Protection of Flax/PLLA Biocomposites from Seawater Ageing by External Layers of PLLA

Type Publication
Date 2011
Language English
Copyright 2011 A. Le Duigou et al.
Author(s) Le Duigou A.1, Deux J. M.1, Davies PeterORCID2, Baley C.1
Affiliation(s) 1 : LIMATB, Equipe Polymeres & Composites, Lab Ingn Mat Bretagne, F-56321 Lorient, France.
2 : IFREMER, Ctr Brest, Mat & Struct Grp, F-29280 Plouzane, France.
Source International Journal Of Polymer Science (1687-9422) (Hindawi Publishing Corporation), 2011 , N. 235805 , P. 1-8
DOI 10.1155/2011/235805
WOS© Times Cited 1
Abstract Biocomposites are sensitive to water, and previous work on flax reinforced PLLA showed a large drop in mechanical properties after immersion (Le Duigou et al. 2009). Unreinforced PLLA was much less sensitive. This paper presents a strategy to reduce the influence of wet ageing by adding extra layers of PLLA on the biocomposite surface. Weight gain measurements show that a PLLA coating 350 um thick reduces weight gain by half, and biocomposite stiffness and strength after ageing are improved by 100% compared to uncoated composite behaviour. Thermal analysis and microscopic examination are used to show damage mechanisms with and without protection. Property changes are shown to be quasilinearly related to weight gain.
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