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Synthèse et caractérisation de copolymères Silicone/Polyuréthane réticulés pour l'encapsulation de modules de puissance

Abstract : Embedded electronics, particularly power modules, allows management of electric energy and therefore development of “carbon-free” vehicle. However, these electronic components, will shortly be located near heat engine automotive, and they must withstand various environments and sometimes, hard stresses (humidity, chemical aggression (oil), vibrations…). But actual encapsulation materials are not today efficient enough to match with these future imposed stresses. Thus, the aim of this work is to develop new encapsulation polymers. For this, two types of crosslinked Silicone/Polyurethane (Si/PU) copolymers were “solvent-free” synthesized and with short polymerization times.A first series of materials Si/PU containing between 55 and 76%wt silicone units were synthesized by alcool-iscyanate polyaddition from silicone precursor, synthesized or commercial, and a pluri-isocyanate, in the presence of catalyst. A second series of copolymers, Silicone/Polyhydroxyurethane (Si/PHU) containing 26 and 61%wt silicone units, was obtained without isocyanate or catalyst from poly(dimethylsiloxane) biscyclocarbonate and a triamine.Mechanical and thermal properties as well as hydrophobic character of all materials were evaluated. In order to improve thermal properties and decrease the cost of encapsulation resin, inorganic fillers were blended in some of Si/PU polymers.The most interesting materials were tested as encapsulant in power modules, and the first electrical measurements during thermal cyclings were very promising
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Charlotte Colin. Synthèse et caractérisation de copolymères Silicone/Polyuréthane réticulés pour l'encapsulation de modules de puissance. Chimie organique. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLV028⟩. ⟨tel-01825024⟩

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