Seawater accelerated ageing of poly(3-hydroxybutyrate-co-3-hydroxyvalerate

Type Article
Date 2014-07
Language English
Author(s) Deroine Morgan1, Le Duigou Antoine1, Corre Yves-Marie1, Le Gac Pierre-YvesORCID2, Davies PeterORCID2, Cesar Guy3, Bruzaud Stephane1
Affiliation(s) 1 : Univ Bretagne Sud, Lab Ingn Mat Bretagne LIMATB, F-56321 Lorient, France.
2 : IFREMER, Ctr Bretagne, Marine Struct Grp, F-29280 Plouzane, France.
3 : Univ Bretagne Sud, SERPBIO, F-56321 Lorient, France.
Source Polymer Degradation And Stability (0141-3910) (Elsevier Sci Ltd), 2014-07 , Vol. 105 , P. 237-247
DOI 10.1016/j.polymdegradstab.2014.04.026
WOS© Times Cited 24
Keyword(s) Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), Accelerated ageing, Hydrothermal degradation, Seawater
Abstract The aim of this study is to establish a baseline for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) lifetime prediction in a marine environment, by means of mechanical and physico-chemical characterization of specimens immersed in continuously renewed and filtered natural seawater in the laboratory at different temperatures (4, 25 and 40°C). Samples were also aged at sea in Lorient harbour in order to compare laboratory and natural degradation mechanisms and kinetics. Due to its morphology, hydrolysis of PHBV in natural seawater is quite slow, and samples were observed to undergo preferentially an enzymatic surface degradation. Increasing the aging temperature in the laboratory promotes the water uptake and causes hydrolysis. As two degradation mechanisms occur in parallel, the choice of test conditions is critical, and the lifetime of PHBV in a marine environment is difficult to predict accurately.
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