Polyhemiaminal (PHA) and polyhexahydrotriazine (PHT) materials are modified by 1,4 conjugate addition chemical reactions to produce a variety of molecular architectures comprising pendant groups and bridging segments. The materials are formed by a method that includes heating a mixture comprising solvent(s), paraformaldehyde, aromatic amine groups, aliphatic amine Michael donors, and Michael acceptors, such as acrylates. The reaction mixtures may be used to prepare polymer pre-impregnated materials and composites containing PHT matrix resin.

A production method for a fiber-reinforced composite material comprises: a step of stacking a prepreg plurally to obtain a prepreg-stacked body; and a step of heating the prepreg-stacked body to cure a resin, wherein the prepreg comprises: a reinforcing fiber layer including reinforcing fibers and a resin composition with which the space between fibers of the reinforcing fibers is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule; and a surface layer provided on at least one surface of the reinforcing fiber layer and containing (A) to (C) components, and (D) polyamide resin particles having an average particle size of 5 to 50 m.

Polyhemiaminal (PHA) and polyhexahydrotriazine (PHT) materials are modified by 1,4 conjugate addition chemical reactions to produce a variety of molecular architectures comprising pendant groups and bridging segments. The materials are formed by a method that includes heating a mixture comprising solvent(s), paraformaldehyde, aromatic amine groups, aliphatic amine Michael donors, and Michael acceptors, such as acrylates. The reaction mixtures may be used to prepare polymer pre-impregnated materials and composites containing PHT matrix resin.

Materials and methods are described herein that include forming a porous polymer network with antimicrobial and antifouling properties. The antifouling portion may be a polymer, such as polyethylene glycol, and the antimicrobial portion may be a metal, or a different cationic species, such as a quaternary ammonium salt. The method generally includes forming a reaction mixture comprising a formaldehyde, a bridging group, and moieties with antifouling and antimicrobial properties.

Described herein are crosslinked alkylated poly(benzimidazole) and poly(imidazole) polymer materials and devices (e.g., fuel cells, water electrolyzers) including these polymer materials. The polymer materials can be prepared in a convenient manner, allowing for applications such as anion exchange membranes (AEMs). The membranes provide high anion conductivities over a wider range of operating conditions when compared to the analogous membranes that are not cross-linked. The crosslinked polymer materials have improved alkaline stability, when compared to the analogous non-crosslinked polymer materials.

Pyrolized organic layers and conductive prepregs made therewith are provided.

A novel process for making PBI films starting from gel PBI membranes polymerized and cast in the PPA process wherein acid-imbibed gel PBIs are neutralized in a series of water baths and undergo controlled drying in association with a substrate material, yielding a PBI film without the use of organic solvents.

The present invention provides a curable resin composition having excellent fluidity and giving a cured product having excellent physical properties such as heat resistance, moisture resistance/solder resistance, flame retardance, and dielectric characteristics. The curable resin composition contains a resin (A) which has a benzoxazine structure represented by structural formula (A1) below and an epoxy resin (B) at such a ratio that when the total number of moles of the benzoxazine structure of the structural formula (A1) is , and the number of moles of epoxy groups in the epoxy resin (B) is , a ratio [/] is 0.1 to 0.5. ##STR00001##

Block copolymers have a general chemical structure of one of the formulas [A].sub.n-[B].sub.m and [B].sub.n-[A].sub.m, wherein [A] is a poly(2-oxazine) and wherein [B] is a poly(2-oxazoline). The block copolymers have desired thermogelling and rheological properties and are useful as carrier materials for active ingredients such as drugs, cells, proteins, and other active ingredients.

A resin composition according to the present invention contains a cyanate compound (A). Further, the resin composition according to the present invention contains a maleimide compound (B) and/or an epoxy resin (C); and primary hexagonal boron nitride particles (D) having an average aspect ratio of 4 to 10.