fulltext.study @t Gmail

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

Paper ID Volume ID Publish Year Pages File Format Full-Text
26862 43982 2014 7 PDF Available
Title
Ageing of PCCD aliphatic polyesters: Effect of stereochemistry and ionic chain terminals
Abstract

•The durability of PCCD films has been analyzed as function of stereochemistry.•Rheology identifies two degradation mechanisms: chain scission and recombination.•The addition of ionic end groups induces only chain recombination.

A series of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD) samples, characterized by different cis/trans ratio of the 1,4-cyclohexanedicarbonyl units, and a PCCD ionomer, containing 3 mol% of ionic terminal groups, were exposed to accelerated UV in order to study the molecular modifications occurring during the ageing period and correlate them to the initial macromolecular structure. A relationship between stereochemistry and sensitivity towards oxidative degradation was found: with the increment of the trans content in 1,4-cyclohexylene units of the samples, the materials proved more resistant to oxidation processes. Moreover, some degradation mechanisms were determined: chain combination process prevails at short exposure times while chain scissions are predominant at long ageing times. It is worth noting that the presence of terminal ionic groups causes a sizable modification of the degradation processes: only chain recombinations take place. This study aims at improving knowledge necessary to design novel (co)polyesters characterized by well adapted physical, thermal and mechanical properties, and also, with well adapted durability to their application.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Aliphatic polyester; Cis–trans ratio; Ionic end-groups; Photooxidation; Molecular evolution
First Page Preview
Ageing of PCCD aliphatic polyesters: Effect of stereochemistry and ionic chain terminals
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 292, 15 October 2014, Pages 42–48
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us