This work proposed an efficient method to synthesize acrylonitrile-butadiene-styrene (ABS) copolymer and α-Methylstyrene (α-MSt)/N-phenylmaleimide (NPMI)/Acrylonitrile (AN) (MSAMI) random copolymer via emulsion polymerization, aiming to combine the excellent heat resistance of MSAMI and numerous advantages of ABS resin including mechanical properties, processing and recyclability. The effects of the MSAMI content and α-MSt/AN ratio on the thermal performance, mechanical properties and the morphology of heat-resistant ABS were investigated by FITR, dynamic mechanical analyses (DMA), Vicat Softening Temperature (VST), Thermogravimetric Analysis (TGA) and Scanning Electron Microscope (SEM). As a result, the heat-resistant of ABS resin was obviously enhanced by MSAMI, and its glass transition temperature (T_g) could be extended with the increase of NPMI content. The T_g could reach 173°C when NPMI content was 20% at the same trend as the VST. Synthetically, the contradiction between the heat resistance and mechanical properties of ABS resin reached a good balance when the NPMI content was 15% and α-MSt/AN ratio was 69/31. In SEM, the fracture morphology of the heat-resistant ABS resin was gradually tended to be smooth with the increase of the NPMI content. Therefore, the MSAMI random copolymer was successful prepared, which provided insight for the synthesis of heat-resistant modifiers and promoted the potential application of heat-resistant modifiers in automobiles and aircraft.

本工作提出了一种通过乳液聚合合成丙烯腈-丁二烯-苯乙烯（ABS）共聚物和α-甲基苯乙烯（α-MSt）/N-苯基马来酰亚胺（NPMI）/丙烯腈（AN）（MSAMI）无规共聚物的有效方法，旨在结合MSAMI 的优异耐热性和 ABS 树脂的众多优点，包括机械性能、加工和可回收性。通过FITR、动态力学分析（DMA）、维卡软化温度（VST）、热重分析（ TGA) 和扫描电子显微镜 (SEM)。因此，MSAMI 显着提高了 ABS 树脂的耐热性，其玻璃化转变温度（T _g) 可以随着 NPMI 含量的增加而扩展。当 NPMI 含量为 20% 时，T _g可达到 173°C，趋势与 VST 相同。综合来看，当NPMI含量为15%，α-MSt/AN比为69/31时，ABS树脂的耐热性和力学性能之间的矛盾达到了较好的平衡。在SEM中，耐热ABS树脂的断口形貌随着NPMI含量的增加而逐渐趋于平滑。因此，成功制备了MSAMI无规共聚物，为耐热改性剂的合成提供了思路，促进了耐热改性剂在汽车和飞机上的潜在应用。