ゴム・スチレン樹脂の粘弾性 : 高分子レオロジー

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Rubber-styrene resin is a new type of polymer alloy, which can be polymerized at 60~90℃ for several hours from viscous mixtures of styrene monomer, rolled rubber and divinyl benzene catalysed by benzoyl peroxide, and cured at 120~150℃ for several hours after the shrinkage of the reacting system ended. This is a new type of cast resin which has a very low dielectric loss tangent, comparable to that of NBS type, and low cost and wider uses available in the field of electrical parts. Low frequency dynamic modulus and loss tangent of this resin were measured from -80℃ to 100℃, relating with the composition (styrene : 70~85% ; rubber 12~18% ; DVB 2~8% ; BPO 1%) on the dynamic mechanical properties show that DVB elevates the softening temperature, but rubber lowers it and increases mechanical loss. Measurements below room temperature reveal the remarkable mechanical absorption at -40~-50℃ which should be contributed from rubber molecules. The temperature at which the loss tangent has its maximum, did not seen to shift appreciably by changing composition of this resin. Secondly, for the constant composition, cure condition and after cure temperature, it has been shown that the high temperature mechanical loss decreases with increasing after cure time, but the low temperature mechanical loss increases with increasing after cure time. This fact may suggest some possibility of chain scission in rubber molecule kept at high temperature for long time. Our results have thrown some lights into the internal structure of this resin. Although the existence of some graft or network structure between rubber and polystyrene molecules cannot entirely be neglected, the results could be fairly well explained as " mixture", that is, rubber could exist as blend in polystryrene-DVB network structure.
1960-04-15

ゴム・スチレン樹脂の粘弾性 : 高分子レオロジー

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