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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
The positron annihilation technique was used to study the free-volume pore size of the in situ blend system of methyl methacrylate-methacrylic acid copolymer (P (MMA-MAA) / trapezoidal polyphenylsilsesquioxane (PPSQ) Relationship between concentration and its composition. The positron lifetime temperature profile of the blend with two different formulations shows that there are two structural transitions for the blend: Tb, Tg, free volume in a blend sample C5 with 5% PPSQ The scores are larger, and the Tp, T are less than the blended samples containing 1% PPSQ. C1. The effect of thermal history on the structure of P (MMA-MAA) / trapezoidal PPSQ blends was investigated. Also found that positron-average life expectancy and free volume fraction have a similar law with temperature