Javier Carretero-GonzálezTiberio A. EzquerraSureerut AmnuaypornsriShigeyuki TokiRaquel VerdejoAlejandro SanzJitladda SakdapipanichBenjamin S. HsiaoMiguel A. López-ManchadoCSIC - Instituto de Ciencia y Tecnologia de Polimeros (ICTP)CSIC - Instituto de Estructura de la Materia (IEM)Mahidol UniversityStony Brook UniversityUniversity of Texas at Dallas2018-09-242018-09-242010-08-07Soft Matter. Vol.6, No.15 (2010), 3636-3642174468481744683X2-s2.0-77954821155https://repository.li.mahidol.ac.th/handle/123456789/28929In order to understand the molecular dynamics of natural rubber, the dielectric relaxation behavior of its different components were investigated. These components included: (1) the linear polyisoprene fraction, obtained after deproteinization and transesterification of natural rubber (TE-DPNR), (2) the gel (GEL) fraction, corresponding to pure natural chain-end cross-linked natural rubber, (3) deproteinized natural rubber (DPNR), in which the protein cross-links at the ω-end have been removed, and (4) natural rubber (CNR) purified (through centrifugation) but still containing proteins, phospholipids and the sol phases. The dielectric relaxation behaviour of natural rubber revealed a segmental mode (SM) which is not affected by natural chain-end cross-linking (so-called naturally occurring network) and a normal mode (NM) which depends on a naturally occurring network. The dynamics of the NM, which is associated to chain mobility, seems to be strongly affected by natural chain-end cross-linking. We propose a model based on a hybrid star polymer in which the low mobility core (phospholipids) controls the mobility of the polyisoprene arms. © 2010 The Royal Society of Chemistry.Mahidol UniversityChemistryPhysics and AstronomyArticleSCOPUS10.1039/c003087b