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Accelerated Weathering-Induced Degradation of Poly(Lactic Acid) Fiber Studied by Near-Infrared (NIR) Hyperspectral Imaging.
MedLine Citation:
PMID:  22449331     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Hydrolysis degradation of a set of drawn poly(lactic acid) (PLA) fibers was induced by an accelerated weathering test, radiating ultraviolet (UV) light under a certain temperature and humidity. The fine features of the transient behavior of the PLA fibers were captured by near-infrared (NIR) hyperspectral imaging. The PLA fibers showed a gradual decrease in mechanical property (e.g., tensile strength), indicating hydrolysis degradation. Thus, the detailed analysis of the spectral variation, in turn, offers useful information on the molecular-level degradation behavior of the drawn PLA fibers. The variation of the spectral intensity as well as band position shift of the crystalline band of PLA was analyzed. The spectral intensity of the crystalline band of PLA showed gradual decrease, suggesting the decrease in molecular weight induced by the hydrolysis degradation. In addition, the crystalline band also exhibited a coinciding shift to the lower wavenumber direction with the weathering test, revealing cleavage-induced crystallization of the PLA samples. Consequently, the hydrolysis degradation induced by the weathering test substantially accelerates predominant degradation of the amorphous structure of the PLA and such variation of the molecular structure, in turn, brings less ductility to the PLA fiber.
Authors:
Hideyuki Shinzawa; Masakazu Nishida; Toshiyuki Tanaka; Wataru Kanematsu
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied spectroscopy     Volume:  66     ISSN:  1943-3530     ISO Abbreviation:  Appl Spectrosc     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-03-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372406     Medline TA:  Appl Spectrosc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  470-4     Citation Subset:  IM    
Affiliation:
Research Institute of Instrumentation Frontier, Advanced Industrial Science and Technology (AIST), Japan.
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