Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl DicarbonatesReport as inadecuate




Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates - Download this document for free, or read online. Document in PDF available to download.

1

Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942, Jordan

2

Department of Pharmaceutical Sciences, Faculty of Pharmacy, The University of Jordan, Amman 11942, Jordan

3

Department of Chemistry, Faculty of Arts and Sciences, University of Petra, P.O. Box 961343, Amman 11196, Jordan





*

Author to whom correspondence should be addressed.



Abstract This work presents a new synthetic approach to aromatic and aliphatic polycarbonates by melt polycondensation of bisphenol A diacetates with alkylene- and arylenediphenyl dicarbonates. The diphenyl dicarbonates were prepared from phenyl chloroformate and the corresponding dihydroxy compounds. The process involved a precondensation step under a slow stream of dry argon with the elimination of phenyl acetate, followed by melt polycondensation at high temperature and under vacuum. The potential of this reaction is demonstrated by the successful synthesis of a series of aromatic-aromatic and aromatic-aliphatic polycarbonates having inherent viscosities from 0.19 to 0.43 dL-g. Thus low to intermediate molecular mass polymers were obtained. The 13C-NMR spectra of the carbon of the carbonate group showed that the formed polycarbonates contain partial random sequence distribution of monomer residues in their chains. The polycarbonates were characterized by inherent viscosity, FTIR, 1H-NMR and 13C-NMR spectroscopy. The glass transition temperatures, measured by DSC, of the polycarbonates were in the range 13–108 ºC. The thermogravimetric curves of showed that these polymers have good thermal stability up to 250 ºC. The present approach may open the door for novel polycarbonates containing other organic functional groups.

Keywords: diphenyl dicarbonate; diacetates; polycondensation; polycarbonates; synthesis; interchange reactions diphenyl dicarbonate; diacetates; polycondensation; polycarbonates; synthesis; interchange reactions





Author: Bassam A. Sweileh 1,* , Yusuf M. Al-Hiari 2, Mohammad H. Kailani 1 and Hani A. Mohammad 3

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents