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Dynamic light scattering and reduced viscosity measurements on dilute solutions of sodium sulfonated polystyrene (NaSPS) ionomers of molecular weight 1 10 5 g mol -1 and sulfonation levels of 0, 0.62, 0.95 and 1.39 mol% in xylene are described and compared with earlier static light and small-angle neutron scattering studies. The unsulfonated polystyrene and 0.62 mol% ionomer...
Precipitated silica improves the physical properties of a zinc-sulfonated ethylene-propylene-diene terpolymer (SEPDM) of high (i.e. 75 wt%) ethylene content. The properties studied include hardness, stress-strain characteristics, tear strength, abrasion resistance and hysteresis. Processability studies carried out by using the Monsanto Processability Tester (MPT) show that silica increases the melt...
Zinc sulfonated EPDM of high (75 wt%) ethylene content behaves as an ionic thermoplastic elastomer. Diethylene glycol plasticizes the ionic domains of zinc sulfonated EPDM, without affecting the hydrocarbon backbone. Studies include measurement of physical properties, processability studies in a Monsanto processability tester (MPT), dynamic mechanical analyses (d.m.a.) and dielectric thermal analyses...
Blends of the zinc salt of poly(ethylene-co-methacrylic acid) (ZnEMA) and the zinc salt of sulfonated ethylene-propylene-diene monomer rubber (SEPDM), show thermoplastic elastomeric behaviour. The physical properties of the blends are greater than that predicted by the additivity rule. Results of dynamic mechanical analyses show ionic transitions in addition to T g in the case of neat polymers...
Small-angle neutron scattering has been used to determine the dimensions of single chains within the aggregates formed in the solvent p-xylene by a sodium sulfonated polystyrene ionomer (SPS). This polymer has a molecular weight of 10 5 g mol -1 and sulfonation level of 1.25 mol %. The dimensions were obtained by using a mixture of normal and deuterated polymer to achieve contrast...
Zinc sulfonated ethylene-propylene-diene terpolymer (EPDM) behaves as an ionic thermoplastic elastomer. Both paraffin oil and dimethyl sulfoxide (DMSO) act as plasticizers for this polymer; while paraffin oil plasticizes the hydrocarbon backbone, DMSO plasticizes the ionic domains. Results obtained from dynamic mechanical analysis (d.m.a.) show that DMSO does not affect the glass-rubber transition...
High abrasion furnace carbon black improves the physical properties of zinc sulfonated ethylene-propylene-diene terpolymer of high (75 wt%) ethylene content. Properties studied include hardness, stress-strain characteristics, tear strength, hysteresis and abrasion resistance. Scanning electron photomicrographs of the tear fractured and abraded surfaces show changes in failure mode of the polymer...
Both paraffinic oil and zinc stearate act as plasticizers for carbon black filled zinc sulfonated EPDM of high ethylene content. While paraffinic oil plasticizes the backbone chain and functions at ambient conditions, the plasticizing ability of zinc stearate is observable only at high temperatures (that is, > 129 o C, melting point of zinc stearate) and it plasticizes the ionic domains...
Miscibility in the binary system of deuterated polystyrene and lightly sulfonated polystyrene has been investigated. Small-angle neutron scattering was used to evaluate the physical state of deuterated polystyrene/polystyrene-1.67% sulfonic acid blends over a wide composition range. Scattering behaviour was found to agree with the Debye-Bueche theory indicating that the blends were phase-separated...
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