本文主要研究内容
作者董珊珊（2019）在《聚酰亚胺薄膜多场耦合作用下电子辐照损伤行为研究》一文中研究指出：本文基于空间常用聚合物材料中应用广泛的聚酰亚胺薄膜为研究对象,以研究其电子辐照损伤行为作为基础,通过自主设计的实验装置,对其进行应力场作用下电子辐照、应力场与温度场作用下电子辐照后损伤行为的研究,揭示出多场耦合作用下电子辐照后薄膜表面损伤机理和结构演化规律,深入分析了聚酰亚胺薄膜的拉伸性能和应力松弛行为等宏观性能与微观结构之间的对应关系,并考察了TiO2/聚酰亚胺中纳米TiO2层对聚酰亚胺薄膜电子辐照行为的影响,为聚酰亚胺薄膜在复杂的综合环境下的电子辐照损伤预测提供理论和数据支撑。不同外场条件下电子辐照后,聚酰亚胺膜表面出现不同程度的损伤。经电子辐照作用后,聚酰亚胺膜表面形成不规则的缺陷;经辐照与应力场耦合作用后,聚酰亚胺膜的表面发现了微裂纹、气隙等损伤形貌;经辐照、应力场和温度场的多场耦合作用后,薄膜表面呈现直径为50-100 nm的高密度粒状凸起的损伤形貌。同时,辐照及辐照与应力场耦合作用后,聚酰亚胺膜表面疏水性、表面硬度及弹性模量下降;多场耦合作用后,聚酰亚胺膜表面疏水性增强,表面接触角从80°上升至96°,表面硬度及弹性模量分别升高了7.61%和2.41%。电子辐照会引起聚酰亚胺膜拉伸性能的下降,试样的拉伸强度和断裂伸长率较原始试样分别下降了7.30%和21.59%;辐照与应力场耦合作用后,薄膜发生加速损伤,拉伸强度和断裂伸长率较原始试样分别下降了9.90%和34.08%;多场耦合作用时,高温环境下的电子辐照作用引起材料拉伸强度出现上升趋势,其拉伸性能的下降程度低于辐照与应力场耦合作用后的试样,拉伸强度和断裂伸长率分别较原始试样下降了5.48%和31.10%。通过研究不同外场条件下电子辐照后聚酰亚胺膜在150°C下的蠕变及回复行为,结果表明,与原始试样相比,不同作用后薄膜的蠕变应变量均出现下降。在经历辐照及辐照与应力场耦合作用后,试样的普弹形变比例下降,高弹形变及粘流形变的比例增加,其中粘流形变的比例从15.05%分别增加至21.64%和17.59%;多场耦合作用后,粘流形变的比例下降至4.82%,同时,聚酰亚胺的本体粘度明显增加,高于辐照及辐照与应力场耦合作用后的试样,且随辐照注量增加表现出先升高后下降的演化过程。此外,多场耦合作用时,随辐照注量的增加,材料的玻璃化转变点发生从原始的405.4°C升高至412.5°C再下降至404.5°C的变化过程。经不同环境的辐照作用后,材料均可保持较好的热稳定性。上述性能演化规律为聚酰亚胺薄膜在多场环境中应用的可靠性及寿命提供了有力的数据支持。电子辐照会降低聚酰亚胺分子链结构的有序度,多场耦合作用导致材料内部分子链的聚集态结构遭到破坏,并发生从半结晶态向无定型态的转变。辐照作用下,聚酰亚胺的主链及侧基的化学键断裂,反应程度随辐照注量增加而逐渐加强;辐照与应力场的耦合作用会加速C=O和NH2基的降解反应;多场耦合条件下温度升高促进材料内部交联,并发生苯环开环及表面氧化等复杂化学反应,薄膜中新生成了脂肪族C-C键和大量的C≡N键,表层的含氧基团为新生成的脂肪族醚CH2-O键。基于上述研究,本文在聚酰亚胺表面制备高稳定性纳米TiO2层,并分析沉积层对聚酰亚胺薄膜电子辐照行为的影响。TiO2/聚酰亚胺在经历电子辐照后,TiO2层的存在对基底聚酰亚胺起到防护作用,减少了辐照带来的表面缺陷及拉伸性能的劣化。与此同时,辐照后沉积层TiO2发生了Ti-O-Ti和Ti-O-N键的损伤及N-O键的生成,而基底聚酰亚胺中羰基的损伤程度降低。辐照与应力场耦合作用下TiO2遭到损伤,导致防护效果下降。
Abstract
ben wen ji yu kong jian chang yong ju ge wu cai liao zhong ying yong an fan de ju xian ya an bao mo wei yan jiu dui xiang ,yi yan jiu ji dian zi fu zhao sun shang hang wei zuo wei ji chu ,tong guo zi zhu she ji de shi yan zhuang zhi ,dui ji jin hang ying li chang zuo yong xia dian zi fu zhao 、ying li chang yu wen du chang zuo yong xia dian zi fu zhao hou sun shang hang wei de yan jiu ,jie shi chu duo chang ou ge zuo yong xia dian zi fu zhao hou bao mo biao mian sun shang ji li he jie gou yan hua gui lv ,shen ru fen xi le ju xian ya an bao mo de la shen xing neng he ying li song chi hang wei deng hong guan xing neng yu wei guan jie gou zhi jian de dui ying guan ji ,bing kao cha le TiO2/ju xian ya an zhong na mi TiO2ceng dui ju xian ya an bao mo dian zi fu zhao hang wei de ying xiang ,wei ju xian ya an bao mo zai fu za de zeng ge huan jing xia de dian zi fu zhao sun shang yu ce di gong li lun he shu ju zhi cheng 。bu tong wai chang tiao jian xia dian zi fu zhao hou ,ju xian ya an mo biao mian chu xian bu tong cheng du de sun shang 。jing dian zi fu zhao zuo yong hou ,ju xian ya an mo biao mian xing cheng bu gui ze de que xian ;jing fu zhao yu ying li chang ou ge zuo yong hou ,ju xian ya an mo de biao mian fa xian le wei lie wen 、qi xi deng sun shang xing mao ;jing fu zhao 、ying li chang he wen du chang de duo chang ou ge zuo yong hou ,bao mo biao mian cheng xian zhi jing wei 50-100 nmde gao mi du li zhuang tu qi de sun shang xing mao 。tong shi ,fu zhao ji fu zhao yu ying li chang ou ge zuo yong hou ,ju xian ya an mo biao mian shu shui xing 、biao mian ying du ji dan xing mo liang xia jiang ;duo chang ou ge zuo yong hou ,ju xian ya an mo biao mian shu shui xing zeng jiang ,biao mian jie chu jiao cong 80°shang sheng zhi 96°,biao mian ying du ji dan xing mo liang fen bie sheng gao le 7.61%he 2.41%。dian zi fu zhao hui yin qi ju xian ya an mo la shen xing neng de xia jiang ,shi yang de la shen jiang du he duan lie shen chang lv jiao yuan shi shi yang fen bie xia jiang le 7.30%he 21.59%;fu zhao yu ying li chang ou ge zuo yong hou ,bao mo fa sheng jia su sun shang ,la shen jiang du he duan lie shen chang lv jiao yuan shi shi yang fen bie xia jiang le 9.90%he 34.08%;duo chang ou ge zuo yong shi ,gao wen huan jing xia de dian zi fu zhao zuo yong yin qi cai liao la shen jiang du chu xian shang sheng qu shi ,ji la shen xing neng de xia jiang cheng du di yu fu zhao yu ying li chang ou ge zuo yong hou de shi yang ,la shen jiang du he duan lie shen chang lv fen bie jiao yuan shi shi yang xia jiang le 5.48%he 31.10%。tong guo yan jiu bu tong wai chang tiao jian xia dian zi fu zhao hou ju xian ya an mo zai 150°Cxia de ru bian ji hui fu hang wei ,jie guo biao ming ,yu yuan shi shi yang xiang bi ,bu tong zuo yong hou bao mo de ru bian ying bian liang jun chu xian xia jiang 。zai jing li fu zhao ji fu zhao yu ying li chang ou ge zuo yong hou ,shi yang de pu dan xing bian bi li xia jiang ,gao dan xing bian ji nian liu xing bian de bi li zeng jia ,ji zhong nian liu xing bian de bi li cong 15.05%fen bie zeng jia zhi 21.64%he 17.59%;duo chang ou ge zuo yong hou ,nian liu xing bian de bi li xia jiang zhi 4.82%,tong shi ,ju xian ya an de ben ti nian du ming xian zeng jia ,gao yu fu zhao ji fu zhao yu ying li chang ou ge zuo yong hou de shi yang ,ju sui fu zhao zhu liang zeng jia biao xian chu xian sheng gao hou xia jiang de yan hua guo cheng 。ci wai ,duo chang ou ge zuo yong shi ,sui fu zhao zhu liang de zeng jia ,cai liao de bo li hua zhuai bian dian fa sheng cong yuan shi de 405.4°Csheng gao zhi 412.5°Czai xia jiang zhi 404.5°Cde bian hua guo cheng 。jing bu tong huan jing de fu zhao zuo yong hou ,cai liao jun ke bao chi jiao hao de re wen ding xing 。shang shu xing neng yan hua gui lv wei ju xian ya an bao mo zai duo chang huan jing zhong ying yong de ke kao xing ji shou ming di gong le you li de shu ju zhi chi 。dian zi fu zhao hui jiang di ju xian ya an fen zi lian jie gou de you xu du ,duo chang ou ge zuo yong dao zhi cai liao nei bu fen zi lian de ju ji tai jie gou zao dao po huai ,bing fa sheng cong ban jie jing tai xiang mo ding xing tai de zhuai bian 。fu zhao zuo yong xia ,ju xian ya an de zhu lian ji ce ji de hua xue jian duan lie ,fan ying cheng du sui fu zhao zhu liang zeng jia er zhu jian jia jiang ;fu zhao yu ying li chang de ou ge zuo yong hui jia su C=Ohe NH2ji de jiang jie fan ying ;duo chang ou ge tiao jian xia wen du sheng gao cu jin cai liao nei bu jiao lian ,bing fa sheng ben huan kai huan ji biao mian yang hua deng fu za hua xue fan ying ,bao mo zhong xin sheng cheng le zhi fang zu C-Cjian he da liang de C≡Njian ,biao ceng de han yang ji tuan wei xin sheng cheng de zhi fang zu mi CH2-Ojian 。ji yu shang shu yan jiu ,ben wen zai ju xian ya an biao mian zhi bei gao wen ding xing na mi TiO2ceng ,bing fen xi chen ji ceng dui ju xian ya an bao mo dian zi fu zhao hang wei de ying xiang 。TiO2/ju xian ya an zai jing li dian zi fu zhao hou ,TiO2ceng de cun zai dui ji de ju xian ya an qi dao fang hu zuo yong ,jian shao le fu zhao dai lai de biao mian que xian ji la shen xing neng de lie hua 。yu ci tong shi ,fu zhao hou chen ji ceng TiO2fa sheng le Ti-O-Tihe Ti-O-Njian de sun shang ji N-Ojian de sheng cheng ,er ji de ju xian ya an zhong tang ji de sun shang cheng du jiang di 。fu zhao yu ying li chang ou ge zuo yong xia TiO2zao dao sun shang ,dao zhi fang hu xiao guo xia jiang 。
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论文作者分别是来自哈尔滨工业大学的董珊珊，发表于刊物哈尔滨工业大学2019-12-07论文，是一篇关于聚酰亚胺论文,辐照论文,损伤论文,多场耦合论文,化学键断裂论文,纳米层论文,哈尔滨工业大学2019-12-07论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自哈尔滨工业大学2019-12-07论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：聚酰亚胺论文; 辐照论文; 损伤论文; 多场耦合论文; 化学键断裂论文; 纳米层论文; 哈尔滨工业大学2019-12-07论文;