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首页> 外文期刊>Journal of Applied Polymer Science >Chemomechanical, morphological, and rheological studies of chitosan-graft-lactic acid oligomer reinforced poly(lactic acid) bionanocomposite films
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Chemomechanical, morphological, and rheological studies of chitosan-graft-lactic acid oligomer reinforced poly(lactic acid) bionanocomposite films

机译：壳聚糖 - 移植物 - 乳酸低聚物增强聚（乳酸）胆汁复合薄膜的化学力学，形态学和流变研究

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摘要

Various compositions of nontoxic biodegradable poly(lactic acid) (PLA)/chitosan-graft-lactic acid oligomer (CH-g-OLLA) bionanocomposite films were fabricated with a solution casting technique by the dispersal of CH-g-OLLA copolymer at different amounts (1, 3, and 5 wt %) into the PLA matrix. The filler (CH-g-OLLA) was synthesized by an in situ condensation polymerization reaction in a microwave, and the grafting of lactic acid oligomer chains at the C2 position of the chitosan backbone was confirmed by the presence of new peaks at 179.08 and 174.41ppm in C-13-NMR analysis. The transparency results show the synergic effect of CH-g-OLLA in the form of reduced transparency and excellent blocking capability of UV light. Dynamic mechanical analysis confirmed a reduction in the glass-transition temperature (up to approximate to 13 degrees C) with increasing filler concentration; this signified the improvement in the elongation of bionanocomposite films. The rheological studies showed the viscous behavior of the PLA and PLA-CH-g-OLLA bionanocomposite films as the storage modulus values were found to be lower than the loss modulus values over the entire range of angular frequency at 180 degrees C. Furthermore, a Cole-Cole plot and Han plot described the uniform dispersion of the filler in the PLA matrix, its agglomeration at higher loading, and the structural change between the PLA and PLA-CH-g-OLLA bionanocomposite films. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45546.
机译：通过不同量的CH-G-OLLA共聚物的分散用溶液浇铸技术制备各种组合物的无毒可生物降解的聚（乳酸）（PLA）/壳聚糖 - 移植物 - 乳酸低聚物（CH-G-G-OLLA）脱硫聚合物薄膜（1,3和5wt％）进入PLA矩阵。通过在微波中的原位缩聚聚合反应合成填料（CH-G-OLLA），通过在179.08和174.41的新峰的存在，确认壳聚糖骨架的C2位置处的乳酸低聚物链的接枝PPM在C-13-NMR分析中。透明度结果表明了CH-G-olla以降低的透明度和优异的UV光封闭能力的形式协同作用。动态力学分析证实了玻璃化转变温度的降低（高达约13摄氏度），增加填料浓度;这意味着脱硫复合薄膜伸长的改善。流变研究表明，PLA和PLA-CH-G-OLLA脱硫膜的粘性行为，因为发现储存模量值低于在180摄氏度的整个角度频率范围内的损耗模量值低。此外，a COLE-COLE图和HAN图描述了填充剂在PLA基质中的均匀分散，其在较高负载下的附聚，以及PLA和PLA-CH-G-OLLA脱硫膜之间的结构变化。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45546。

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