用固体^(13)C-NMR表征丙烯酸酯类抗冲型改性剂的核壳结构

Characterization of core-shell structure of acrylic resin impact modifier by ^(13)C-NMR

采用固体13C-NMR对具有核壳结构的丙烯酸酯类抗冲型改性剂(ACR)中的聚甲基丙烯酸甲酯(PMMA)进行了测试。结果表明,ACR中聚丙烯酸丁酯(PBA)核与PMMA壳具有良好的相容性并形成了中间相,由PMMA旋转坐标系中自旋晶格弛豫时间得出PMMA中间相占总PMMA的摩尔分数为23%,由自旋-自旋作用时间得出PMMA中间相与非中间相摩尔比为3/7。

13C-NMR analysis of poly(methyl methacrylate)(PMMA) in acrylic imp ac t modifier indicated that core of poly(butyl acrylate) and shell of PMMA showed good compatibility and a sort of interphase was developed.The result inferred by spin-lattic relaxation in the rotating frame suggested that the total mass fra ction of PMMA in the interphase was about 23%,and the ratio of PMMA in interpha se and non-interphase was 3/7 according to spin-spin interaction.