Depolymerization of poly(butylene terephthalate) in sub- and supercritical ethanol in a fused silica capillary reactor or autoclave reactor

Pan, Zhiyan; Shi, Yinghai; Liu, Li; Jin, Zhaoqing

doi:10.1016/j.polymdegradstab.2013.04.004

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The fused silica capillary reactor (FSCR) pioneered by Chou and Pan, 18 which has been widely used in hightemperature and/or high-pressure experiments. [19][20][21][22][23] Its transparency allows for visual observation and online analysis. This study used FSCR combined with optical microscopy and Raman spectroscopy to investigate the hydrolysis and pyrolysis processes of polylactic acid insitu at temperatures up to 285 C. By observing the morphology and spectral changes of PLA throughout the decomposition process, it provides new insights into the hydrolysis and pyrolysis kinetics of PLA.…”

Section: Introductionmentioning

confidence: 99%

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In‐situ experimental study on the hydrolysis and pyrolysis processes of polylactic acid

Zhao,

Zheng,

Chen

et al. 2024

Polymer Engineering & Sci

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In order to better understand the hydrolysis and pyrolysis process of polylactic acid (PLA), we carried out in‐situ experiments by observing the decomposition process of PLA at high temperature (up to 285°C) in both aqueous and anhydrous environments through fused silica capillary reactor (FSCR) combined with Raman spectroscopy analysis. By analyzing the strength change of characteristic peaks of PLA with increasing temperature, it was found that the initial melting temperature of PLA, in both the hydrolysis and pyrolysis processes, is around 170°C. Based on infrared spectroscopy analysis, it was found that the products of PLA pyrolysis are CO2, CH3CHCO, and CH3CHO, indicating that the pyrolysis process of PLA results from a free radical reaction. By comparing the Raman peak area ratios at different peak positions at different temperatures, it was found that the hydrolysis process of PLA mainly involves breaking the COC and CCO bonds of PLA, producing lactic acid, ethanol, CO2, and H2O. The hydrolysis reaction rate of PLA increases with the increase of temperature and exhibits a slow‐fast‐slow S‐shaped trend. The kinetic process of hydrolysis of PLA was well described using the Logistic model. The activation energy for the hydrolysis (Q) of PLA is 18.1 kcal∙mol−1 in the temperature range of 250–285°C. The results of this study provide important insights and crucial parameters for the production and application of PLA.

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Section: Introductionmentioning

confidence: 99%

“…The fused silica capillary reactor (FSCR) pioneered by Chou and Pan, 18 which has been widely used in high‐temperature and/or high‐pressure experiments 19–23 . Its transparency allows for visual observation and online analysis.…”

Section: Introductionmentioning

confidence: 99%

In‐situ experimental study on the hydrolysis and pyrolysis processes of polylactic acid

Zhao,

Zheng,

Chen

et al. 2024

Polymer Engineering & Sci

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“…Accordingly, their mass transfer rates approach those in gases, while solvation properties similar to conventional liquid solvents . The depolymerization reactions of common polymers such as polycarbonate (PC) , poly(ethylene terephthalate) (PET) , poly(trimethylene terephthalate) (PTT) , poly(butylene terephthalate) (PBT) , polyimide (PI) and polyethylene (PE) have been studied. However, few studies have focused on depolymerization of PEN , and provided quite limited information.…”

Section: Introductionmentioning

confidence: 99%

Depolymerization of poly(ethylene naphthalate) in fused silica capillary reactor and autoclave reactor from 240 to 280°C in subcritical water

Bei

Wang

et al. 2017

Polymer Engineering & Sci

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Depolymerization of poly(ethylene naphthalate) (PEN) in subcritical water was performed in a fused silica capillary reactor (FSCR) and an autoclave reactor. The phase behaviors of PEN in water during the heating-cooling process in the FSCR were observed under microscope and images were captured by digital camera. Reaction conditions for PEN hydrolysis in the autoclave reactor were chosen based on the experimental results obtained from the FSCR. Under autogenous pressures in the autoclave reactor, the effects of the water/PEN mass ratio (8.0 g/1.0 g to 16.0 g/1.0 g), reaction temperature (240-2808C) and reaction time (5-60 min) on the depolymerization yield and products yields were investigated. The main products of depolymerization were identified and quantified as 2,6naphthalene dicarboxylic acid (2,6-NDA) and ethylene glycol (EG). PEN was completely depolymerized at 2608C in 60 min with an optimal water/PEN mass ratio of 12.0 g/1.0 g (12:1). The yields of 2,6-NDA and EG were optimized to 83.1% and 79.7%, respectively. Reaction kinetics analysis showed that the PEN depolymerization in subcritical water was first-order and the activation energy was 95 kJ mol 21 . Additionally, a reaction pathway was proposed based on the experimental results. POLYM. ENG. SCI.,

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Kuchling

Kureti

2018

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Depolymerization of poly(butylene terephthalate) in sub- and supercritical ethanol in a fused silica capillary reactor or autoclave reactor

Cited by 14 publications

References 22 publications

In‐situ experimental study on the hydrolysis and pyrolysis processes of polylactic acid

In‐situ experimental study on the hydrolysis and pyrolysis processes of polylactic acid

Depolymerization of poly(ethylene naphthalate) in fused silica capillary reactor and autoclave reactor from 240 to 280°C in subcritical water

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