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测定了 SBR- g- S的接枝率 ,用 TEM检测了粉末 SBR- g- S(PR)的相结构。用 DSC测定了 PS/ PR共混体的Tg,研究了 PS/ PR共混体的相容性。结果发现 ,在接枝率为 32 .6 %的粉末非交联 SBR- g- S(PR1 )的相结构中 SBR为连续相 ,在连续相中均匀分布着直径约 0 .0 1μm的 PS微区 ;PS为细胞状分散相 ,粒径 1～ 5μm,分散相含有SBR包藏物。在接枝率为 8.5 %的粉末交联 SBR- g- S(PR2 )的相结构中 PS为连续相 ,SBR为分散相 ,分散相粒径约0 .3μm。共混体 PS/ PR1 的相容性优于 PS/ PR2 。 SBR在 PS富相中有较高的含量是导致 PS/ PR1 共混体在冲击断裂时发生剪切屈服的主要原因。
The grafting degree of SBR-g-S was measured and the phase structure of SBR-g-S (PR) powder was examined by TEM. The Tg of PS / PR blend was measured by DSC, and the compatibility of PS / PR blends was studied. The results showed that in the phase structure of powder non-crosslinked SBR-g-S (PR1) with a grafting ratio of 32.6%, SBR was a continuous phase with uniformly dispersed PS micro-particles Area; PS is a cell-like dispersed phase, particle size 1-5μm, dispersed phase containing SBR occlusion. In the phase structure of the powder cross-linked SBR-g-S (PR2) with a grafting rate of 8.5%, PS was the continuous phase, the SBR was the dispersed phase, and the dispersed phase was about 0.3 μm. The compatibility of blend PS / PR1 is better than that of PS / PR2. The higher content of SBR in the PS rich phase is the main reason for the shear yielding of PS / PR1 blends under impact fracture.