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《SYNTHETIC TECHNOLOGY AND APPLICATION》 2000-02
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Solid-state Polycondensation of Poly(butylene terephthalate)

DENG De chun,YAN Zhi yong (Dong Hua University, Shanghai200051,China)  
When polybutylene terephthalate (PBT) is used as engineering plastic materials, the molecular weight plays an important role in order to reach the desired properties or have suitably high melt viscosity Solid state polycondensation (SSP) processes, for preparing particular high molecular weight PBT, are carried out by heating the low molecular weight prepolymers in the form of chips in a stream or inert gas or under vacuum at a temperature above the polymer glass transition but below the melting point. The SSP rate may depend on chemical or physical processes or both, being determined by the slow process. The main factors that affect SSP include reaction temperature and time, particle size, initial molecular weight, number and type of chain end groups, catalyst employed, crystallinity, and the technique used to remove byproducts.
【CateGory Index】: TQ322.3
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