Authors Böhme, F. ; Komber, H. ; Jafari, S.H.
Title Synthesis and characterization of a novel unsaturated polyester based on poly(trimethylene terephthalate)
Date 30.03.2006
Number 13437
Abstract Unsaturated aromatic polyesters were obtained by glycolysis of poly(trimethylene terephthalate) with <i>cis</i>-2-buten-1,4-diol followed by a solid-state polymerization. The glycolysis was performed in a batch mode as well as through a continuous process in a twin screw extruder. The degradation and subsequent rebuilding of the polymer chain during the course of reaction was followed by means of inherent and melt viscosity measurements, and <sup>1</sup>H NMR terminal group analysis of the intermediates and the final products. Structural investigations revealed that this new approach resulted in melt processible unsaturated polyesters with cross-linkable sites having similar characteristics to that of the virgin saturated polyester. Although the processing temperature for the different reaction steps was sufficiently high (180&#x2212;260&nbsp;&#xb0;C), no thermally induced cross-linking of the incorporated unsaturated bonds could be evidenced indicating that the obtained products remained stable during the production stage. For comparison purposes, a commercial unsaturated polyester (Vestodur<sup>&#xa9;</sup>) was included in the investigati<br />ons. UV irradiation of thin polyester films did not result in cross-linked products but in <i>cis</i>&#x2013;<i>trans</i> isomerization of the incorporated bisoxybutenyl unit.
Publisher Polymer
Citation Polymer 47 (2006) 1892-1898

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