<原著>重付加型シリコーンゴム印象材のゲル化機構

概要

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The gelation mechanism of a polyaddition type impression material was investigated by calorimetric and dynamic viscoelasticity measurements during the gelation. The relationship between the dynamic properties and the apparent extent of the reaction obtained by calorimetric measurements was not similar for materials mixed from different ratios of the base paste and the catalyst paste. The storage modulus of the sample with higher contents of silylidyne groups than vinyl groups rose more rapidly with the apparent extent of reaction, and the loss tangent lowered more rapidly. More excess of silylidyne, resulted in poorer elastic properties after gelation, attributed to unreacted species present in the material. Then optimal ratio of silylidyne groups to vinyl groups was about 1.2 to 1.0. The gelation mechanism is a very complicated process which is related to the functionality and molecular weight of the polymers, mixing ratio, and the effect of the catalyst. The gel point of the material may be determined approximately by the extent of reaction according to Flory's gelation theory.
北海道医療大学の論文
1987-06-30