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基于自由体积理论,利用正电子湮灭寿命谱仪(PALS)分别研究在不同升温速率条件下,聚苯乙烯-甲基丙烯酸甲酯共聚物(SMMA)和聚苯乙烯-马来酸酐共聚物(SMA)混合物(30/70)的自由体积参数的温度依赖性,探索相容共混物相行为的热动态特性.在PALS实验中,在玻璃化转变温度Tg以上,当结构松弛的弛豫时间与等温停留时间相当,发现在某一段温度范围内,共混物的自由体积参数随着温度的变化明显地偏离线性关系.从自由体积孔的浓度I3值在该段的变化趋势,初步推断共混物在该温度段经历了相分离的成长阶段.
Based on the free volume theory, the structures of polystyrene-methyl methacrylate copolymer (SMMA) and polystyrene-maleic anhydride copolymer (SMA) were studied by positron annihilation lifetime spectrometer (PALS) ) Mixture (30/70), and to explore the thermodynamic properties of phase behavior of compatible blends.In the PALS experiment, above the glass transition temperature Tg, when the relaxation time of the structure relaxes to It is found that the free volume parameters of the blends deviate significantly from the linear relationship with the temperature within a certain temperature range.It is preliminarily concluded from the change trend of the I3 value of the free volume pore in this section During this temperature period, the material undergoes the phase of phase separation.