Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites
Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites
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亚磷酸酯扩链反应制备高分子量聚L-乳酸及其表征
DOI：
10.1002/app.33750
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发表时间：
2012
影响因子：
3
通讯作者：
Rongjie Yang
中科院分区：
文献类型：
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作者：
Jianwu Xie;Rongjie Yang
通过微配混机中的扩链反应制备高分子量的聚(L-乳酸)(PLLA)。使用亚磷酸酯作为扩链剂来增加 PLLA 预聚物的分子量，该预聚物是通过 L-乳酸本体缩聚制备的。研究了亚磷酸酯用量、温度和螺杆转速对PLLA熔体扭矩的影响。在最佳条件下，PLLA的分子量从62,100 g/mol增加到126,000 g/mol。通过傅里叶变换红外光谱、1H-NMR和13C-NMR、差示扫描量热法和X射线衍射对PLLA的化学结构和结晶度进行了表征。测量了 PLLA 的机械性能。结果表明，亚磷酸三苯酯 (TPPi) 是 PLLA 的有效扩链剂。 TPPi 在扩链中的作用被认为是酯化促进剂。 © 2011 Wiley periodicals, Inc. J Polym Sci A 部分：Polym Chem，2012
Poly(l-lactic acid) (PLLA) of high molecular weight was prepared by a chain-extending reaction in a microcompounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer, which was prepared by the bulk polycondensation of l-lactic acid. The effects of the amount of phosphite, the temperature, and the screw speed on the torque of the PLLA melt were studied. Under the optimal conditions, the molecular weight of PLLA increased from 62,100 to 126,000 g/mol. The chemical structure and crystallinity of PLLA were characterized by Fourier transform infrared spectroscopy, 1H-NMR and 13C-NMR, differential scanning calorimetry, and X-ray diffraction. The mechanical properties of PLLA were measured. The results indicate that triphenyl phosphite (TPPi) was an effective chain extender for PLLA. The role of the TPPi in chain extending is suggested to be an esterification-promotion agent. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
M. Kimura：“手性扭曲卟啉二聚体的自组装”新。
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