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Title: Peroxide-based crosslinking of solid silicone rubber, part II : the counter-intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure
Author(s): Azevedo, M.
Monks, A.-M.
Kerschbaumer, R. C.
Schlögl, StefanLook up in the Integrated Authority File of the German National Library
Saalwächter, KayLook up in the Integrated Authority File of the German National Library
Walluch, M.
Consolati, GiovanniLook up in the Integrated Authority File of the German National Library
Holzer, C.
Issue Date: 2023
Type: Article
Language: English
Abstract: Application of elastomers in general demands the conversion of their soluble networks into crosslinked structures. This abrupt change causes several modifications, both in the atomic/molecular level and at the macro-scale. In this study, solid silicone rubber (high molecular weight poly(dimethylsiloxane)), was crosslinked with dicumylperoxide (DCP), a widely used crosslinking agent by the rubber industry. The changes caused by different DCP concentrations were investigated, aiming to bring attention to the molecular transformations, usually neglected when processing-oriented studies are conducted. DCP concentration showed a limited contribution to the network's molecular dynamics, which was found to be mainly dominated by entanglements. The dominance of entanglements over other molecular constraints, like crosslink points, justifies the threshold and counter-intuitive behavior of tensile and hardness properties. However, differences were found in the crystallization ability after crosslinking, when the more crosslink points were introduced, the lower the crystallinity was and the less stable the PDMS crystallites were. In addition to providing a deeper understanding of an industrially applied rubber system n terms of the effective concentration of DCP, and the reasoning behind such concentration, the findings of this study add to the state-of-the-art comprehension of elastomeric networks, and how they behave on a molecular level.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: Journal of applied polymer science
Publisher: Wiley
Publisher Place: New York, NY [u.a.]
Volume: 140
Issue: 31
Original Publication: 10.1002/app.54111
Page Start: 1
Page End: 17
Appears in Collections:Open Access Publikationen der MLU