Study on positron lifetime spectra of polymethyl methacrylate-methylacrylic acid/ladderlike polyphenylsilsesquioxane in situ blends

LI Guizbi YE M eiling - SHI Lianghe

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Study on positron lifetime spectra of polymethyl methacrylate-methylacrylic acid/ladderlike polyphenylsilsesquioxane in situ blends

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- Study on positron lifetime spectra of polymethyl methacrylate-methylacrylic acid/ladderlike polyphenylsilsesquioxane in situ blends
- NUCLEAR TECHNIQUES Issue 2, (1998)
- 作者机构：
  
  1. 中国科学院化学研究所高分子物理开放实验室
  2. 清华大学
  3. 山东大学化学院
  4. 中国科学院化学研究所高分子物理开放实验室清华大学山东大学化学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL62
- Published：01 February 1998
- 稿件说明：
移动端阅览
[1]李桂芝,叶美玲,施良和,郁伟中.甲基两烯酸甲酯-甲基丙烯酸共聚物/梯形聚苯基硅倍半氧烷原位共混物的正电子寿命谱研究[J].核技术,1998(02):68-73.

LI Guizbi YE M eiling - SHI Lianghe. Study on positron lifetime spectra of polymethyl methacrylate-methylacrylic acid/ladderlike polyphenylsilsesquioxane in situ blends[J]. Nuclear techniques, 1998, (2).
[1]李桂芝,叶美玲,施良和,郁伟中.甲基两烯酸甲酯-甲基丙烯酸共聚物/梯形聚苯基硅倍半氧烷原位共混物的正电子寿命谱研究[J].核技术,1998(02):68-73. DOI：

LI Guizbi YE M eiling - SHI Lianghe. Study on positron lifetime spectra of polymethyl methacrylate-methylacrylic acid/ladderlike polyphenylsilsesquioxane in situ blends[J]. Nuclear techniques, 1998, (2). DOI：

摘要

用正电子湮没技术研究了甲基丙烯酸甲酯－甲基丙烯酸共聚物（Ｐ（ＭＭＡ－ＭＡＡ））／梯形聚苯基硅倍半氧烷（ＰＰＳＱ）原位共混体系的自由体积孔穴尺寸及浓度与其组成的关系。具有两种不同配比的该共混物的正电子寿命温度谱表明：该共混物有两种结构转变，即：Ｔｂ、Ｔｇ，因含５％ＰＰＳＱ的共混试样Ｃ５中的自由体积分数较大，其Ｔｐ、Ｔ均小于含１％ＰＰＳＱ的共混试样．Ｃ１。研究了热历史对Ｐ（ＭＭＡ－ＭＡＡ）／梯形ＰＰＳＱ共混物结构的影响。还发现正电子平均寿命与自由体积分数有着类似的随温度变化的规律

Abstract

Relationship between size or concentration of free-volume cavities in P（MAMMA）/ladderlike PPSQ blends and the composition was studied by the positron annihilation technique. Curves of positron lifetime vs. temperature for the blends with two different composition indicate that there are two structural transitions

Tβ and Tg and that Tβ and T g for sample C5 （5%PPSQ） are lower that those for Sample G1

（1%PPSQ） because Sample C5 has a greater free- volume fraction than Sample C1. Effect of thermal history on the structure of P（MMA- MAA）/PPSQ was also investigated. It is shown that the relation of average lifetime and temperature is similar to that of free-volume fraction and temperature.

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