In this study, the effects of component pair miscibility and mixing sequence on the phase structure of ternary blends of polycarbonate (PC), styrene-acrylonitrile (SAN), and poly(methyl methacrylate) (PMMA), and their composites with multi-walled carbon nanotubes (MWCNTs) were investigated. SAN phase was surrounded by a layer of PMMA in the PC matrix and the thickness of the shell was dependent on the content of acrylonitrile (AN) in SAN (24% vs. 32%). It was established that the miscibility between SAN and PMMA affects the shell thickness on the merging of SAN and PMMA domains, which were separately dispersed at the early stage of kneading section in a twin-screw extruder. Consequently, the PMMA shell around the SAN was thinner in the SAN24, which is miscible with PMMA. When the pre-compounded composites of SAN/PMMA/MWCNT were mixed with PC through a 2-step blending, shell formation was promoted only with SAN32, which is immiscible with PMMA at a processing temperature. Additionally, it was established during the 2-step blending that the MWCNTs pre-dispersed in SAN and PMMA were transferred to the PC phase. This migration behavior of MWCNTs was prevented by introducing viscous impact modifiers. The change in electrical resistivity of the composites was explained using the observed phase morphology.

在本研究中，组分对混溶性和混合顺序对聚碳酸酯 (PC)、苯乙烯-丙烯腈 (SAN) 和聚甲基丙烯酸甲酯 (PMMA) 三元共混物及其多壁复合材料的相结构的影响碳纳米管（MWCNT）进行了研究。SAN 相被 PC 基质中的一层 PMMA 包围，壳的厚度取决于 SAN 中丙烯腈 (AN) 的含量（24% 对 32%）。已确定 SAN 和 PMMA 之间的混溶性影响 SAN 和 PMMA 域合并时的壳厚度，这些域在双螺杆挤出机中捏合段的早期阶段分别分散。因此，SAN24 中围绕 SAN 的 PMMA 外壳更薄，可与 PMMA 混溶。当 SAN/PMMA/MWCNT 的预复合复合材料通过 2 步混合与 PC 混合时，仅使用 SAN32 促进壳的形成，SAN32 在加工温度下与 PMMA 不混溶。此外，在两步混合过程中，预先分散在 SAN 和 PMMA 中的 MWCNT 被转移到 PC 相。MWCNT 的这种迁移行为是通过引入粘性冲击改性剂来防止的。使用观察到的相形态来解释复合材料电阻率的变化。MWCNT 的这种迁移行为是通过引入粘性冲击改性剂来防止的。使用观察到的相形态来解释复合材料电阻率的变化。MWCNT 的这种迁移行为是通过引入粘性冲击改性剂来防止的。使用观察到的相形态来解释复合材料电阻率的变化。