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等规聚苯乙烯单链单晶的结构和耐辐照性能

Structure of single-chain single crystals of isotatic polystyrene and their radiation resistance

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【作者】 卜海山曹杰许胜勇张泽

【Author】 Bu Haishan; Cao Jie; Xu Shengyong(Fudan University)Zhang Ze(Beijing Laboratory of Electronic Microscopy, Chinese Academy of Scineces)

【机构】 复旦大学中国科学院北京电子显微镜实验室

【摘要】 利用电子衍射(ED)和高分辨电子显微(HREM)技术,研究等规聚苯乙烯(i-PS)单链单晶的结构.纳米级的单链单晶具有很强的耐电子辐照性能.按照i-PS的晶胞能对ED图中的衍射环和HREM像中的晶格条纹进行晶面指标化,但发现低指数衍射缺失.由于单链单晶的尺寸很小,电子辐照所产生的次级电子可以逸出晶体,使辐照损伤大大减小.另外,单链单晶存在着较少的低指数晶面,未能产生足够的衍射强度,使低指数晶面的衍射缺失.单链单晶对电子辐照稳定,在室温下,可得到高分辨晶格条纹象,这为研究高分子晶体的结构开辟了新的实验方法.

【Abstract】 The structure of the single-chain single crystals of isotactic polystyrene (i-PS)was investigated by electron diffraction (ED) and high resolution electron microscopy(HREM ). The nanoscale single-chain single crystals were found to be very stable to electronirradiation. According to the unit cell of i-PS crystals, the reflection rings in ED pattern andthe lattice fringes in HREM images could be indexed, but the lower-index diffractions werenot found. It is proposed that the single-chain single crystals are very small, thus secondaryelectrons may be allowed to escape and radiation damage is highly reduced, and that there areless lower-index lattice planes in the single-chain single crystals to provide sufficient diffraction intensity for recording. HREM images can be achieved at room temperature in the caseof single-chain single crystals because of its stability to electron irradiation, therefore, thismight be a novel experimental approach to the study of crystal structure of macromolecules.

【基金】 国家基础性研究重大关键项目;国家自然科学基金
  • 【文献出处】 复旦学报(自然科学版) ,JOURNAL OF FUDAN UNIVERSITY , 编辑部邮箱 ,1997年04期
  • 【分类号】O75
  • 【被引频次】3
  • 【下载频次】200
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