Data/hora: 03/06/2024 09:20:15

Provedor de dados: 	5	
País: 	France	
Título: 	Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure	
Autores: 	Le Gac, Pierre-yves; Le Saux, V.; Paris, M; Marco, Y.	
Data: 	2012-03	
Ano: 	2012	
Palavras-chave: 	Chloroprene rubber; Degradation; Sea water; Silica; Accelerated ageing; Natural ageing.	
Resumo: 	Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term behaviour in such an aggressive environment is still not well known. To assess the polymer durability within reasonable durations, it is essential to perform accelerated ageing tests to accelerate the degradation kinetics but without any modification of the degradation process. This study therefore proposes and validates accelerated ageing tests to study marine ageing of a silica-filled chloroprene rubber (CR) used for offshore applications. Several accelerated ageing protocols are investigated for temperatures ranging from 20 to 80 degrees C in renewed natural seawater. The ageing consequences are characterized using physical measurements (FTIR, solid state NMR) and mechanical testing based on monotonic tension tests. Instrumented micro-indentation tests are also employed, in order to describe accurately the ageing gradients through sample thickness. The measurements obtained on the samples cut from accelerated specimens are compared to those obtained from the topcoat of an offshore flowline aged under service conditions for 23 years. For both kinds of specimens, polychloroprene develops rapid material changes most clearly represented by a considerable increase in stiffness, which allows the accelerated ageing protocols to be validated. (C) 2011 Elsevier Ltd. All rights reserved.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00073/18429/20232.pdf

DOI:10.1016/j.polymdegradstab.2011.12.015	
Editor: 	Elsevier Sci Ltd	
Relação: 	http://archimer.ifremer.fr/doc/00073/18429/	
Formato: 	application/pdf	
Fonte: 	Polymer Degradation And Stability (0141-3910) (Elsevier Sci Ltd), 2012-03 , Vol. 97 , N. 3 , P. 288-296	
Fonte: 	2011 Elsevier Ltd. All rights reserved.