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Influence of functional rubbers on the curing process of unsaturated polyester resins

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Abstract

The influence of an elastomeric second-phase on the kinetics of the curing reaction and the gel-time of a standard unsaturated polyester resin, by using the isothermal and dynamic techniques of differential scanning calorimetry (DSC) and a thermocouple was investigated. In particular we examined two different rubbers (polybutadiene hydroxyl-terminated and polybutadiene isocyanate-terminated), that, in the presence of polyester resins, affect the overall curing reaction kinetics in two ways: the former reduces the rate of reaction whilst the latter increases it.

Zusammenfassung

Der Einfluß einer elastomeren Zweitphase auf die Kinetik der Aushärtung und der Gelierungszeit eines als Standard dienenden ungesättigten Polyesterharzes wurden mittels isothermer und dynamischer DSC untersucht. Insbesondere wurden zwei unterschiedliche Gummis (hydroxylendständiges und isocyanatendständiges Polybutadien) untersucht, die die Kinetik der Aushärtung des Polyasterharzes in unterschiedlicher Weise beeinflussen: hydroxylendständiges Polybutadien verringert, isocyanatendständiges dagegen erhöht die Reaktionsgeschwindigkeit.

Резюме

Используя изотермич ескую и динамическую ДСК, а также термопару, изу чено влияние эластомерно й вторичной фазы на ки нетику реакции отверждения и время гелеобразова ния обычной ненасыщенно й полиэфирной смолы. Д обавка полибутадиенового каучука с различными концевыми группами (гидроксильной и изоц ианатной) оказывает различное влияние на полную реакцию отвер ждения полиэфирной смолы: ка учук с концевой гидроксильной групп ой понижает скорость реакции, а каучук с изотиоциана тной группой — увелич ивает.

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Avella, M., Martuscelli, E. & Volpe, M.G. Influence of functional rubbers on the curing process of unsaturated polyester resins. Journal of Thermal Analysis 34, 441–450 (1988). https://doi.org/10.1007/BF01913183

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  • DOI: https://doi.org/10.1007/BF01913183

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