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《Synthetic Fiber Industry》 1990-06
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DYNAMICS OF COLD SOLID-PHASE POLYCONDENSATION OF PET

Chen Kechuan (Vinylon Plant of Shanghai Petrochemical works)  
Using fiber-grade PET chips with〔η〕0.655 and softening temperature 262.7℃ asmat-erials,in a drying oven under the reaction temperature 115-190℃ and reaction time 0-11 hours respectively,the variation of inherent viscosity is studied.The reactions weremainly involved in chain-extending and hydrolytic degradation.In this work,the appar-ent velocity constant and activation energy of chain-extending reaction were obtainedquantitatively.The resultss how:①when the temperature is less than or equal to 130℃,the molecular weight increases linearly after it decreases to the minimum as the increaseof reaction time.②when the temperature is more than 130℃,the molecular weight incr-eases linearly.It means that the main reaction in the system is hydrolytic degradation ofester bondand that when temperature over 130℃,the chain-extending is the main reac-tion.The solid-phase polycondensation of PET chips under low temperature is a two-orderreaction same as that occurs under high temperature.The diffusion of macromo-lecular chains has a great influence on the velocity of chain-extending,but there isalittle influence with temperature on the velocity.
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【References】
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1 ZHOU Xiang-jin(Chemical Department,China Petroleum & Chemical Corporation,Beijing 100728,China);Study on Polyester Fiber Solid State Polycondensation and Fiber Stretch[J];Synthetic Fiber in China;2008-11
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Chinese Journal Full-text Database 10 Hits
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