作者:Bruno Ameduri、Bernard Boutevin、Joël J.E Moreau、Hicham Moutaabbid、Michel Wong Chi Man
DOI:10.1016/s0022-1139(00)00211-6
日期:2000.7
Perfluoroalkyltrialkoxysilanes were prepared by hydrosilylation of the allylic or vinylic derivatives with trialkoxysilane or with trichlorosilane (followed by a quantitative methanolysis). The hydrolysis and polycondensation of these precursors were performed in the presence of tetrabutylammoniumfluoride (TBAF) as the catalyst, leading to a series of new polysilsesquioxanes, which were characterized by solid state C-13 and Si-29 CPMAS NMR. The porosity and surface area of these materials were determined by N-2 absorption experiments. Thermogravimetric analyses (TGA) were also performed. The surface properties of films prepared from these silsesquioxanes were studied by contact angle measurements. The hybrids having fluoroalkyl groups at the surface of the material showed a better thermostability and a higher hydrophobic and oleophobic character than their hydrocarbon analogues. (C) 2000 Elsevier Science S.A. All rights reserved.
[EN] The present invention relates to hyperbranched copolymer networks containing hyperbranched copolymers that have perfluorocarbon and organosilicon entities that have high hydrophobicity, or high oleophobicity, or high thermal stability, or good adhesion to substrates, or any combinations thereof. This invention provides a further desirable combination of properties that include solubility before crosslinking, chemical resistance, and easy processibility. The copolymers may be crosslinked with a variety of crosslinking agents to give either rigid or elastomeric networks. [FR] La présente invention concerne des réseaux de copolymères hyperramifiés, contenant des copolymères hyperramifiés qui ont des entités perfluorocarbonées et organosiliciés, qui ont une hydrophobie élevée, ou une oléophobie élevée, ou une stabilité thermique élevée, ou une bonne adhésion sur des substrats, ou toute combinaison de ceux-ci. La présente invention propose une combinaison désirable de propriétés supplémentaires, qui comprennent la solubilité avant réticulation, la résistance aux composés chimiques, et une usinabilité aisée. Les copolymères peuvent être réticulés avec une variété d'agents de réticulation pour donner des réseaux rigides ou élastomères.
Synthesis of telechelic dienes from fluorinated α,ω-diiodoalkanes. Part I. Divinyl and diallyl derivatives from model I(C2F4)nI compounds
The synthesis of five fluorinated non-conjugated dienes from commercially available α,ω-diiodoperfluoroalkanes is described. Preparation of the fluorinated divinyl derivatives H2C=CH(CF2)nCH=CH2 (n = 2, 4, 6) (2,2, 2,4 and 2,6) was effected by ethylenation of these diiodinated compounds in various ways followed by dehydroiodination in ethanolic potassium hydroxide. Allyl diolefines, H2C=CHCH2(CF2)nCH2CH=CH2
描述了由市售的α,ω-二碘全氟烷烃合成五个氟化的非共轭二烯。氟化二乙烯基衍生物的制备H 2 C = CH(CF 2)Ñ CH = CH 2(Ñ = 2,4,6)(2,2,2,4-和2,6-)通过这些二碘化化合物的ethylenation实现以各种方式,然后在乙醇氢氧化钾中进行加氢碘化。烯丙基二烯烃,H 2 C = CHCH 2(CF 2)n CH 2 CH = CH 2(4,4和4,6)是通过乙酸烯丙酯的α,ω-双端聚反应,然后在锌的存在下进行脱碘乙酰乙酸化而产生的。由于最终通过β-断裂分解α,ω-二碘全氟乙烷,因此获得了各自的二烯丙基4,4和4,6的二乙酸酯前体3,4和3,6,而不是二乙酸酯3,2。这五个氟化的非共轭二烯已通过1 H,13 C和19 F NMR光谱进行了表征。