PLA nanocomposites: Effect of filler type on non-isothermal crystallization
PLA nanocomposites: Effect of filler type on non-isothermal crystallization
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DOI：
10.1016/j.tca.2010.08.004
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发表时间：
2010-11-20
影响因子：
3.5
通讯作者：
Bikiaris, D.
中科院分区：
文献类型：
--
作者：
Papageorgiou, G. Z.;Achilias, D. S.;Bikiaris, D.
聚（L-乳酸）（PLA）与气相二氧化硅纳米粒子（SiO2）蒙脱石（MMT）和氧化多壁碳纳米管（o-MWCNT）的纳米复合材料。通过溶解蒸发法制备含有 2 5 wt% 纳米颗粒的 SEM 显微照片证明纳米颗粒精细分散到 PIA 基质中 这作为有效的增强剂，增加了储能模量，正如 DMA 分析所验证的。 发现纳米颗粒在二氧化硅纳米颗粒和 MWCNT 的情况下是有效的成核剂。 纳米粒子的存在加速了反应，使用弗里德曼等转化法计算的有效活化能降低了计算的成核活性冷结晶也受到纳米粒子的存在的影响然而，这种现象似乎在较低温度下开始，这导致形成不完美的晶体结构，最终降低了剩余无定形聚合物的大分子链迁移率 限制最终结晶度 (C) 2010 Elsevier B V 版权所有
Nanocomposites of poly(L-lactic acid) (PLA) with fumed silica nanoparticles (SiO2) montmorillonite (MMT) and oxidized multi-walled carbon nanotubes (o-MWCNTs). containing 2 5 wt% nanoparticles were prepared by solved evaporation method SEM micrographs evidenced fine dispersion of the nanoparticles into PIA matrix This has as result to act as efficient reinforcing agents increasing the storage modulus as was verified from DMA analysis The nanoparticles were found to be effective nucleaging agents in cases of silica nanoparticles and MWCNT On cooling from the melt crystallization was accelerated by the presence of nanoparticles and the effective activation energy calculated using the isoconversional method of Friedmann decreased The nucleation activity was calculated Cold-crystallization was also affected by the presence of nanoparticles However it seems that the phenomenon begins at lower temperatures and this results in formation of imperfect crystalline structure which reduce macromolecular chain mobility of the remaining amorphous polymer finally limiting the ultimate crystallinity (C) 2010 Elsevier B V All rights reserved