By Andrew J. Tinker (auth.), Andrew J. Tinker, Kevin P. Jones (eds.)
Blends of common rubber with speciality artificial rubbers, reminiscent of nitrile rubber and ethylene propylene rubbers, have, long ago, didn't mix the easiest houses of polymers, leading to a terrible go back by way of additional price from the mixing approach. the assumption of mixing man made rubbers with traditional rubbe is unquestionably no longer a brand new one, however it is just now that this is often proven to be attainable with continually optimistic resluts, yet eh use of novel innovations which this e-book describes, giving beneficial details at the know-how required and the implications which are completed. Blends of ordinary Rubber is a useful resource of data for all these operating within the quarter of rubber expertise and polymer combination technology.
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Additional info for Blends of Natural Rubber: Novel Techniques for Blending with Speciality Polymers
Vulcanization was based on dicumyl peroxide for all rubbers, unless otherwise specified. The compounds were prepared on a two-roll mill. The curing characteristics of the compounds were assessed at 150°C using a Monsanto ODR 2000 rheometer. Sheets, 2 mm thick, were compression moulded and vulcanized in a press at 150°C to optimum cure (t90). The elastic constant, C v was determined from equilibrium modulus measurements performed on a Greensmith's machine . The values of the physically manifested crosslink concentration were then calculated via the Mooney-Rivlin relationship.
SEM: higher resolution than LM: useful for looking at overall blend morphology, but not for providing easy interpretation of phase structural details. • TEM: provides very high resolution images which contain a large amount of information: can be time consuming but remain essential for some aspects of the research including the swollen network technique described in Chapter 2. 17 STEM micrograph of a 60:40 NR:EPDM blend stained with osmium tetroxide . • STEM: provides a similar type and level of information to TEM: resolution of STEM is not as good as TEM, but is adequate for many needs and the results can be obtained significantly more quickly.
Thus it is necessary to swell vulcanizates for several days before endeavouring to obtain a spectrum. The work described in this chapter has sought to establish whether the technique for estimating crosslink densities in the component rubbers of a vulcanized blend can be translated to a solid-state NMR spectrometer by adopting appropriate operating procedures, and thereby facilitate the estimation of crosslink densities in vulcanized blends. Carbon 13C NMR spectroscopy is very useful for structure elucidation of polymeric compounds in solution.