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首页> 外文期刊>Journal of Applied Polymer Science >Effect of MIL-53 (Al) MOF particles on the chain mobility and crystallization of poly(L-lactic acid)
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Effect of MIL-53 (Al) MOF particles on the chain mobility and crystallization of poly(L-lactic acid)

机译：MIL-53（Al）MOF颗粒对聚（L-乳酸）链迁移率和结晶的影响

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摘要

Polymer-filler interactions significantly influence morphology, functionality, and various desirable properties of mixed matrix membranes (MMMs). In this study, chain mobility and crystallization of poly(l-lactic acid) (PLLA) MMM films prepared by solvent casting PLLA with 1, 5, 10, and 20% wt/wt of MIL-53(Al) metal organic framework (MOF) were evaluated. The fabricated MMMs were characterized using differential scanning calorimetry, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Differential scanning calorimetry studies indicated that the addition of MOF particles in the PLLA matrix reduces the polymeric chain mobility, which affects the crystallization process. The percent crystallinity of neat PLLA was found to decrease from 4% in neat PLLA to completely amorphous structures in PLLA-10% and PLLA-20% MMMs, as observed in the second heating cycle. Fourier transform infrared spectroscopy data supports these observations. Thermogravimetric analysis results showed that PLLA-MOF films are thermally less stable than neat PLLA suggesting that MOF particles act as a depolymerization catalyst for PLLA. Partial agglomeration of MOF particles was observed in the samples using scanning electron microscopy studies. This study indicates strong PLLA-MIL-53(Al) MOF interactions. In addition, this study also provides insight into the effect of MOF particles on the segmental mobility and morphology of PLLA-MIL-53 (Al) composite films. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45690.
机译：聚合物填料相互作用显着影响混合基质膜（MMM）的形态，功能和各种所需性质。在该研究中，通过溶剂浇铸PLLA制备的聚（L-乳酸）（PLLA）MMM膜的链迁移率和结晶，其中1,5,10和20％wt / wt / wt / wt / wt / wt / wt / wt / ky）金属有机框架（评估MOF）。使用差示扫描量热法，傅里叶变换红外光谱，热重分析和扫描电子显微镜表征制造的MMM。差分扫描量热法研究表明，在PLLA基质中添加MOF颗粒降低了聚合物链迁移率，这会影响结晶过程。如在第二加热循环中所观察到的，发现整个PLLA的结晶度百分比从整个PLLA中的4％降低到PLLA-10％和PLLA-20％MMM中的完全无定形结构。傅里叶变换红外光谱数据支持这些观察。热重分析结果表明，PLLA-MOF薄膜的热不如整齐的PLLA稳定，表明MOF颗粒作为PLLA的解聚催化剂。使用扫描电子显微镜研究在样品中观察MOF颗粒的部分凝聚。本研究表明强大的PLLA-MIL-53（AL）MOF相互作用。此外，本研究还提供了洞察MOF颗粒对PLLA-MIL-53（Al）复合膜的节段迁移率和形态的影响。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45690。

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