Critical Stress for Crystal Transition in Poly(butylene succinate)-Based Crystalline鈥揂morphous Multiblock Copolymers

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• 作者：Guoming Liu ; Liuchun Zheng ; Xiuqin Zhang ; Chuncheng Li ; Dujin Wang
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：November 11, 2014
• 年：2014
• 卷：47
• 期：21
• 页码：7533-7539
• 全文大小：469K
• ISSN：1520-5835

文摘

Multiblock copolymers consisting of crystalline poly(butylene succinate) and amorphous poly(1,2-propylene succinate) (PBS-co-PPS) are synthesized. The microstructure of the materials is investigated by the combination of thermal analysis and wide-angle/small-angle X-ray scattering (WAXS/SAXS). The noncrystalline PPS blocks are found to locate predominately in the amorphous phase between crystalline lamellae of PBS. By means of in situ WAXS coupled with optical-assisted strain measurement, the deformation process of PBS-co-PPS is studied. The stiffness and strength of PBS-co-PPS decrease with increasing PPS fraction, while the strain recovery behavior of PBS-co-PPS is similar to PBS homopolymer. Transition from 伪 crystal to 尾 crystal is observed for all the PBS-co-PPS samples. The critical stress for 伪鈥撐?transition of PBS-co-PPS is determined, which is found to be independent of PPS blocks. The universal critical stress for crystal transition is interpreted through a single-microfibril-stretching mechanism.