ICCAS OpenIR
Spectroscopic and thermal analyses of alpha ' and alpha crystalline forms of poly(L-lactic acid)
Kalish, Jeffrey P.1; Aou, Kaoru1; Yang, Xiaozhen1,2; Hsu, Shaw Ling1
2011-02-03
Source PublicationPOLYMER
ISSN0032-3861
Volume52Issue:3Pages:814-821
AbstractPoly(lactic acid) samples rich in alpha' or alpha crystals have been characterized using spectroscopic and thermal methods. Cryogenic infrared and Raman spectroscopy were used to probe the differences in chain conformation and packing. Compared to the alpha crystal, the alpha' crystal has weakened specific carbonyl and methyl interactions. Experimental spectroscopic analysis in conjunction with simulation studies have shown that the alpha' crystal has uniform conformational disorder in the C-alpha-C torsion angle. This disorder in chain conformation and packing leads to different crystalline forms with different stabilities. The difference in thermal stability was quantified by measuring enthalpic change at melting for both crystalline forms. Significantly different values for the two crystalline forms were obtained (Delta H degrees(m)(alpha') = 57 +/- 3 J g(-1) and Delta H degrees(m)(alpha) = 96 3J g(-1)). The transformation from the less stable a' to the more stable a phase has been characterized. This analysis provides an explanation to the double melting peaks usually found in PLLA samples. (C) 2010 Elsevier Ltd. All rights reserved.
KeywordPoly(L-lactic Acid) Polymorphic Phase Crystallization
DOI10.1016/j.polymer.2010.12.042
Indexed BySCI
Language英语
WOS IDWOS:000287013600029
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73074
Collection中国科学院化学研究所
Corresponding AuthorHsu, Shaw Ling
Affiliation1.Univ Massachusetts, Dept Polymer Sci & Engn, Mat Res Sci & Engn Ctr, Amherst, MA 01003 USA
2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Kalish, Jeffrey P.,Aou, Kaoru,Yang, Xiaozhen,et al. Spectroscopic and thermal analyses of alpha ' and alpha crystalline forms of poly(L-lactic acid)[J]. POLYMER,2011,52(3):814-821.
APA Kalish, Jeffrey P.,Aou, Kaoru,Yang, Xiaozhen,&Hsu, Shaw Ling.(2011).Spectroscopic and thermal analyses of alpha ' and alpha crystalline forms of poly(L-lactic acid).POLYMER,52(3),814-821.
MLA Kalish, Jeffrey P.,et al."Spectroscopic and thermal analyses of alpha ' and alpha crystalline forms of poly(L-lactic acid)".POLYMER 52.3(2011):814-821.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Kalish, Jeffrey P.]'s Articles
[Aou, Kaoru]'s Articles
[Yang, Xiaozhen]'s Articles
Baidu academic
Similar articles in Baidu academic
[Kalish, Jeffrey P.]'s Articles
[Aou, Kaoru]'s Articles
[Yang, Xiaozhen]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Kalish, Jeffrey P.]'s Articles
[Aou, Kaoru]'s Articles
[Yang, Xiaozhen]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.