Abstract:
:Molecular orientation distributions in the crystalline and amorphous regions of a biaxially oriented poly(L-lactic acid) film were analyzed fully by polarized Raman spectroscopy. Raman bands at 926 and 875 cm(-1) were chosen for the determination of the most probable molecular orientation distribution functions for the crystalline and amorphous regions in the film. It was revealed that the PLLA molecules were oriented biaxially in both the crystalline and amorphous regions. The orientation distribution normal to the film surface was found to be broader in the amorphous regions than in the crystalline regions. Furthermore, a predominant unidirectional molecular orientation was observed in the crystalline regions, whereas the molecular orientation distribution in the amorphous regions was isotropic in the plane parallel to the film surface. The different behavior of the crystalline and amorphous regions suggests that each region underwent different deformation mechanisms during the film formation.
journal_name
Biomacromoleculesjournal_title
Biomacromoleculesauthors
Tanaka M,Young RJdoi
10.1021/bm060326lsubject
Has Abstractpub_date
2006-09-01 00:00:00pages
2575-82issue
9eissn
1525-7797issn
1526-4602journal_volume
7pub_type
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