Kinetics and thermodynamics of hydrolytic depolymerization of poly(ethylene terephthalate) at high pressure and temperature

2003 ◽  
Vol 90 (12) ◽  
pp. 3305-3309 ◽  
Author(s):  
S. Mishra ◽  
V. S. Zope ◽  
A. S. Goje
Keyword(s):  
High Pressure ◽  
Ethylene Terephthalate ◽  
High Pressure And Temperature ◽  
Kinetics And Thermodynamics ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Hydrolytic Depolymerization

Fracture and Deformation of Extended-Chain Crystals in Poly(ethylene Terephthalate)/Bisphenol-A Polycarbonate Blends Crystallized at High Pressure

2011 ◽  
Vol 214 ◽  
pp. 301-305
Author(s):  
Jun Lu ◽  
Jiao Jiao Tian ◽  
Dao Peng Zhang ◽  
Rui Huang
Keyword(s):  
High Pressure ◽  
Bisphenol A ◽  
Single Crystals ◽  
Ethylene Terephthalate ◽  
Morphological Observation ◽  
Bisphenol A Polycarbonate ◽  
Extended Chain ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Functional Components

With a combination of three-dimensional crystal ordering and long-chain molecular orientational ordering, the extended-chain crystals of polymers are ideal system for the studies on low-dimensional physics, and have potential applications as functional components. In this study, poly (ethylene terephthalate) / bisphenol-A polycarbonate (PET/BAPC) blend samples were prepared with solid phase forming technique under high pressure, and extended-chain single crystals with large c-axis thickness were formed within a relative short time. The fracture and deformation behaviors of the grownup crystals were investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Morphological observation showed that most of the extended-chain crystals were endowed with perfect appearance after the sample fracture. However, there were still a few crystals fractured apart, along or perpendicularly to their c-axis direction, or with cohesive fracture surfaces. Fractured spherulites with extended-chain lamellae as substructures were also disclosed in extended-chain crystals with AFM. Furthermore, the parallel lamellae deformed and changed their striation direction during the crystal growth, as was observed on a kind of extended-chain crystals grown in a PET oligomer and BAPC blend (PETO/BAPC). This study may be instructive to the improvement of the separation technique of such single crystals, so as to hasten their real applications.

scholarly journals Microhardness and structure of high pressure crystallized poly(ethylene terephthalate)

Polymer ◽  
1994 ◽  
Vol 35 (22) ◽  
pp. 4775-4779 ◽  
Author(s):  
F.J. Baltá^Calleja ◽  
O. Öhm ◽  
R.K. Bayer
Keyword(s):  
High Pressure ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Hydrolytic depolymerization of poly(ethylene terephthalate) under microwave irradiation

2004 ◽  
Vol 95 (3) ◽  
pp. 719-723 ◽  
Author(s):  
Lixin Liu ◽  
Dong Zhang ◽  
Lijia An ◽  
Huayang Zhang ◽  
Yiguang Tian
Keyword(s):  
Microwave Irradiation ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Hydrolytic Depolymerization

Energy Efficiency Analysis of PET Hydrolyzed by Different Ways of Microwave Irradiation

2014 ◽  
Vol 1078 ◽  
pp. 114-117
Author(s):  
Mi Mi Wang ◽  
Na Liu ◽  
Zhi De Liu ◽  
Dong Zhang
Keyword(s):  
Energy Efficiency ◽  
Microwave Irradiation ◽  
Ethylene Terephthalate ◽  
Energy Utilization ◽  
Poly Ethylene Terephthalate ◽  
Continuous Radiation ◽  
Poly Ethylene ◽  
Radiation Time ◽  
Hydrolytic Depolymerization ◽  
Total Reaction Time

The effect of microwave irradiation way on hydrolytic depolymerization of poly (ethylene terephthalate) (PET) was studied at 175°C, 180°C and 185°C. Based on this study, an additional experiment that the intermittent radiation time was one tenth of total reaction time (intermittent radiation (1/10)) was conducted to research the microwave energy utilization. The results showed that the energy efficiency increased as the temperature rose. And the energy utilization of intermittent radiation (1/10) was 16.7% higher than that of the continuous radiation at 175°C.

Sign in / Sign up

Export Citation Format

Share Document