Thermal degradation and melt viscosity of ultra-high-molecular-weight poly(ethylene terephthalate)

Tate, Susumu; Narusawa, Haruhiko

doi:10.1016/0032-3861(96)83706-2

Cited by 32 publications

(24 citation statements)

References 11 publications

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“…Villain et al 16 have reported activation energies of 159 kJ/mol (38 kcal/mol) for thermal degradation and 81 kJ/mol (20 kcal/mol) for thermal-oxidative degradation of PET. Tate and Narusawa 17 have determined the activation energy for thermal degradation of PET to be 172 kJ/mol (41 kcal/mol). Halek 18 has reported an activation energy of 159 kJ/mol (38 kcal/mol) for the thermal degradation of PET.…”

Section: Discussionmentioning

confidence: 99%

Processing characteristics of PET/PEN blends, part 2: Rheology and degradation kinetics

Tharmapuram

Jabarin

2003

Adv Polym Technol

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Blends and copolyesters of poly(ethylene terephthalate)/ poly(ethylene 2,6-naphthalene dicarboxylate), PET/PEN, have shown promise in high performance container applications. In the first part of this series on the processing characteristics of PET/PEN blends, we investigated the applicability of reaction kinetics to predict the critical transesterification temperature during processing and the influence of the equilibrium melting point of the miscible blends on the critical transesterification temperature. In the present work, we have studied both the rheology and degradation kinetics of the blends as a function of material composition. Melt viscosity loss was measured as a function of time and temperature. Activation energies for degradation were calculated from experimental data. Results show that blends containing a minimum of 10% PEN by weight are as stable as PEN in terms of thermal and thermal-oxidative degradation. Addition of low amounts of PEN to PET causes a depression in melt viscosity. A critical composition of 10% PEN by weight is required before an

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Section: Discussionmentioning

confidence: 99%

Processing characteristics of PET/PEN blends, part 2: Rheology and degradation kinetics

Tharmapuram

Jabarin

2003

Adv Polym Technol

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“…It appears that the size and shape of the granulated powder is important in determining the performance of the reactor, and of the final molecular weight that can be obtained. For instance a pair of patents claim that low molecular weight prepolymers can be used to obtain high products at high reaction rates if the solid particles are initially porous 31,35. The influence of these different points will be elaborated upon below.…”

Section: The Polycondensation Reactionmentioning

confidence: 99%

“…Another means of obtaining high molecular weight polyesters is to polycondense fibres or granulated powders in a solvent, or mixture of solvents that can swell the polymer 30,33–38. The rate of polycondensation remains high since the presence of a swelling agent in the polymer matrix facilitates the diffusion of small molecules like EG, and thus improves the rate of mass transfer from the polymer phase.…”

Section: The Polycondensation Reactionmentioning

confidence: 99%

“…It should be clear from the above discussion that, regardless of which process we choose for SSP, some of the more important issues that need to be addressed from a reaction engineering point of view will include: the influence of the continuous medium and temperature on the rate of polycondensation, the role played by an eventual catalyst, the solidification (and thus crystallisation) of the polymer melt, its dispersion in a continuous gas or liquid phase,30,33–39 the removal of EG and reaction by‐products and influence of reaction conditions, solid phase morphology,31,36,37 influence of particle morphology on kinetics and mass transfer, the choice of inert gas to use in the reactor, and optimising the rate of reaction via correct choice of starting conditions 3,32,40–42…”

Section: The Production Of Pet In the Solid Phase A Look At The Currmentioning

confidence: 99%

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The Solid State Postcondensation of PET, 1

Gantillon¹,

Spitz²,

McKenna³

2004

Macro Materials & Eng

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Summary: A review of the processes underlying the solid state postcondensation of poly(ethylene terephthalate) (PET) is presented. Fundamental aspects of the reactions are treated, and it is shown that the rate of polycondensation in the solid state depends on the relative rates of two types of diffusion. On the one hand, the diffusion of reaction by‐products (physical diffusion) controls the rate of the forward reactions. And on the other hand the diffusion of end‐groups (chemical diffusion) allows the reaction to proceed.The transesterification of BHET to form PET.magnified imageThe transesterification of BHET to form PET.

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“…For most polymers beyond their critical molecular weight (M c ), a value of the constant a may be taken as 3.4, however, a higher value $4.2 was reported for ultra-high molecular weight polymers [15].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Some Post-Consumer Thermoplastic Food Packaging Reclaimed from Remote Desert Areas in Saudi Arabia

Alsewailem

2008

International Journal of Polymeric Materials

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Discarded plastic food packaging articles taken from the Thomamah desert area near Riyadh in Saudi Arabia were characterized rheologically and thermally. These articles are made of polystyrene (PS), high-density polyethylene (HDPE), and polyethyleneterephthalate (PET). The aim was to assess the degradation of these plastic articles caused by prolonged exposure to a harsh desert environment such as sunlight radiation. The reduction in molecular weight of the degraded plastics relative to that of the virgin plastics was estimated from the zero-shear viscosity-molecular weight relationship g 0 ¼ k (M w ) a . The degradation was more pronounced with PS (THO6C) and PET2 (THO1BS) where the reduction in their molecular weight was estimated to be $23%. There was a lack of sharp transition from glassy to rubbery state at the T g of the degraded PS (THO6C) in comparison with the behavior of virgin PS. In addition, the degree of crystallinity of degraded PET1 (THO1BW) and degraded HDPE (THO2BW) was less than that of the virgin PET1 and virgin HDPE.

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Thermal degradation and melt viscosity of ultra-high-molecular-weight poly(ethylene terephthalate)

Cited by 32 publications

References 11 publications

Processing characteristics of PET/PEN blends, part 2: Rheology and degradation kinetics

Processing characteristics of PET/PEN blends, part 2: Rheology and degradation kinetics

The Solid State Postcondensation of PET, 1

Characterization of Some Post-Consumer Thermoplastic Food Packaging Reclaimed from Remote Desert Areas in Saudi Arabia

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