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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Shinzawa, Hideyuki Nishida, Masakazu Tanaka, Toshiyuki Kanematsu, Wataru |
| Description | Country affiliation: Japan Author Affiliation: Shinzawa H ( Research Institute of Instrumentation Frontier, Advanced Industrial Science and Technology (AIST), Japan. h-shinzawa@aist.go.jp) |
| Abstract | 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. |
| File Format | HTM / HTML |
| ISSN | 00037028 |
| Issue Number | 4 |
| Volume Number | 66 |
| e-ISSN | 19433530 |
| Journal | Applied Spectroscopy |
| Language | English |
| Publisher | Sage Publication |
| Publisher Date | 2012-04-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Imaging Discipline Analytical Chemistry Discipline Radiology Lactic Acid Chemistry Polymers Spectroscopy, Near-infrared Methods Humidity Hydrolysis Polyesters Temperature Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Instrumentation |
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