Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, 430062, China.
Laboratory of Reactions and Process Engineering (UMR CNRS 7274), Université de Lorraine, CNRS, ENSIC, Nancy, 54001, France.
Macromol Rapid Commun. 2023 Aug;44(15):e2300141. doi: 10.1002/marc.202300141. Epub 2023 May 28.
In order to get stable co-continuous morphology in immiscible polymer blends, besides reducing the interfacial tension, the compatibilizer should not only promote the formation of flat interface between different phases, but also not hinder the coalescence of the dispersed phase. Herein, the relationship between the morphology of the compatibilized polystyrene/nylon 6/styrene-maleic anhydride (PS/PA6/SMA) immiscible polymer blends and the structures of the in-situ formed SMA-g-PA6 graft copolymers as well as the processing conditions are studied. Two kinds of SMA are used: SMA28 (28 wt.% MAH) and SMA11 (11 wt.% MAH). After melt blending with PA6, the in-situ formed copolymer SMA28-g-PA6 has on average of four PA6 side chains, while that of SMA11-g-PA6 has only one. Dissipative particle dynamics simulation results indicate that both SMA28-g-PA6 copolymer and PS/PA6/SMA28 blends tend to form co-continuous structure, while those related to SMA11 intend to form sea-island morphologies. These results are correct only at relatively low rotor speed (60 rpm). When the rotor speed is higher (105 rpm), sea-island morphologies are obtained in SMA28 systems, while that for SMA11 ones are co-continuous. This indicates that higher shear stress can elongate the minor phase domains to form flat interfaces, while the SMA28-g-PA6 copolymers can be pulled out from the interface.
为了在不相容聚合物共混物中获得稳定的共连续形态，增容剂不仅应促进不同相之间的平坦界面形成，而且不应阻碍分散相的聚结，除了降低界面张力之外。本文研究了相容化聚苯乙烯/尼龙 6/苯乙烯-马来酸酐（PS/PA6/SMA）不相容聚合物共混物的形态与原位形成的 SMA-g-PA6 接枝共聚物的结构以及加工条件之间的关系。使用了两种 SMA：SMA28（28wt.%MAH）和 SMA11（11wt.%MAH）。与 PA6 熔融共混后，原位形成的共聚物 SMA28-g-PA6 的平均有四个 PA6 侧链，而 SMA11-g-PA6 只有一个。耗散粒子动力学模拟结果表明，SMA28-g-PA6 共聚物和 PS/PA6/SMA28 共混物都倾向于形成共连续结构，而与 SMA11 相关的则倾向于形成海-岛形态。这些结果仅在相对较低的转子速度（60rpm）下是正确的。当转子速度较高（105rpm）时，SMA28 体系中得到海-岛形态，而 SMA11 体系则为共连续形态。这表明较高的剪切应力可以拉长次要相畴以形成平坦的界面，而 SMA28-g-PA6 共聚物可以从界面中被拔出。
