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Article Dans Une Revue e-polymers Année : 2005

Characterization, structural transitions and properties of a tightly crosslinked polythiourethane network for optical applications

Résumé

A new polythiourethane thermosetting system based on a diisocyanate and a trithiol was studied. After characterization of the reactive species, two critical temperatures, namely T-g infinity (maximum glass transition temperature of the thermosetting system) and T-gel(g) (T-g of the material at the gel point), were determined. The conversion at gel point was also determined and compared to the theoretical prediction. Two different characteristics of the evolution of a reactive system, T-g and conversion x as a function of time, were related. This is of particular interest for understanding the curing process, especially when non-isothermal cure schedules are used. Viscoelastic and plastic properties were investigated, with the aim of establishing connections between the chemical structure and properties through detailed analysis of the polymer chain motions (beta and alpha relaxations). Measurements of the storage modulus at the rubbery plateau and of the critical strain intensity factor K-lc complete the study.
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Dates et versions

hal-00457355 , version 1 (17-02-2010)

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  • HAL Id : hal-00457355 , version 1

Citer

Boris Jaffrennou, Nicolas Droger, Jean Louis Halary, Jean-Pierre Pascault, Françoise Méchin. Characterization, structural transitions and properties of a tightly crosslinked polythiourethane network for optical applications. e-polymers, 2005, pp.article n°082. ⟨hal-00457355⟩
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