Melt-spun microbial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) fibers with enhanced toughness: Synergistic effect of heterogeneous nucleation, long-chain branching and drawing process
Melt-spun microbial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) fibers with enhanced toughness: Synergistic effect of heterogeneous nucleation, long-chain branching and drawing process
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具有增强韧性的熔纺微生物聚（3-羟基丁酸酯-co-3-羟基戊酸酯）纤维：异质成核、长链支化和拉伸工艺的协同效应
DOI：
10.1016/j.ijbiomac.2018.09.063
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发表时间：
2019
影响因子：
8.2
通讯作者：
Meifang Zhu
中科院分区：
文献类型：
--
作者：
Hengxue Xiang;Ziye Chen;Nan Zheng;Xuzhen Zhang;Liping Zhu;Zhe Zhou;Meifang Zhu
以二硫化钨(WS2)为异相成核剂，以过氧化二异丙苯(DCP)为引发剂，采用熔融反应法制备了聚(3-羟基丁酸酯-3-羟基戊酸酯)(PHBV)复合纤维。与PHBV型或PHBV型WS2纤维相比，由于异相成核、长链支化结构和拉伸诱导结晶的协同作用，LCB-PHBV型WS2纤维具有较好的力学性能、较高的成核温度和较快的结晶速率。以20 °C/m in的降温速率为例，LCB-PHBv/1.0wt%WS2的结晶峰温度从100.47 °C提高到107.40 °C，结晶热焓从87.95 J/g增加到93.03 J/g，并且随着拉伸倍数的增加，纤维中有α结晶和β结晶两种不同的结晶形式，β结晶部分增加，增强了纤维的强度。使LCB-PHBVWS2纤维的拉伸强度和断裂伸长率分别达到189.8 MPa和46.5%。
A series of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) composite fibers were prepared via melt reactive processing where tungsten disulphide (WS2) and dicumyl peroxide (DCP) was used as heterogeneous nucleating agent and initiator, respectively. Compared with PHBV or PHBV/WS2fiber, the resultant LCB-PHBV/WS2fibers showed improving mechanical performance, a higher nucleation temperature and a rapid crystallization rate due to the synergistic effect between heterogeneous nucleation, long chain branched structure and draw-induced crystallization. Taking the results with a cooling rate of 20 °C/min as an example, the peak crystallization temperature of LCB-PHBV/1.0 wt%WS2increased from 100.47 °C to 107.40 °C and the crystallization enthalpy increased from 87.95 J/g to 93.03 J/g. Moreover, two different crystalline forms,α-crystal andβ-crystal, were found in the prepared PHBV fibers, and theβ-crystal part increased with the inducement of the stretching ratio which enhanced the fiber strength, given the tensile strength and elongation at break of the LCB-PHBV/WS2fibers up to 189.8 MPa and 46.5%, respectively.