Near-infrared (NIR) imaging analysis of polylactic acid (PLA) nanocomposite by multiple-perturbation two-dimensional (2D) correlation spectroscopy

被引：10

作者：

Shinzawa, Hideyuki ^{[1
]}

Murakami, Takurou N. ^{[2
]}

Nishida, Masakazu ^{[1
]}

Kanematsu, Wataru ^{[1
]}

Noda, Isao ^{[3
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Instrumentat Frontier, Nagoya, Aichi 4638560, Japan

[2] Natl Inst Adv Ind Sci & Technol, Res Inst Innovat Sustainable Chem, Tsukuba, Ibaraki 3058565, Japan

[3] Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2014年 / 1069卷

关键词：

Multiple-perturbation two-dimensional (2D) correlation spectroscopy; Near-infrared (NIR) imaging; Polylactic acid (PLA); Nanocomposite; POLY(LACTIC ACID); CRYSTALLIZATION; TEMPERATURE; CELLULOSE; PRESSURE; BEHAVIOR; SPECTRA;

D O I：

10.1016/j.molstruc.2014.03.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Multiple-perturbation two-dimensional (2D) correlation spectroscopy was applied to sets of near-infrared (NIR) imaging data of polylactic acid (PLA) nanocomposite samples undergoing UV degradation. Incorporation of clay nanoparticles substantially lowers the surface free energy barrier for the nucleation of PLA and eventually increases the frequency of the spontaneous nucleation of PLA crystals. Thus, when exposed to external stimuli such as UV light, PLA nanocomposite may show different structure alternation depending on the clay dispersion. Multiple-perturbation 2D correlation analysis of the PLA nanocomposite samples revealed different spatial variation between crystalline and amorphous structure of PLA, and the phenomenon especially becomes acute in the region where the clay particles are coagulated. The incorporation of the clay leads to the cleavage-induced crystallization of PLA when the sample is subjected to the UV light. The additional development of the ordered crystalline structure then works favorably to restrict the initial degradation of the polymer, providing the delay in the weight loss of the PLA. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：171 / 175

页数：5

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