材料科学
流变学
己二酸
纳米-
退火(玻璃)
化学工程
体积分数
形态学(生物学)
相(物质)
复合材料
有机化学
化学
遗传学
生物
工程类
作者
Ebrahim Jalali Dil,Nick Virgilio,Basil D. Favis
标识
DOI:10.1016/j.eurpolymj.2016.07.022
摘要
This work studies the effect of the interfacial assembly of spherical nano-silica particles on the morphology, rheology and mechanical properties of heterophase poly(lactic acid), PLA, and poly(butylene adipate-co-terephthalate), PBAT, blends. Through a controlled mixing strategy, nano-silica particles could be assembled in a stable fashion at the PLA-PBAT interface. Rheological analysis indicates that the interfacial assembly of nano-silica significantly diminishes the relaxation of the dispersed PBAT phase and 3 wt.% of nano-silica particles shifts the co-continuity region to a lower PBAT volume fraction. At co-continuity, the assembly of nano-silica at the interface changes the rheological behaviour of the co-continuous PLA/PBAT from a liquid-like to a gel-like behaviour. The interfacial assembly of nano-silica reduces the co-continuous phase size but maintains co-continuity. The results of thermal annealing indicate a remarkable stabilization effect of interfacially assembled nano-silica on the co-continuous morphology. A conceptual model is proposed to explain the observed effects of interfacially assembled nano-silica on the morphology which emphasizes the critical role of nano-silica content, the relaxation time of the dispersed phase and the migration time of nano-silica to the interface. The mechanical properties of the PLA/PBAT blends are clearly influenced by the observed shift in co-continuity in the presence of nano-silica. Most importantly, the mechanical properties of co-continuous PLA/PBAT are very sensitive to annealing due to morphological coarsening. Interfacially assembled nano-silica has the effect of completely stabilizing the co-continuous morphology without any diminishing of the mechanical properties. These results clearly indicate the significant potential of the interfacial assembly of nano-particles as a promising strategy toward achieving polymer blends with highly robust and stable co-continuous morphologies.
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