Showing papers on "Plastomer published in 1984"
01 Jan 1984
TL;DR: In this paper, the authors present the results of their attempts to increase the probability of grafting in a large-scale system, using a mixture of elastomers as a reactive component of the mixture.
Abstract: Plastomers are often used for modification of elastomers, and they usually form a discrete phase. As could be expected, interfacial grafting should improve the properties of such heterogeneous systems, but there are many difficulties in effecting this reaction in bulk. Under the influence of an initiator, an elastomer as a more reactive component of the mixture is first of all crosslinked. This report presents the results of our attempts to increase the probability of grafting.
01 Jan 1984
TL;DR: In this paper, the presence of polyacrylonitrile in a mixture of elastomers and plastomers was found to cause an increase in viscosity and tensile strength of unsaturated elastomer.
Abstract: Heterogeneous mixtures of elastomers and plastomers are of practical importance and have been widely investigated. As a result of a small difference in solubility parameter values a diffusion boundary between components of a mixture or an interfacial chemical bonding between polymers are formed. It is commonly accepted that good mechanical properties of such a systems in the two mentioned cases are observed. It is also evident that mixing conditions and a morphology of a mixture play an important role. In this work it was rather unexpectedly stated that the presence of polyacrylonitrile in blends causes strong increase of viscosity and tensile strength of unsaturated elastomers. Those effects are clearly related to double bonds content in elastomer. A lowered segmental mobility of a matrix in the vicinity of plastomer domains was observed by means of mechanical spectrometry and pulsed NMR methods. It is concluded that the charge transfer mechanism between cyano groups of polyacrylonitrile and double bonds is probably responsible for that phenomenon. This hypothesis was confirmed on the basis of IR and UV spectroscopy examinations of model substances: dodecene-1 and butyronitrile. The constitution of the complex was established and the enthalpy of its formation calculated.