| 聚苯乙烯胶乳颗粒的成膜过程及尺寸效应 |
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| 引用本文： | 屈小中,史燚,陈柳生,金熹高.聚苯乙烯胶乳颗粒的成膜过程及尺寸效应[J].高等学校化学学报,2003,24(5):943-945. |
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| 作者姓名： | 屈小中 史燚 陈柳生 金熹高 |
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| 作者单位： | 中国科学院化学研究所分子科学中心高分子物理与化学国家重点实验室, 北京 100080 |
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| 基金项目： | 国家自然科学基金(批准号:20004011,20023003)，科学技术部攀登计划(批准号:95-11)资助 |
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| 摘 要： | 聚合物乳液成膜过程可分为介质蒸发、颗粒形变和相邻颗粒间高分子的扩散融合三个阶段.一般认为,环境温度达到或高于高分子的玻璃化转变温度(Tg)时颗粒才可能发生形变.Goudy等研究了粒径为0.24～1.05μm的聚苯乙烯(PS)胶乳的成膜过程,发现PS颗粒在368K(Tg约373K)热处理很长时间也不发生形变,而在378K热处理后,粒径较小的颗粒融合速度快于较大颗粒.
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| 关 键 词： | 聚苯乙烯胶乳 成膜过程 尺寸效应 |
| 文章编号： | 0251-0790(2003)05-0943-03 |
| 收稿时间： | 2002-01-17 |
Particle Size Effect on the Filming Process of Polystyrene Latex |
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| QU Xiao-Zhong,SHI Yi,CHEN Liu-Sheng,JIN Xi-Gao.Particle Size Effect on the Filming Process of Polystyrene Latex[J].Chemical Research In Chinese Universities,2003,24(5):943-945. |
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| Authors: | QU Xiao-Zhong SHI Yi CHEN Liu-Sheng JIN Xi-Gao |
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| Institution: | State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | The film formation process of micro-PS particles (diameter 742 nm) and nano-PS particles (diameter 29 nm) was studied by means of AFM and DSC. During a step heating process, the particles were annealed for 0. 5 h at each selected temperature. It is found that the deformation and interdiffusion temperatures are ca. 393-403 K and 413-423 K for the micro-PS particles, 363 K and 373-383 K for the nano-PS particles respectively. Comparing to the micro-PS particles, the sintering process of nano-PS particles occurs at much lower temperature determined by the confined state of polymer chains with less interactions between segments, leading to a higher conformational energy, and completed in much narrower temperature range driven mainly by the larger total surface energy. |
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| Keywords: | Polystyrene latex Filming process Particle size effect |
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