Understanding the mechanical and biodegradation behaviour of poly(hydroxybutyrate)/rubber blends in relation to their morphology


Autoria(s): Calvao, Patricia S.; Chenal, Jean-Marc; Gauthier, Catherine; Demarquette, Nicole R.; Bogner, Agnes; Cavaille, Jean Yves
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

01/11/2013

01/11/2013

2012

Resumo

In this work poly(hydroxybutyrate/poly(vinyl butyral)- co-(vinyl alcohol)-co(vinyl acetate) (or ethylene propylene diene monomer rubber) blends were prepared by conventional processing techniques (extrusion and injection moulding). A droplet type morphology was obtained for P(3HB)/PVB blends whereas P(3HB)/EPDM blends presented some extent of co-continuous morphology. In addition, rubbery domains were much smaller in the case of PVB. These differences in morphology are discussed taking into account solubility parameters and rheological behaviours of each component. For both blends, the increase of elastomer ratio led to a decrease of Young's modulus but an increase in elongation at break and impact strength. The latter increased more in the case of P(3HB)/EPDM blends although the rubbery domains were larger. These results are explained in the light of the glass transition of the rubber and the presence of plasticizer in the case of PVB. The addition of elastomer also resulted in an increase of P(3HB) biodegradation rate, especially in the case of EPDM. It is assumed that, in this case, the size and morphology of the rubbery domains induce a geometrical modification of the erosion front which leads to an increase of the interface between P(3HB) phase and the degradation medium and consequently to an apparently faster biodegradation kinetics of PHB/rubber blends. Copyright (C) 2011 Society of Chemical Industry

FAPESP

FAPESP

CAPES

CAPES

CNPq

CNPq

Identificador

POLYMER INTERNATIONAL, MALDEN, v. 61, n. 3, supl. 1, Part 6, pp. 434-441, MAR, 2012

0959-8103

http://www.producao.usp.br/handle/BDPI/37314

10.1002/pi.3211

http://dx.doi.org/10.1002/pi.3211

Idioma(s)

eng

Publicador

WILEY-BLACKWELL

MALDEN

Relação

POLYMER INTERNATIONAL

Direitos

restrictedAccess

Copyright WILEY-BLACKWELL

Palavras-Chave #POLY(HYDROXYBUTYRATE) #RUBBER BLENDS #MICROSTRUCTURE #MECHANICAL PROPERTIES #BIODEGRADATION #POLYMER BLENDS #BACTERIAL POLY <(R)-3-HYDROXYBUTYRATE> #CRYSTALLIZATION PHENOMENA #POLY(ETHYLENE OXIDE) #POLY(3-HYDROXYBUTYRATE) #DEGRADATION #PHASE #CRYSTALLINITY #TEMPERATURE #MISCIBILITY #POLYMER SCIENCE
Tipo

article

original article

publishedVersion