Role of short polyisoprene chains in storage hardening of natural rubber
Drying of natural rubber (NR) crumb (grade TSR10) requires high temperatures (100-120 °C). In order to determine the changes in bulk viscosity during the drying process, ageing kinetics at 120 °C were studied on model NR samples. During the process, changes in Mooney viscosity and weight-average molar mass (Mw) were monitored. Rubber from clones GT 1 and PR 107, with a bimodal inherent molar mass distribution (MMD0), was degraded in a two-phase process. During the first phase, Mooney viscosity and Mw increased, undoubtedly owing to a predominance of storage hardening over chain scissions [0 < t (min) <120]. During the second phase, chain scissions predominated (t > 120 min) and Mooney viscosity and Mw decreased. For rubber samples from clone PB 217, with a unimodal MMD0, no or reduced storage hardening was observed throughout the ageing process. These results showed that the key parameter involved in storage hardening seems to be the quantity of short polyisoprene chains and probably the nature of the chain ends. Copyright © 2003 Society of Chemical Industry
Main Authors: | , , , , , |
---|---|
Format: | article biblioteca |
Language: | eng |
Subjects: | Q60 - Traitement des produits agricoles non alimentaires, |
Online Access: | http://agritrop.cirad.fr/515150/ http://agritrop.cirad.fr/515150/1/515150.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-cirad-fr-515150 |
---|---|
record_format |
koha |
spelling |
dig-cirad-fr-5151502023-06-22T10:01:24Z http://agritrop.cirad.fr/515150/ http://agritrop.cirad.fr/515150/ Role of short polyisoprene chains in storage hardening of natural rubber. Ngolemasango F., Ehabe Ejolle Eugène, Aymard Christian, Sainte-Beuve Jérôme, Nkouonkam B., Bonfils Frédéric. 2003. Polymer International, 52 (8) : 1365-1369.https://doi.org/10.1002/pi.1225 <https://doi.org/10.1002/pi.1225> Researchers Role of short polyisoprene chains in storage hardening of natural rubber Ngolemasango, F. Ehabe, Ejolle Eugène Aymard, Christian Sainte-Beuve, Jérôme Nkouonkam, B. Bonfils, Frédéric eng 2003 Polymer International Q60 - Traitement des produits agricoles non alimentaires Drying of natural rubber (NR) crumb (grade TSR10) requires high temperatures (100-120 °C). In order to determine the changes in bulk viscosity during the drying process, ageing kinetics at 120 °C were studied on model NR samples. During the process, changes in Mooney viscosity and weight-average molar mass (Mw) were monitored. Rubber from clones GT 1 and PR 107, with a bimodal inherent molar mass distribution (MMD0), was degraded in a two-phase process. During the first phase, Mooney viscosity and Mw increased, undoubtedly owing to a predominance of storage hardening over chain scissions [0 < t (min) <120]. During the second phase, chain scissions predominated (t > 120 min) and Mooney viscosity and Mw decreased. For rubber samples from clone PB 217, with a unimodal MMD0, no or reduced storage hardening was observed throughout the ageing process. These results showed that the key parameter involved in storage hardening seems to be the quantity of short polyisoprene chains and probably the nature of the chain ends. Copyright © 2003 Society of Chemical Industry article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/515150/1/515150.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1002/pi.1225 10.1002/pi.1225 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=177967 info:eu-repo/semantics/altIdentifier/doi/10.1002/pi.1225 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1002/pi.1225 |
institution |
CIRAD FR |
collection |
DSpace |
country |
Francia |
countrycode |
FR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-cirad-fr |
tag |
biblioteca |
region |
Europa del Oeste |
libraryname |
Biblioteca del CIRAD Francia |
language |
eng |
topic |
Q60 - Traitement des produits agricoles non alimentaires Q60 - Traitement des produits agricoles non alimentaires |
spellingShingle |
Q60 - Traitement des produits agricoles non alimentaires Q60 - Traitement des produits agricoles non alimentaires Ngolemasango, F. Ehabe, Ejolle Eugène Aymard, Christian Sainte-Beuve, Jérôme Nkouonkam, B. Bonfils, Frédéric Role of short polyisoprene chains in storage hardening of natural rubber |
description |
Drying of natural rubber (NR) crumb (grade TSR10) requires high temperatures (100-120 °C). In order to determine the changes in bulk viscosity during the drying process, ageing kinetics at 120 °C were studied on model NR samples. During the process, changes in Mooney viscosity and weight-average molar mass (Mw) were monitored. Rubber from clones GT 1 and PR 107, with a bimodal inherent molar mass distribution (MMD0), was degraded in a two-phase process. During the first phase, Mooney viscosity and Mw increased, undoubtedly owing to a predominance of storage hardening over chain scissions [0 < t (min) <120]. During the second phase, chain scissions predominated (t > 120 min) and Mooney viscosity and Mw decreased. For rubber samples from clone PB 217, with a unimodal MMD0, no or reduced storage hardening was observed throughout the ageing process. These results showed that the key parameter involved in storage hardening seems to be the quantity of short polyisoprene chains and probably the nature of the chain ends. Copyright © 2003 Society of Chemical Industry |
format |
article |
topic_facet |
Q60 - Traitement des produits agricoles non alimentaires |
author |
Ngolemasango, F. Ehabe, Ejolle Eugène Aymard, Christian Sainte-Beuve, Jérôme Nkouonkam, B. Bonfils, Frédéric |
author_facet |
Ngolemasango, F. Ehabe, Ejolle Eugène Aymard, Christian Sainte-Beuve, Jérôme Nkouonkam, B. Bonfils, Frédéric |
author_sort |
Ngolemasango, F. |
title |
Role of short polyisoprene chains in storage hardening of natural rubber |
title_short |
Role of short polyisoprene chains in storage hardening of natural rubber |
title_full |
Role of short polyisoprene chains in storage hardening of natural rubber |
title_fullStr |
Role of short polyisoprene chains in storage hardening of natural rubber |
title_full_unstemmed |
Role of short polyisoprene chains in storage hardening of natural rubber |
title_sort |
role of short polyisoprene chains in storage hardening of natural rubber |
url |
http://agritrop.cirad.fr/515150/ http://agritrop.cirad.fr/515150/1/515150.pdf |
work_keys_str_mv |
AT ngolemasangof roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber AT ehabeejolleeugene roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber AT aymardchristian roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber AT saintebeuvejerome roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber AT nkouonkamb roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber AT bonfilsfrederic roleofshortpolyisoprenechainsinstoragehardeningofnaturalrubber |
_version_ |
1769605039367651328 |