Melt-spun microbial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) fibers with enhanced toughness: Synergistic effect of heterogeneous nucleation, long-chain branching and drawing process

International Journal of Biological Macromolecules
Hengxue XiangMeifang Zhu

Abstract

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/WS2 fiber, the resultant LCB-PHBV/WS2 fibers 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%WS2 increased 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 and β-crystal, were found in the prepared PHBV fibers, and the β-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/WS2 fibers up to 189.8 MPa and 46.5%, respectively.

Citations

Apr 24, 2019·Journal of Biomaterials Science. Polymer Edition·Mădălina Elena GrigoreElena Ramona Andrei
Dec 5, 2019·Bioengineering·Dario PuppiFederica Chiellini
Aug 23, 2019·International Journal of Biological Macromolecules·Asit Baran Samui, Tapan Kanai
Jul 30, 2021·International Journal of Biological Macromolecules·Rajendran MuthurajTizazu H Mekonnen

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