不混溶聚合物共混物的共连续形态与原位形成的接枝共聚物结构之间的关系,Macromolecular Rapid Communications

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不混溶聚合物共混物的共连续形态与原位形成的接枝共聚物结构之间的关系
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2023-05-21 , DOI: 10.1002/marc.202300141
Tianqi Liang ₁ , Qiwen Huang ₁ , Zhaoyang Wei ₁ , Weiwei Lei ₁ , Jun You ₁ , Jie Liu ₁ , Xiaoming Ren ₁ , Qunchao Zhang ₁ , Guohua Hu ₂ , Dean Shi ₁

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为了在不混溶的聚合物共混物中获得稳定的共连续形态，除了降低界面张力外，增容剂不仅应促进不同相之间形成平坦界面，而且不能阻碍分散相的聚结。本文研究了增容聚苯乙烯/尼龙6/苯乙烯-马来酸酐(PS/PA6/SMA)不混溶聚合物共混物的形貌与原位形成的SMA-g-PA6接枝共聚物的结构之间的关系以及加工过程。条件进行了研究。使用两种 SMA：SMA28（28 wt.% MAH）和 SMA11（11 wt.% MAH）。与PA6熔融共混后，原位形成的共聚物SMA28-g-PA6平均具有4个PA6侧链，而SMA11-g-PA6只有1个侧链。耗散粒子动力学模拟结果表明，SMA28-g-PA6共聚物和PS/PA6/SMA28共混物倾向于形成共连续结构，而与SMA11相关的那些倾向于形成海岛形貌。这些结果仅在相对较低的转子速度 (60 rpm) 下才是正确的。当转子速度较高（105 rpm）时，SMA28 系统获得海岛形貌，而 SMA11 系统则获得共连续形貌。这表明较高的剪切应力可以拉长次要相域以形成平坦的界面，而SMA28-g-PA6共聚物可以从界面中拉出。

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Relationship between the Co-Continuous Morphology of Immiscible Polymer Blends and the Structure of an In Situ Formed Graft Copolymer

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.

更新日期：2023-05-21

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