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首页> 外文期刊>Journal of Applied Polymer Science >Morphology and molecular mobility of plasticized polylactic acid studied using solid-state C-13- and H-1-NMR spectroscopy
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Morphology and molecular mobility of plasticized polylactic acid studied using solid-state C-13- and H-1-NMR spectroscopy

机译：使用固态C-13-和H-1-NMR光谱研究增塑聚乳酸的形态和分子迁移率

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摘要

MAS C-13-NMR measurements were used for the study of morphology and molecular mobility in amorphous quenched and triacetine-plasticized PLA samples and PLA samples which underwent cold crystallization during annealing at 80 and 100 degrees C. The single pulse MAS C-13-NMR spectra indicate that plasticizer promotes cold crystallization which results in the decrease of the temperature of crystallization and formation of more perfect crystalline domains. The T-1(C-13) spin-lattice relaxation times show that the presence of plasticizer molecules leads to an increase of local mobility in PLA chains but plasticized PLA after annealing at 100 degrees C shows more rigid structure. The series of broad line H-1-NMR spectra performed at temperatures up to 100 degrees C provided information on the changes in relaxation processes and morphology of the studied samples. The interpretation of the results obtained using the techniques of NMR spectroscopy were supported by WAXD and DSC measurements. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43517.
机译：MAS C-13-NMR测量用于研究非晶态淬火和三乙撑增塑的PLA样品以及在80和100摄氏度退火过程中经历冷结晶的PLA样品的形态和分子迁移率。单脉冲MAS C-13- NMR光谱表明，增塑剂促进冷结晶，这导致结晶温度的降低和更完美的晶畴的形成。 T-1（C-13）自旋晶格弛豫时间表明，增塑剂分子的存在导致PLA链中的局部迁移率增加，但在100℃退火后，增塑的PLA显示出更刚性的结构。在高达100摄氏度的温度下进行的一系列宽线H-1-NMR谱图提供了有关被研究样品的弛豫过程和形态变化的信息。 WAXD和DSC测量支持使用NMR光谱技术获得的结果的解释。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43517。

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