Tunable monoenergy positron annihilation spectroscopy of polyethylene glycol thin films

被引：7

作者：

Kuang, Peng ^{[1
,2
]}

Han, Xiao-Long ^{[3
]}

Cao, Xing-Zhong ^{[1
]}

Xia, Rui ^{[1
]}

Zhang, Peng ^{[1
]}

Wang, Bao-Yi ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Northwest Univ Xian, Sch Chem Engn, Xian 710069, Peoples R China

来源：

CHINESE PHYSICS B | 2017年 / 26卷 / 05期

基金：

中国国家自然科学基金;

关键词：

slow positron; coincidence Doppler broadening; micro-structure; polyethylene glycol membranes; FREE-VOLUME-HOLES; FINE-STRUCTURE; MEMBRANES; POLYMERS; PERVAPORATION; POLYPROPYLENE; ETHANOL; BEAMS; PROBE;

D O I：

10.1088/1674-1056/26/5/057802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Doppler broadening and coincidence Doppler broadening of annihilation radiation experiments have been performed in three kinds of polyethylene glycol (PEG) membrane formed with different average molecular weight using the tunable monoenergy slow positron probe as a function of implantion energy. The obtained positron annihilation parameters are interpreted from two aspects: surface effect and differences in micro-structure or chemical environment of positron annihilation. The experimental results show that the regulation of densification of PEG molecular packing and distribution uniformity from the near surface layer to the bulk region in the film forming process can be well realized by changing its molecular weight. Combining a variable monoenergetic slow positron beam and these two positron annihilation spectroscopy methods is a powerful tool to study positron annihilation characteristics and for polymeric thin-film fine structure analysis.

引用

页数：5

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