TY - JOUR
T1 - The thermal degradation mechanism and kinetic analysis of hydrogenated bisphenol-A polycarbonate
AU - Wu, Yuan Hsiang
AU - Wang, Cheng Chien
AU - Chen, Chuh Yung
N1 - Funding Information:
The financial support from the Ministry of Science and Technology of the Republic of China (MOST 109-3116-F-006-015-CC1 and MOST 108-2221-E-006-001-) is gratefully acknowledged. The authors also gratefully acknowledge the use of Bruker Avance 600NMR Spectrometer equipment belonging to the Instrument Center of National Cheng Kung University, and the use of TGA-GC/MS equipment belonging to the Instrument Center of National Tsing Hua University.
Funding Information:
The financial support from the Ministry of Science and Technology of the Republic of China (MOST 109-3116-F-006-015-CC1 and MOST 108-2221-E-006-001-) is gratefully acknowledged. The authors also gratefully acknowledge the use of Bruker Avance 600NMR Spectrometer equipment belonging to the Instrument Center of National Cheng Kung University, and the use of TGA-GC/MS equipment belonging to the Instrument Center of National Tsing Hua University.
Publisher Copyright:
© 2020, The Polymer Society, Taipei.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Hydrogenated bisphenol-A polycarbonate (PHBPA) was successfully synthesized from dimethyl carbonate (DMC) and hydrogenated bisphenol-A (HBPA) by the method of two-step polycondensation. The chemical structure and the molecular weight of PHBPA was identified by 1H-NMR spectra and gel permeation chromatography (GPC), respectively. In order to analyze the thermal degradation mechanism of PHBPA, a non-isothermal pyrolysis process was conducted and the violate products were detected using Fourier-transform infrared spectroscopy (FTIR) and gas chromatography–mass spectrometry (GC-MS). There were some reactions occurred during the pyrolysis including decarboxylation, disproportionation of the C–H transfer and β–H transfer, and the Fries rearrangement. In addition, the well-known Flynne–Walle–Ozawa (FWO) and Coats–Redfern kinetic analysis methods were used to calculate the values of activation energy and pre-exponential factors. Furthermore, isothermal pyrolysis experiments were performed and revealed that the reaction of decarboxylation occurred at 225 °C. This decarboxylation suggests that the molecular chain of PHBPA does not easily grow to a high-molecular-weight polymer.
AB - Hydrogenated bisphenol-A polycarbonate (PHBPA) was successfully synthesized from dimethyl carbonate (DMC) and hydrogenated bisphenol-A (HBPA) by the method of two-step polycondensation. The chemical structure and the molecular weight of PHBPA was identified by 1H-NMR spectra and gel permeation chromatography (GPC), respectively. In order to analyze the thermal degradation mechanism of PHBPA, a non-isothermal pyrolysis process was conducted and the violate products were detected using Fourier-transform infrared spectroscopy (FTIR) and gas chromatography–mass spectrometry (GC-MS). There were some reactions occurred during the pyrolysis including decarboxylation, disproportionation of the C–H transfer and β–H transfer, and the Fries rearrangement. In addition, the well-known Flynne–Walle–Ozawa (FWO) and Coats–Redfern kinetic analysis methods were used to calculate the values of activation energy and pre-exponential factors. Furthermore, isothermal pyrolysis experiments were performed and revealed that the reaction of decarboxylation occurred at 225 °C. This decarboxylation suggests that the molecular chain of PHBPA does not easily grow to a high-molecular-weight polymer.
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U2 - 10.1007/s10965-020-02204-3
DO - 10.1007/s10965-020-02204-3
M3 - Article
AN - SCOPUS:85088900578
SN - 1022-9760
VL - 27
JO - Journal of Polymer Research
JF - Journal of Polymer Research
IS - 8
M1 - 246
ER -