Journal
POLYMER
Volume 55, Issue 22, Pages 5584-5595Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.06.007
Keywords
Diene-rubber latex; Film formation; Thiol-ene chemistry
Categories
Funding
- Austrian Government
- State Government of Styria, Lower Austria
- State Government of Styria, Upper Austria
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The photo-vulcanization with versatile thiol-ene chemistry represents an innovative approach to crosslink diene-rubber materials both in latex and in solid film state. In this work, the structure of elastomer-based thiol-ene networks and the morphology after film formation are studied in detail using electron microscopic techniques, atomic force microscopy and multiple-quantum solid-state NMR spectroscopy. Additionally, film formation properties and corresponding macroscopic properties of photo-vulcanized natural rubber (NR) latex and its synthetic counterpart, isoprene rubber (IR) latex, are determined in dependence on the curing procedure (pre- and post-vulcanization). The results reveal that thiol-ene cured elastomers comprise homogenously distributed crosslinks with a low amount of short chain defects. Whilst photochemically pre-cured NR latex particles provide coherent films, the film formation and mechanical properties of IR are strongly governed by the crosslink density of the latex particles. In film state, photo-vulcanization promotes narrow crosslink distributions and excellent tensile properties of both NR and IR. (C) 2014 Elsevier Ltd. All rights reserved.
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