Polycarbonate synthesis by the melt phase carbonate-ester interchange reaction of bisphenol-a diacetate with dimethyl carbonate

Deshpande, M. M. ; Jadhav, A. S. ; Gunari, A. A. ; Sehra, J. C. ; Sivaram, S. (1995) Polycarbonate synthesis by the melt phase carbonate-ester interchange reaction of bisphenol-a diacetate with dimethyl carbonate Journal of Polymer Science Part A: Polymer Chemistry, 33 (4). pp. 701-705. ISSN 0887-624X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pola.19...

Related URL: http://dx.doi.org/10.1002/pola.1995.080330411

Abstract

The molecular weight of polycarbonate formed by the carbonate-ester interchange reaction of bisphenol-A diacetate (BPAC2) and dimethyl carbonate (DMC) was found to depend on the composition of the oligomer formed in its first stage. At a [DMC] : [BPAC2] ratio of 2, an oligomer with relatively higher acetate end group concentration was formed. This upon further polycondensation yielded a polycarbonate of inherent viscosity, 0.2-0.25 dL/g. Upon addition of DMC at a later stage in the oligomer-forming reaction, an oligomer containing relatively higher carbonate end groups could be obtained. These oligomers gave polycarbonates higher inherent viscosity, 0.4-0.5 dL/g. It is therefore proposed that oligomers having carbonate end groups are more reactive in self-polycondensation than those containing acetate end groups.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Polycarbonate; Polycondensation; Oligomer; Molecular Weight
ID Code:48504
Deposited On:14 Jul 2011 10:15
Last Modified:14 Jul 2011 10:15

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