Three flame-retarded systems based on PLA, PMMA and PLA/PMMA blend have undergone hydrothermal ageing. The miscibility of the blend as well as the crystallization behaviour of PLA were studied by DSC. The impact of ageing in terms of weight variations, melt viscosity, molecular weight distribution, morphology, and thermal degradation was investigated. Results showed that crystallization of PLA and significant hydrolysis phenomenon occurred during ageing. Flame retardant content determined by EDX and ICP revealed a loss of phosphorus during ageing, especially for flame-retarded PLA (91 wt% phosphorus loss after ageing). Incorporation of 50 wt% PMMA moderated the negative impacts observed. Fire properties evaluated using cone calorimeter revealed almost no impact of ageing on flame-retarded PMMA, contrary to flame-retarded PLA (increase of pHRR from 291 to 487 kW/m²). Flame-retarded blend shows intermediate properties. It revealed the positive effect of incorporation of PMMA in PLA, by limiting the water diffusion and by reducing the loss of phosphorus.

基于PLA，PMMA和PLA / PMMA共混物的三种阻燃系统已经过水热老化。DSC研究了共混物的可混溶性以及PLA的结晶行为。研究了老化对重量变化，熔体粘度，分子量分布，形态和热降解的影响。结果表明，PLA的结晶和老化过程中均发生明显的水解现象。由EDX和ICP测定的阻燃剂含量显示出在老化过程中磷的流失，尤其是对于阻燃的PLA（老化后磷流失率为91 wt％）。掺入50重量％的PMMA减轻了所观察到的负面影响。使用锥形量热仪评估的燃烧性能显示，老化对阻燃的PMMA几乎没有影响，²）。阻燃共混物显示出中间性质。它揭示了通过限制水扩散和减少磷的损失，将PMMA掺入P​​LA的积极作用。