FN Archimer Export Format
PT J
TI Role of strain induced crystallization and oxidative crosslinking in fracture properties of rubbers
BT 
AF LE GAC, Pierre-Yves
   BROUDIN, Morgane
   ROUX, Gérard
   VERDU, Jacques
   DAVIES, Peter
   FAYOLLE, Bruno
AS 1:1;2:1;3:2;4:3;5:1;6:3;
FF 1:PDG-REM-RDT-LCSM;2:PDG-REM-RDT-MS;3:;4:;5:PDG-REM-RDT-LCSM;6:;
C1 IFREMER, Ctr Bretagne, Marine Struct Lab, F-29280 Plouzane, France.
   TUS, Thales Underwater Syst, F-06903 Sophia Antipolis, France.
   Arts & Metiers ParisTech, PIMM, F-75013 Paris, France.
C2 IFREMER, FRANCE
   TUS, FRANCE
   ARTS & METIERS PARISTECH, FRANCE
SI BREST
SE PDG-REM-RDT-LCSM
   PDG-REM-RDT-MS
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 3.562
TC 14
UR https://archimer.ifremer.fr/doc/00184/29546/27872.pdf
LA English
DT Article
DE ;Fracture;Rubber;Oxidation
AB Tensile properties and crack propagation properties, especially critical strain energy release rate in mode I, GIC, have been used to investigate fracture properties of elastomers and their relationships with microstructure. These investigations were mainly based on a series of comparisons: first, the behaviour of polychloroprene rubber (CR), undergoing stress hardening due to strain induced crystallization (SIC) and oxidative crosslinking (OCL) was compared with that of chlorinated polyethylene (CPE), which undergoes SIC but not OCL, and with a polyurethane based on hydroxyl terminated polybutadiene (PU) which undergoes OCL but not SIC. Comparisons were also made on CR between fracture behaviour at ambient temperature, where SIC occurs and at 100°C where there is no SIC. Finally, oxidative crosslinking was used to vary in a continuous way the crosslink density in CR and PU, in order to evaluate the role of crosslinking in fracture behaviour.  The results reveal the strong contribution of SIC to fracture strength. Crosslinking, even at low conversion, inhibits SIC which explains the sharp decrease of CR toughness in the early period of exposure to oxidation. When SIC has disappeared, it is possible to appreciate the effect of crosslinking on fracture behaviour. This effect, as evaluated from the density of deformation energy at rupture in tension or from GIC value, is almost negligible while the sample modulus increases regularly as a consequence of crosslinking. It appears that the toughness remains almost constant because it is under the influence of two contradictory phenomena: the negative effect of a reduction of ultimate elongation and the positive effect of a modulus increase. Such behaviour can be explained in terms of heterogeneous distribution of the lengths of elastically active chains. After long exposure, the sample behaviour becomes brittle, very high modulus values indicate that the samples approach, presumably in a heterogeneous way, the glassy state.
PY 2014
PD MAY
SO Polymer
SN 0032-3861
PU Elsevier Sci Ltd
VL 55
IS 10
UT 000335936500031
BP 2535
EP 2542
DI 10.1016/j.polymer.2014.03.023
ID 29546
ER

EF