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Title: Role of stearic acid in the strain-induced crystallization of crosslinked natural rubber and synthetic cis-1,4-polyisoprene
Authors: Shinzo Kohjiya
Masatoshi Tosaka
Masahiro Furutani
Yuko Ikeda
Shigeyuki Toki
Benjamin S. Hsiao
Kyoto University
Mahidol University
Kyoto Institute of Technology
Stony Brook University
Keywords: Chemistry;Materials Science
Issue Date: 15-Jun-2007
Citation: Polymer. Vol.48, No.13 (2007), 3801-3808
Abstract: Strain-induced crystallization of crosslinked natural rubber (NR) and its synthetic analogue, cis-1,4-polyisoprene (IR), both mixed with various amounts of stearic acid (SA), were investigated by time-resolved X-ray diffraction using a powerful synchrotron radiation source and simultaneous mechanical (tensile) measurement. No acceleration or retardation was observed on NR in spite of the increase of SA amount. Even the SA-free IR crystallized upon stretching, and the overall crystallization behavior of IR shifted to the larger strain ratio with increasing SA content. No difference due to the SA was detected in the deformation of crystal lattice by stress for both NR and IR. These results suggested that the extended network chains are effective for the initiation of crystallization upon stretching, while the role of SA is trivial. These behaviors are much different from their crystallization at low temperature by standing, where SA acts as a nucleating agent. © 2007 Elsevier Ltd. All rights reserved.
ISSN: 00323861
Appears in Collections:Scopus 2006-2010

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