摘要:
The invention relates to an unsaturated polyester resin containing a polyester or a polyester mixture, produced from at least one unsaturated dicarboxylic acid and at least one diol; and at least one silazane which is accessible for copolymerization with a C=C double bond of the dicarboxylic acid. The invention also relates to an unsaturated polyester resin moulding material which can be obtained or is obtained by cross-linking an unsaturated polyester resin as defined above. Said moulding material can optionally contain reinforcing materials. Said unsaturated polyester resin can be produced using the following steps: (a) a polyester from at least one diol and at least one unsaturated dicarboxylic acid is provided; (b) at least one silazane which is accessible for copolymerization which a C=C double bond of the dicarboxylic acid is provided; (c) the components are mixed according to (a) and (b). The unsaturated polyester resin moulding material can be produced from the above-mentioned polyester resin by hardening thereof by means of a radical initiator.
摘要:
The present invention relates to a copolymer which is obtainable by reacting acrylonitrile or a mixture of acrylonitrile and an organic molecule which can be copolymerized with acrylonitrile with at least one monomeric, oligomeric and/or polymeric silazane, said silazane containing at least one vinylic double bond. The copolymer can be converted to fiber form and/or made infusible. Fibrous copolymers can be used to produce ceramic fibers by pyrolysis.
摘要:
The invention relates to hybrid pre-polymers and polymers produced by converting difunctional, oligofunctional and/or polyfunctional cyanates and/or pre-polymers thereof with monomer, oligomer and/or polymer silazanes. The polymers are duromers having high glass transition temperature and very high fracture toughness from the respective cyanate output materials. They can be dissolved in a pre-polymerized state in solvents and are therefore suitable as impregnating resins for prepregs, for example. In addition, they can be processed to moulded articles. The fire characteristics thereof are particularly exceptional.
摘要:
The invention relates to a resol resin consisting of at least one aromatic component having a phenolic OH-group and at least one aldehyde component. The invention is characterised by regions which consist of organically modified polysiloxane embedded in the resol resin matrix, said polysiloxane comprising carbon-containing groups which are bound to the silicium at least partially in the form of unsubstituted or substituted alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups and are not bound to reactive groups of the resol resin by means of a covalent binding. The invention also relates to moulded bodies produced from said resin, composites made of a sheet material which is impregnated with the resin, then subsequently hardened, and to methods for producing the resin, the moulded bodies and the composites.
摘要:
The invention relates to a method for producing high-molecular weight, solid, meltable, thermoplastic, pre-ceramic polymers by converting liquid low-molecular weight polysilazanes in a solvent, in the presence of a catalyst, a stopping reagent stopping the reaction as soon as the desired degree of polymerization is achieved. The obtained polysilazanes can be processed by conventional industrial methods, such as, for example, extrusion, injection molding, melt spinning, calendering, film and hollow body blowing, rotational molding, fluidized bed sintering, flame spraying and transfer molding (RTM and DP_RTM).