Crystallization-driven self-assembly of isotactic polystyrene in N,N-dimethylformamide |
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Authors: | Qi-hua Zhou Zhi-yun Li Hua-qing Liang Yong-jiang Long Qing Wu Hai-yang Gao Guo-dong Liang Fang-ming Zhu |
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Affiliation: | 1. Key Lab for Polymer Composites and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. Key Lab for Polymer Composites and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;DSAPM Lab, Institute of polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University,Guangzhou 5102 75, China |
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Abstract: | Herein we demonstrate crystallization-driven self-assembly of isotactic polystyrene(i PS) with high isotacticity and narrow molecular weight distribution and crystallization-induced switching of the morphology of i PS aggregates in N, N-dimethylformamide(DMF). The formation and morphology switching of the self-assembled aggregates of i PS are investigated by means of dynamic light scattering(DLS), scanning electron microscopy(SEM), differential scanning calorimetry(DSC) and wide angle X-ray diffraction(WXRD). The results reveal that cooling DMF solution of i PS promotes i PS chains to self-assemble into spherical aggregates with a gelled core cross-linked by microcrystals, which is surrounded by solvent-swollen corona. Furthermore, crystallization induces the deformation of i PS aggregates from spherical to plate-like or nest-like. |
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Keywords: | Isotactic polystyrene N, N-Dimethylformamide Crystallization-driven Self-assembly |
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