The effect of UV light on polylactide/poly(methyl methacrylate) (PLA/PMMA) blends produced by melt-extrusion with a special emphasis on the peculiar influence of PLA stereocomplexes on the photochemical behavior of the blends is the focus of this paper. Stereocomplexable PLA have been prepared by melt-blending of high-molecular-weight poly(l-lactide) (PLLA), poly(d-lactide) (PDLA) and PMMA. The photochemical behavior of resulting PLA/PMMA blends was studied by irradiation under photooxidative conditions (λ > 300 nm, temperature of 70 °C and in the presence of oxygen). The chemical modifications induced by UV light irradiation were analyzed using infrared spectroscopy (IR) and size exclusion chromatography (SEC). Morphological changes were studied by differential scanning calorimetry (DSC) and atomic force microscopy (AFM). It was shown that PDLA and PMMA don't affect the rate of photooxidation of PLLA. However, PLA stereocomplexes have a strong impact on the morphology of the blends during photochemical ageing.

紫外线对熔融挤出生产的聚丙交酯/聚（甲基丙烯酸甲酯）（PLA / PMMA）共混物的影响，特别是对PLA立体配合物对共混物光化学行为的特殊影响，是本文的重点。通过将高分子量聚（l-丙交酯）（PLLA），聚（d-丙交酯（PDLA）和PMMA。通过在光氧化条件下（λ> 300 nm，温度为70°C，在有氧的情况下）进行辐照，研究了所得PLA / PMMA共混物的光化学行为。使用红外光谱（IR）和尺寸排阻色谱（SEC）分析了由紫外线照射引起的化学修饰。通过差示扫描量热法（DSC）和原子力显微镜（AFM）研究了形态变化。结果表明，PDLA和PMMA不会影响PLLA的光氧化速率。但是，PLA立体配合物在光化学老化过程中对共混物的形态有很大影响。