期刊
POLYMER DEGRADATION AND STABILITY
卷 127, 期 -, 页码 88-97出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.10.019
关键词
Polylactic acid (PLA); Flame retardancy; Ageing; Degradation; Hydrolysis
Effect of accelerated ageing on neat and flame retarded (FR) polylactide (PLA) has been investigated. The influence of temperature and relative humidity on (i) the visual aspect, (ii) the fire performances, (iii) the molecular mass and (iv) the thermal properties of the formulations has been evaluated. The flame retardant (FR) properties of samples before and after ageing were compared using Limiting Oxygen Index (LOI) and Mass Loss Calorimetry (MLC). It was reported that degradation of PLA, mainly driven by hydrolysis phenomenon, is accelerated in presence of FR fillers (melamine and ammonium polyphosphate). This is even more pronounced when an organomodified montmorillonite is added. However the FR properties are enhanced after ageing due to the physicochemical of the flame retarded materials (e.g. migration of the flame retardants, decrease of the molecular mass...). (C) 2015 Elsevier Ltd. All rights reserved.
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