Linear ladder polysilsesquioxanes (LPSQ-R) bearing fluoroaryl groups [R: p-fluorophenyl (F), p-trifluoromethylphenyl (F₃) or pentafluorophenyl (F₅)] were used to modify polylactide (PLA). Vibrational spectroscopy analysis suggested specific, non-covalent interactions between CO of PLA and fluoroaryl groups of LPSQ-R while quantum-chemical modelling performed for representative models indicated that the pattern of possible preferred contacts differs for LPSQ-F₃ in respect to LPSQ-F and LPSQ-F₅ (H····F hydrogen bonding against n→π* attractive interactions). It may affect interface phenomena in PLA/LPSQ-R systems. Thermal characteristics of PLA/LPSQ-R depended on the type of R and LPSQ-R content. Dielectric relaxation spectroscopy (DRS) studies revealed one relaxation process present in PLA and related to the glass transition. However, for PLA/LPSQ-R blends two processes were identified: glass transition and normal–mode relaxation. The modification with fluorinated macromolecules increased hydrophobicity of amorphous PLA and improved its mechanical and gas barrier properties, which can be of importance for packaging applications.

带有氟芳基[R：对氟苯基（F），对三氟甲基苯基（F ₃）或五氟苯基（F ₅）]的线性梯形聚倍半硅氧烷（LPSQ-R）用于改性聚丙交酯（PLA）。振动光谱分析表明PLA的C O与LPSQ-R的氟芳基之间存在特定的非共价相互作用，而对代表性模型进行的量子化学建模表明，LPSQ-F ₃相对于LPSQ-F ₃而言，可能的优选接触方式有所不同F和LPSQ-F ₅（H····F氢键结合n→π*吸引相互作用）。它可能会影响PLA / LPSQ-R系统中的界面现象。PLA / LPSQ-R的热特性取决于R和LPSQ-R含量的类型。介电弛豫谱（DRS）研究表明PLA中存在一种弛豫过程，与玻璃化转变有关。但是，对于PLA / LPSQ-R共混物，确定了两个过程：玻璃化转变和常模弛豫。用氟化大分子进行的修饰增加了无定形PLA的疏水性并改善了其机械和气体阻隔性能，这对于包装应用而言可能至关重要。