The Vulcanisation of Elastomers with Bis (Dialkyl) Thiophosphoryl Disulphides

Abstract

Bis(diisopropyl)thiophosphoryl disulphide is used as a sulphur donor vulcanising system for cis-1,4-polyisoprene. It is shown that the network structure consists of polyand disulphidic crosslinks at early stages of cure, simplifying at optimum cure to monosulphidic crosslinks. Pendent accelerator groups bound to the rubber molecule form at early stages of cure, but are subsequently replaced by cyclic sulphidic groups. The good thermal and thermal oxidative ageing behaviour of the vulcanisate is due to the formation of zinc diisopropyldithiophosphate during vulcanisation. The level of technologically useful properties is low, but when used as a codonor with dimorpholyl disulphide a reasonable level of properties results. The codonor system vulcanises synthetic rubbers, notably styrene butadiene, ethylene propylene termonomer and nitrile elastomers, to give good scorch times, fast rates of cure and thermally stable modulus levels. Bis(diisopropyl)thiophosphoryl tri- and tetrasulphides are evaluated eas sulphur donors for cis-1,4-polyisoprene. These give higher levels of physical properties, whilst maintaining the simple network structure and good thermal and thermal oxidative ageing properties shown by the disulphide. As a result of the work, new accelerators are suggested for the vulcancanisation of cis-1,4-polyisoprene and general purpose synthetic elastomers.

Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: Copyright © JOHN GORDON PIMBLOTT, 1972. JOHN GORDON PIMBLOTT asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: vulcanisation,elastomers,bis(dialkyl)thiophosphoryl disulphides
Last Modified: 21 May 2024 13:13
Date Deposited: 12 Jan 2011 11:01
Completed Date: 1972
Authors: Pimblott, John G.

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