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Pyrolysis Kinetics of Poly(L-lactide) with Carboxyl and Calcium Salt End Structures

Authors :
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan
Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan
National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
Fan, Yujiang
Nishida, Haruo
Hoshihara, Shinya
Shirai, Yoshihito
Tokiwa, Yutaka
Endo, Takeshi
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan
Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan
National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
Fan, Yujiang
Nishida, Haruo
Hoshihara, Shinya
Shirai, Yoshihito
Tokiwa, Yutaka
Endo, Takeshi
Publication Year :
2018

Abstract

type:Journal Article<br />To clarify the pyrolysis mechanism of poly(L-lactide), which has been reported as complex, the thermal decomposition of carboxyl type and calcium ion end capped PLLA (PLLA-H and PLLA-Ca, respectively) was investigated by means of thermogravimetric analysis (TG), and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The TG data revealed that PLLA-Ca has a lower pyrolysis temperature (220~360°C) than that of carboxyl type PLLA-H (280~370°C). The apparent activation energy of the decomposition reaction was estimated from TG curves at different heating rates by plural methods to be 176 and 98 kJ mol-1 for PLLA-H and PLLA-Ca, respectively. Further kinetic studies indicated that PLLA-H degraded mainly through a random reaction with a pre-exponential factor A=2.0×1012 s-1, whereas PLLA-Ca degraded by way of a 1st-order reaction with A=8.4×105 s-1. Pyrolysis products of PLLA-H were composed of lactides and other cyclic oligomers, while the degradation products of PLLA-Ca were principally lactides. The main reaction pathway for PLLA-H pyrolysis was regarded as the random transesterification, whereas for PLLA-Ca pyrolysis the unzipping depolymerization process was dominant.

Details

Database :
OAIster
Notes :
Japanese
Publication Type :
Electronic Resource
Accession number :
edsoai.on1389679298
Document Type :
Electronic Resource

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