4.7 Article

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

Journal

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 122, Issue -, Pages 1136-1143

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2018.09.063

Keywords

Polyhydroxyalkanoates; PHBV; Crystallization; Long chain branched; Heterogeneous nucleation; Mechanical property

Funding

  1. National Natural Science Foundation of China [51603033]
  2. Fundamental Research Funds for the Central Universities [2232018D3-03, 2232018A3-01]
  3. Program for Innovative Research Team in University of Ministry of Education of China [IRT16R13]
  4. Open Foundation of Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Education Ministry of China [2017001]

Ask authors/readers for more resources

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 degrees C/min as an example, the peak crystallization temperature of LCB-PHBV/1.0 wt%WS2 increased from 100.47 degrees C to 107.40 degrees C and the crystallization enthalpy increased from 87.95 J/g to 93.03 J/g. Moreover, two different crystalline forms, alpha-crystal and beta-crystal, were found in the prepared PHBV fibers, and the beta-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. (C) 2018 Elsevier B.V. All rights reserved.

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