白忠爱,陈彦模,陈龙,俞昊,朱美芳
BAI Zhong-ai,CHEN Yan-mo,CHEN Long,YU Hao,ZHU Mei-fang(State Key Laboratory for Modification of Chemical Fibers & Polymer Materials

• 1:纤维材料改性国家重点实验室
• 2:东华大学材料学院

摘要(Abstract)：

β-羟基丁酸-羟基戊酸共聚物(PHBV)初生纤维存放过程中,其力学行为存在明显的演变过程:初生纤维在固体状态表现出由弹性行为为主向塑性行为为主的转变直至最后表现为脆性体特征。为了探究这一特有力学演变的聚集态结构致因,对力学演变的整个过程做了详尽跟踪,并对此过程中纤维内部聚集态结构(包括结晶和取向)的相应变化做了同步测试。结果发现,在初生纤维力学性能发生巨大变化的同时,纤维的结晶度和取向度也有了很大提高,但WXRD图谱显示纤维的晶态结构没有明显改变。由于PHBV在室温下存在二次结晶,还探讨了二次结晶对无定形区的作用及对力学演变的影响。认为在纤维存放过程中,由于二次结晶造成的结晶度(包括晶粒的大小和完善程度)和取向度增大是PHBV纤维变脆的原因。
There is an obvious mechanical evolution process for the as-spun poly(β-hydroxybutyrate-co-hydroxyvalerate)(PHBV)fiber during storage.In order to explore the polymeric structural cause for this unique mechanical evolution,a detailed tracking had been done to the entire process.Meanwhile,the corresponding changes in the inner polymeric structure,including crystallization and orientation,were synchronously tested.The results showed that while the mechanical properties of the as-spun fiber experienced tremendous changes,the degree of crystallization and orientation was also greatly increased,but WXRD revealed that the crystalline structure of fiber did not change significantly.In particular,because PHBV had a second crystallization at room temperature,the paper also discussed the effects of secondary crystallization on the amorphous area and the mechanical evolution accordingly.The author believed that the elevation of degree of crystallization and orientation and the constraints imposed on the amorphous area,as a result of secondary crystallization,were the reasons for the embrittlement of PHBV fiber.

关键词(KeyWords)： β-羟基丁酸-羟基戊酸共聚物;初生纤维;力学演变
poly(β-hydroxybutyrate-co-hydroxyvalerate),as-spun fiber,mechanical evolution

Abstract:

Keywords:

基金项目(Foundation): 上海市曙光跟踪计划(06GG08)项目

作者(Author): 白忠爱,陈彦模,陈龙,俞昊,朱美芳
BAI Zhong-ai,CHEN Yan-mo,CHEN Long,YU Hao,ZHU Mei-fang(State Key Laboratory for Modification of Chemical Fibers & Polymer Materials

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