Melt Rheology of Poly(L-lactic Acid) Hybrids with Mesoporous Hollow Silica Nanospheres

초록

A positively charged poly(styrene-co-butyl acrylate-co-2-methacryloxyethyltrimethyl ammonium chloride) (PSBM) copolymer was synthesized as a thermal sacrificial core-template via soap-free emulsion copolymerization. With cetyltrimethylammonium bromide (CTAB), PSBM@surfactant/silica core-shell nanocomposites with uniform shell thickness formed through charge density matching between tetraethyl orthosilicate (TEOS) and self-assembly. Thermal decomposition resulted in mesoporous hollow silica nanospheres. These nanospheres were functionalized using coupling agents and incorporated into poly(L-lactic acid) (PLA) matrices, significantly enhancing the mechanical and rheological properties of PLA. Compared to pure PLA, the composites exhibited improved Young's modulus, tensile strength, and toughness. Rheological analysis confirmed the formation of a stable filler network, with increased storage modulus and relaxation time. The Carreau-Yasuda model confirmed the absence of phase separation and the formation of a stable 3D network.

키워드