摘要:
Matrix resin formulations comprising cyanate esters of phenol adducts of dicyclopentadiene, epoxy resins and particular thermoplastics, provide fiber reinforced composites with excellent toughness and hot/wet properties.
摘要:
Prepreg comprising structural fiber and matrix resin formulated from epoxys selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener insoluble in said composition in an amount effective to cure said epoxy resin exhibiting improved storage stability characteristics at room temperature.
摘要:
Layered, fiber-reinforced composites are toughened by the use of thermosetting matrix resins including polyphenylene ether particles. The method of the invention is particularly effective in improving the toughness of composites based on thermoset matrix resins.
摘要:
Fiber-reinforced compositions comprising a structural fiber and a cyanate ester resin formulation having an N-substituted urea compound as a latent cure accelerator provide rapid-curing prepreg with good out-time characteristics. The prepreg may be used to form composite articles with good toughness and excellent retention of properties on extended exposure to moisture at elevated temperatures. C
摘要:
Described herein is a composition comprising an epoxy resin containing at least one glycidyl amine group wherein the resin contains three or more epoxide groups per molecule and a particular aromatic amine hardener. These compositions possess the necessary balance of properties required for making prepreg and afford unreinforced castings with high moduli and strength.
摘要:
Epoxy resin formulations having improved storage stability comprising epoxys selected from the group consisting of polyglcidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener insoluble in said composition at room temperature in an amount effective to cure said epoxy resin.
摘要:
Curable thermosetting resin compositions comprising an epoxy resin having at least two 1,2-epoxy groups per molecule, an aromatic diamine hardener, and as a cure accelerator an aromatic trihydroxy compound are disclosed. The aromatic trihydroxy compound, such as for example, phloroglucinol, n-propyl gallate, or pyrogallol, improves the cure speed of the epoxy/aromatic diamine resin system, while at the same time producing cured compositions having excellent mechanical and thermal properties. The disclosed compositions find particular application in the preparation of composites by, e.g., filament winding procedures.
摘要:
The present application is directed to methods for preparation of polymer particles in gel form and carbon materials made therefrom. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors or batteries. The methods herein can also be employed generally to improve emulsion and/or suspension polymerization processes by improved control of diffusion of acidic and basic species between the polymer and secondary phases.
摘要:
An anhydride and resorcinol latent catalyst system for a phenolic resole resin provides a resin having long pot life and long shelf life, yet cures quickly thereafter.
摘要:
An anhydride and resorcinol latent catalyst system for a phenolic resole resin provides a resin having long pot life and long shelf life, yet cures quickly thereafter.