Three-arm star PIB ionomers

Three-arm star PIB ionomers were prepared by techniques described extensively before (16-17). Some relevant parameters for the sample are shown in Table I. The 3-arm PIB ionomers neutralized by NaOH were dried at room temperature under vacuum for 1 month, while another series of Na salts were dried at 140°C for a week. Samples were then compression molded at 150°C under an applied load of 4000 lbs/ in. Typical dimensions of the rectangular specimens for stress relaxation studies were 3.0 x 6.0 x 40 (mm). 

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