Determination of polybutylene terephthalate polycondensation equilibrium constant using a batch reactor

Darda, Pranay Jairam and Hogendoorn, Kees and Molenkamp, Tjaard and Versteeg, Geert (2004) Determination of polybutylene terephthalate polycondensation equilibrium constant using a batch reactor. Macromolecular Symposia, 206 (1). pp. 275-290. ISSN 1022-1360

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Abstract:	The PBT polycondensation equilibrium constant at 255°C was determined using a batch reactor. Starting from a Polybutylene terephthalate (PBT) prepolymer having a degree of polymerisation of 12.7, equilibrium experiments were performed in the range of 1 to 50 mbar. The equilibrium degree of polymerisation (i) was determined indirectly using dilute solution viscometry of a solution of 1 weight % PBT in m - cresol. The degree of polymerisation of PBT obtained at equilibrium in the range of 1 to 50 mbar at 255°C as a function of the BDO partial pressure (mbar) could be expressed by: i = 111.47 - 86.18 exp(-1.14[..]). The equilibrium solubility of 1,4 butanediol (BDO) in the PBT melt was derived form the BDO partial pressure using the Flory - Huggins theory. The PBT polycondensation reaction equilibrium constant was related to the degree of polymerisation by the equation: [..] in the range i = 26 - 100. The PBT polycondensation equilibrium constant at high degrees of polymerisation is in line with literature data and thermodynamics.
Item Type:	Article
Copyright:	© 2004 Wiley InterScience
Faculty:	Science and Technology (TNW)
Research Group:	Thermo-Chemical Conversion of Biomass (TCCB)
Link to this item:	http://purl.utwente.nl/publications/72008
Official URL:	http://dx.doi.org/10.1002/masy.200450222
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