4期216-222,共7页Materials Reports

基　　金：国家自然科学基金(21466009,51063003,51805140);河北省自然科学基金(E2018402121);中央引导地方科技发展资金项目(206Z1201G,216Z1202G);邯郸市科技计划项目(19422111008-22)。

摘　　要：聚合物及其复合材料的抗原子氧辐照性是影响其在空间装备应用过程中可靠性和安全性的重要因素。研究表明含硫、氮等杂原子的芳杂环聚合物具有一定的抗原子氧辐照性能。因此,从聚合物分子链角度出发设计并制备具有抗辐照性能的聚合物是一种有效的途径。目前,关于聚醚砜、聚砜及聚酰亚胺等聚合物抗辐照性能的研究表明,引入具有良好耐热性能的化学基团能有效提高聚合物的抗原子氧辐照性能。聚苯并咪唑因结构中特殊的苯并咪唑结构赋予了其良好的耐热性能,使其表现出良好的抗原子氧辐照的潜质。但聚苯并咪唑的合成条件较为苛刻,因此将苯并咪唑结构引入聚酰亚胺的主链中成为了一种改善其抗辐照性能的良好解决方案。本工作采用传统的两步法合成了一种含苯并咪唑结构的聚酰亚胺(PMI),研究了聚合物薄膜在原子氧辐照(AO)前后的力学性能和摩擦学性能,并与不含苯并咪唑基团的聚酰亚胺(YS-20)薄膜进行了比较。结果表明,含苯并咪唑结构聚酰亚胺的抗氧化性能和力学性能均优于不含苯并咪唑基团的聚酰亚胺(YS-20)。通过对比辐照时间对薄膜的影响,发现不同辐照时间后,PMI系列表现出较低的粗糙度。这一结果通过表面三维形貌图也得到了证明。通过对辐照后表面C和O元素价态和组成分析结果表明,与YS-20相比,PMI表现出较低的碳化程度。同时主链中芳杂环结构也提高了聚合物的耐温性能和机械强度,其中PMI的玻璃化转变温度高达365℃。通过球盘摩擦实验考察了辐照前后摩擦性能的演变。结果表明,由于抗AO性能的不同,聚合物薄膜的显微硬度和模量呈现出不同的变化趋势,导致AO辐照后的摩擦学性能不同。Anti-radiation property of atomic oxygen(AO)plays an important role in polymers and their complexes’reliability and safety in the application of space equipment.The studies show that polymers with aromatic heterocyclic group or structure such as sulfur and nitrogen can present anti-irradiation property to some extent.Therefore,the molecular structure can be designed in order to enhance the polymer’s anti-irradiation in essence.Now,the research on the radiation resistance of polymers such as polyethersulfone,polysulfone and polyimide shows that introducing chemical groups with excellent heat-resistance can effectively improve the anti-irradiation property.The benzimidazole structure endows polybenzimi-dazole the good potential to anti atomic oxygen irradiation,due to the superior heat-resistance.However,subject to the complex synthesis conditions of polybenzimidazole,synthesis of polyimide with benzimidazole structure in the backbone becomes the better choice.A polyimide containing benzimidazole groups(PMI)was synthesized with a traditional two-step method.The mechanical and tribological properties of the PMI film were investigated before and after atomic oxygen(AO)irradiation,and were subsequently compared with those of the polyimide without the ben-zimidazole group.The results showed that PMI presented superior anti-oxidation and mechanical properties to those of the polyimide without the benzimidazole group.Furthermore,a smoother surface was verified using the scanning electron microscopy(SEM)scans and 3D profile images,which indicated the better anti-AO irradiation properties of the PMI film.From analyzing the valence and composition of C and O elements on the irradiated surface,the results show that PMI shows a lower degree of carbonization than YS-20.At the same time,the aromatic heterocyclic structure in the main chain also improves the temperature resistance and mechanical strength of the polymer.The glass transition temperature of PMI is as high as 365℃.The evolution of friction properties before an

关 键 词：含苯并咪唑聚酰亚胺 原子氧辐照 摩擦性能 力学性能 

分 类 号：TQ31[化学工程—高聚物工业] TH117[机械工程—机械设计及理论]