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学科主题: 高分子化学 ; 分析化学
题名: Temperature-Variable FTIR and Solid-State C-13 NMR Investigations on Crystalline Structure and Molecular Dynamics of Polymorphic Poly(L-lactide) and Poly(L-lactide)/Poly(D-lactide) Stereocomplex
其他题名: 变温傅里叶红外和固相13C核磁共振法研究多晶型L-聚乳酸和L-聚乳酸/D-聚乳酸立体复合物的晶体结构和分子动力学
作者: Pan PJ(潘鹏举) ; Yang JJ(杨进军) ; Dan GR(单国荣) ; Bao YZ(包永忠) ; Weng ZX(翁志学) ; Cao AM(曹阿民) ; 矢泽宏次 ; 井上义夫
通讯作者: 潘鹏举
刊名: Macromolecules
发表日期: 2012
卷: 45, 期:1, 页:189-197
收录类别: SCI
部门归属: 浙江大学; 东京工业大学; 天津理工大学; 中科院上海有机化学研究所
英文摘要: Crystalline structure and molecular dynamics in alpha and alpha' crystals of poly(L-lactide) (PLLA) and PLLA/poly(Dlactide) (PDLA) stereocomplex (sc) crystals have been investigated by the temperature-variable FTIR and solid-state C-13 CP-MAS NMR spectroscopy. The crystal forms of polylactide (PLA) have different band frequencies, correlation field splittings in FTIR spectra and different line shapes, and resonance splittings in solid-state NMR spectra, which become more distinct with cooling to the cryogenic conditions. The well-resolved splittings in NMR resonances of alpha crystals, attributable to the crystallographically inequivalent sites within crystal unit cell, are considered to be due to the dipolar interactions related to the carbonyl, methyl, and methine groups. The splittings in FTIR bands and NMR resonances are absent in alpha' crystals, indicating the disordered conformation and loose molecular lateral packing within their crystal lattices. The significant FTIR frequency shifts of nu(C=O), nu(CH3), and nu(CH) modes during stereocomplex crystallization of PLLA/PDLA blend and the appearance of spectral splittings at cryogenic conditions suggest the coexistence of weak C-H center dot center dot O=C hydrogen bonds and dipolar interactions between PLLA and PDLA chains in the sc crystals of PLA Below the glass transition temperature (T-g), the spin lattice relaxation times of PLA with different crystalline structures increase in the order of amorphous approximate to alpha' < alpha < sc.
语种: 英语
相关网址: 查看原文
WOS记录号: WOS:000298905000023
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内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/28413
Appears in Collections:高分子材料研究室_期刊论文

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Recommended Citation:
Pan PJ,Yang JJ,Dan GR,et al. Temperature-Variable FTIR and Solid-State C-13 NMR Investigations on Crystalline Structure and Molecular Dynamics of Polymorphic Poly(L-lactide) and Poly(L-lactide)/Poly(D-lactide) Stereocomplex[J]. Macromolecules,2012,45(1):189-197.
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