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Processing of poly(hydroxybutyrate-co-hydroxyvalerate)-based bionanocomposite foams using supercritical fluids

Published online by Cambridge University Press:  22 March 2012

Alireza Javadi ,
Yottha Srithep ,
Craig C. Clemons ,
L-S. Turng  and
Shaoqin Gong
Alireza Javadi
Affiliation:
Department of Biomedical Engineering; and Wisconsin Institute for Discovery, University of Wisconsin–Madison, Madison, Wisconsin 53715
Yottha Srithep
Affiliation:
Department of Mechanical Engineering, University of Wisconsin–Madison, Madison, Wisconsin 53715
Craig C. Clemons
Affiliation:
Forest Products Laboratory, United States Department of Agriculture, Madison, Wisconsin 53715
L-S. Turng*
Affiliation:
Department of Mechanical Engineering; and Wisconsin Institute for Discovery, University of Wisconsin–Madison, Madison, Wisconsin 53715
Shaoqin Gong*
Affiliation:
Department of Biomedical Engineering; and Wisconsin Institute for Discovery, University of Wisconsin–Madison, Madison, Wisconsin 53715
*
a)Address all correspondence to these authors. e-mail: turng@engr.wisc.edu
b)e-mail: sgong@engr.wisc.edu.
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Abstract

Supercritical fluid (SCF) N2 was used as a physical foaming agent to fabricate microcellular injection-molded poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV)–poly(butylene adipate-co-terephthalate) (PBAT)–hyperbranched-polymer (HBP)–nanoclay (NC) bionanocomposites. The effects of incorporating HBP and NC on the morphological, mechanical, and thermal properties of both solid and microcellular PHBV–PBAT blends were studied. NC exhibited intercalated structures in solid components, but showed a mixture of exfoliated and intercalated structures in the corresponding microcellular nanocomposites. The addition of NC improved the thermal stability of the resulting nanocomposites. The addition of HBP and NC reduced the cell size and increased the cell density of microcellular components. The addition of HBP and NC enhanced the degree of crystallinity for both solid and microcellular components. Moreover, with the addition of HBP, the area under tan δ curve, specific fracture toughness, and strain-at-break of the PHBV-based nanocomposite increased significantly whereas the storage modulus, specific Young’s modulus, and specific tensile strength decreased.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 11 , 14 June 2012 , pp. 1506 - 1517
Copyright
Copyright © Materials Research Society 2012

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