Authors:R. Santra, T. Chaki, P. Mukunda, and G. Nando
Curing reactions of ethylene methyl acrylate (EMA) polydimethyl siloxane (PDMS) rubber blends have been investigated by differential
scanning calorimetry (DSC) and by Rheometry. The curing exoterms obtained from DSC curves have been analysed to derive the
kinetic parameters associated with the curing process. Crosslinking of EMA-PDMS rubber blends follow first order kinetics.
The effect of blend ratio and peroxide concentration on the crosslinking characteristics of the blends have also been investigated.
article contains a fragment of studies associated with the flammability and fire hazard of butadiene, butadiene–acrylonitrile and butadiene–styrene rubbers commonly used in the rubber industry.
Authors:M. López Manchado, J. Biagiotti, L. Torre, and J. Kenny
The effect of the incorporation of an amorphous immiscible polymer (ethylene-propylene-diene- terpolymer) on the PP crystallization
kinetics and thermodynamics is investigated by thermal analysis. The results of the investigation have shown that EPDM acts
as a nucleant agent. A marked decrease of the half time of PP crystallization, τ1/2 , as well as a sensible increase of the overall crystallization rate, Kn , has been observed in the presence of EPDM. Moreover, at any crystallization temperature, a minimum of τ1/2 , is obtained at 25% EPDM content in the blend. The Avrami model has been successfully applied to describe the crystallization
kinetics of the blend. The kinetic curves obtained under non-isothermal conditions confirm the results obtained under isothermal
conditions and demonstrate the nucleant action of the EPDM phase on the PP crystallization.
Authors:Przemysław Rybiński, Grażyna Janowska, Małgorzata Jóźwiak, and Agnieszka Pająk
combustibility of styrene–butadiene rubber. The results of these investigations have been compared with influence of montmorillonite modified by means of various organic compounds on the same properties of styrene–butadiene rubber
Authors:J. Azizi, D. Dollimore, G. R. Heal, W. A. Kneller, P. Manley, and C. C. Philip
The activity of carbon blacks recovered from elastomer systems is determined by use of a temperature jump technique imposed on the carbon blacks in air using a TG unit. The elastomer composites were composed of styrene-butadiene rubber (SRR), fillers, activators, accelerators together with a number of different carbon blacks. The organic content was pyrolyzed away by heating in nitrogen, the atmosphere was changed to air and the activity of the carbons was assessed by the temperature jump method. This enables the Arrhenius parameters to be established for the gasification of the carbons in air. This data was compared with the oxidation rates of carbons before they were introduced into the elastomer system. Nitrogen adsorption surface areas based on a BET analysis showed that the surface area of the carbons was similar before and after incorporation into the composite. The kinetic parameters of the carbons were however somewhat altered by incorporation into the elastomer systems, but their order of activity towards the gasification process as assessed by their relative rate of gasification remained the same. This is explained by postulating that the higher rates of oxidation is associated with the present of edge carbon atoms at the surface compared to the much slower oxidation rates of the “basel” plane carbon atoms. It appears that this surface structure is largely retained in the composite carbon-elastomer system. This enables some speculation regarding the reinforcing action of certain carbon blacks in the composite system.
Authors:Grażyna Janowska, Agnieszka Kucharska-Jastrząbek, and Przemysław Rybiński
matrix. A small addition of this kind of filler, about 3–5 parts by wt. per 100 parts by wt. of rubber appropriately dispersed in the polymeric matrix, creates a considerably larger surface of polymer–filler interaction than that of conventional fillers
Authors:S. Ľalíková, M. Pajtášová, M. Chromčíková, M. Liška, V. Šutinská, M. Olšovský, D. Ondrušová, and S. C. Mojumdar
) spectrometer Tensor 27 in the region 4000–400 cm −1 with a resolution of 4 cm −1 .
Preparation of natural rubber (NR)/clay composites
Natural rubber SMR-20 was used as the elastomeric matrix. Carbon black N660 was used as