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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
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
2012
发表期刊Macromolecules
ISSN0024-9297
卷号45期号:1页码:189-197
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.
学科领域高分子化学 ; 分析化学
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
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收录类别SCI
语种英语
WOS记录号WOS:000298905000023
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被引频次:87[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sioc.ac.cn/handle/331003/28413
专题高分子材料研究室
通讯作者Pan PJ(潘鹏举)
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GB/T 7714
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.
APA 潘鹏举.,杨进军.,单国荣.,包永忠.,翁志学.,...&井上义夫.(2012).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.Macromolecules,45(1),189-197.
MLA 潘鹏举,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".Macromolecules 45.1(2012):189-197.
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