Photooxidation of polylactide/calcium sulphate composites

被引：125
作者：
Gardette, Melanie [1 ,2 ]
Therias, Sandrine [1 ,2 ]
Gardette, Jean-Luc [1 ,2 ]
Murariu, Marius [3 ]
Dubois, Philippe [3 ]
机构：
[1] Univ Blaise Pascal, Clermont Univ, Lab Photochim Mol & Macromol, F-63000 Clermont Ferrand, France
[2] LPMM, CNRS, UMR 6505, F-63173 Aubiere, France
[3] Univ Mons, UMONS & Mat Nova Res Ctr, LPCM, Ctr Innovat & Res Mat & Polymers CIRMAP, B-7000 Mons, Belgium
来源：
POLYMER DEGRADATION AND STABILITY | 2011年 / 96卷 / 04期
关键词：
Biodegradable polyesters; Polylactide; Calcium sulphate anhydrite; Composites; Degradation; UV irradiation; POLY(L-LACTIC ACID); CALCIUM-SULFATE; FILLER CONTENT; PART; DEGRADATION; BIODEGRADABILITY; SIZE;
D O I：
10.1016/j.polymdegradstab.2010.12.023
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Stable CaSO4 beta-anhydrite II (AII), a specific type of dehydrated gypsum and a by-product of the lactic acid (LA) production process, was melt-blended with bio-sourced polylactide (PLA) to produce highly filled composites. Samples containing different amounts of filler (10-40 wt.%) with various granulometries were used for preparation of films by compression moulding. The influence of adding filler (calcium sulphate) on the photochemical behaviour of PLA-AII composites was studied by irradiation under photo-oxidative conditions (lambda > 300 nm, temperature of 60 degrees C and in the presence of oxygen). Several analytical methods were used to characterise the polymer degradation. Oxidation of the polymer matrix was evaluated by infrared and UV-visible spectroscopies, differential scanning calorimetry (DSC) and size exclusion chromatography (SEC). The main photoproducts formed upon UV-light irradiation of the PLA were identified along with the influence of filler content and its particle size on the rate of oxidation. It was shown that oxidation of PLA and PLA-AII composites occurred without any induction time and that the presence of the CaSO4 filler (AII) increased the oxidation rate of the polymer. Moreover, a faster degradation rate of PLA was observed in composites containing natural anhydrite of lower particle size (4 mu m). (C) 2011 Elsevier Ltd. All rights reserved.
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页码：616 / 623
页数：8
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