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The Solid State Postcondensation of PET, 3

✍ Scribed by Barbara Gantillon; Roger Spitz; Timothy F. McKenna

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
194 KB
Volume
289
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Summary: It was demonstrated that it is possible to produce prepolymers with a number‐average degree of polymerisation on the order of 5–40 directly in a liquid‐liquid dispersion in less than three hours. It was also shown that prepolymers made via this route and rapidly crystallised by the addition of a dispersant at ambient temperature are more porous than prepolymers made in an industrial liquid melt process.

SEM micrograph of prepolymers pLL‐PTA with \overline {DP} _{\rm n} = 28, d~p~β€‰βˆˆβ€‰63–125 ΞΌm.

magnified imageSEM micrograph of prepolymers pLL‐PTA with \overline {DP} _{\rm n} = 28, d~p~β€‰βˆˆβ€‰63–125 ΞΌm.

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The Solid State Postcondensation of PET,
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## Abstract **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

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## Abstract **Summary:** A process for the solid state polycondensation of PET is proposed. It is shown that by correctly choosing the prepolymerisation conditions it is possible to crystallise the product and to directly polymerise it in a dispersed phase. This process is significantly faster than

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## Abstract **Summary:** A new method of polymerising PET in the solid state is proposed in either a gas phase reactor, or in hydrocarbon dispersion. It is shown that the reaction can be carried out efficiently at temperatures on the order of 200–240 °C directly from a prepolymer without the need f