A series of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD) samples, charac-terized by different cis/trans ratio of the 1,4-cyclohexanedicarbonyl units, and a PCCD ionomer, containing3 mol% of ionic terminal groups, were exposed to accelerated UV in order to study the molecular modi-fications occurring during the ageing period and correlate them to the initial macromolecular structure.A relationship between stereochemistry and sensitivity towards oxidative degradation was found: withthe increment of the trans content in 1,4-cyclohexylene units of the samples, the materials proved moreresistant to oxidation processes. Moreover, some degradation mechanisms were determined: chain com-bination process prevails at short exposure times while chain scissions are predominant at long ageingtimes. It is worth noting that the presence of terminal ionic groups causes a sizable modification of thedegradation processes: only chain recombinations take place. This study aims at improving knowledgenecessary to design novel (co)polyesters characterized by well adapted physical, thermal and mechanicalproperties, and also, with well adapted durability to their application.

Ageing of PCCD aliphatic polyesters: Effect of stereochemistry and ionic chain terminals

TOTARO, GRAZIA;MARCHESE, PAOLA;BANELLA, MARIA BARBARA;SISTI, LAURA;CELLI, ANNAMARIA;
2014

Abstract

A series of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD) samples, charac-terized by different cis/trans ratio of the 1,4-cyclohexanedicarbonyl units, and a PCCD ionomer, containing3 mol% of ionic terminal groups, were exposed to accelerated UV in order to study the molecular modi-fications occurring during the ageing period and correlate them to the initial macromolecular structure.A relationship between stereochemistry and sensitivity towards oxidative degradation was found: withthe increment of the trans content in 1,4-cyclohexylene units of the samples, the materials proved moreresistant to oxidation processes. Moreover, some degradation mechanisms were determined: chain com-bination process prevails at short exposure times while chain scissions are predominant at long ageingtimes. It is worth noting that the presence of terminal ionic groups causes a sizable modification of thedegradation processes: only chain recombinations take place. This study aims at improving knowledgenecessary to design novel (co)polyesters characterized by well adapted physical, thermal and mechanicalproperties, and also, with well adapted durability to their application.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. A, CHEMISTRY
Grazia Totaro; Paola Marchese; Maria Barbara Banella; Laura Sisti; Annamaria Celli; Vincent Verney; Sophie Commereuc
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/473802
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