TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The functionalized poly(arylene ether) is a capped poly(arylene ether) having the structure, Q(J-K)y.Q = residuum of a monohydric, dihydric, or polyhydric phenol;y = 1-100;J = recurring units having the structure of formula (I);R1 - R4 = H, halogen, primary or secondary 1-12C alkyl, 2-12C alkenyl, 2-12C alkynyl, 1-12C aminoalkyl, 1-12C hydroxyalkyl, phenyl, 1-12C haloalkyl, 1-12C hydrocarbonoxy, or 2-12C halohydrocarbonoxy where at least two carbon atoms separate the halogen and oxygen atoms;m = 1-200;K = capping group consisting of -Y-R5 or compounds of formulae (1), or (2);R5 = 1-12C alkyl;R6 - R8 = H, 1-12C alkyl, 2-12C alkenyl, 6-18C aryl, 7-18C alkyl-substituted aryl, 7-18C aryl-substituted alkyl, 2-12C alkyloxycarbonyl, 7-18C aryloxycarbonyl, 8-18C alkyl-substituted aryloxycarbonyl, 8-18C aryl-substituted alkoxycarbonyl, nitrile, formyl, carboxylate, imidate, or thiocarboxylate;R9 - R13 = H, halogen, 1-12C alkyl, hydroxy, or amino;Y = divalent group of formulae (3), (4), (5), (6), or (7); andR14 and R15 = H or 1-12C alkyl.The capped poly(arylene ether comprises at least one capping group having a structure of formulae (II), (III), (IV), or (V).R6 - R8, R5, R9 - R13 = have meanings as defined; andA = saturated or unsaturated 2-12C divalent hydrocarbon group.The functionalized poly(arylene ether) is a ring-functionalized poly(arylene ether) comprising repeating units having a structure of formula (VI).L1 - L4 = H, alkenyl group of formula (8), or alkynyl group of formula (9);L5 - L7 = H or methyl;a = 1-4;L8 = H, methyl, or ethyl; andb = 1-4, where 0.02-25 mol% of the total L1 - L4 substituents in the ring-functionalized poly(arylene ether) are alkenyl and/or alkynyl groups.The functionalized poly(arylene ether) is free of amine substituents. It has an intrinsic viscosity of 0.15-0.30 deciliters/gram measured at 25degreesC in chloroform.The alkenyl aromatic monomer has the structure of formula (IX).The acryloyl monomer comprises at least one acryloyl moiety having a structure of formulae (X) or (XI).R16 = H, 1-12C alkyl, 2-12C alkenyl, 2-12C alkynyl, or 6-18C aryl;R17 = halogen, 1-12C alkyl, 1-12C alkoxyl, or 6-18C aryl;p = 1-4;q = 0-5;R18 and R19 = H or 1-12C alkyl, or may be disposed either cis or trans about the carbon-carbon double bond; andR20 - R22 = R6 - R8.The alkenyl aromatic monomer comprises alkenyl monomer consisting of styrene, alpha-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-t-butylstyrene, 3-t-butylstyrene, 4-t-butylstyrene, 1,3-divinylbenzene, 1,4-divinylbenzene, 1,3-diisopropenylbenzene, 1,4-diisopropenylbenzene, and/or styrenes having 1-5 halogen substituents on the aromatic ring.The acryloyl monomer comprises at least two or three acryloyl moieties. The acryloyl monomer comprises at least one acryloyl monomer consisting of trimethylolpropane tri(meth)acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, cyclohexanedimethanol di(meth)acrylate, butanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, isobornyl (meth)acrylate, and/or methyl (meth)acrylate.Preferred Composition:The composition preferably comprises (pbw):(1) functionalized poly(arylene ether) (1-70);(2) acryloyl monomer (1-69);(3) alkenyl aromatic monomer (30-98);(4) conductive agent (5-95), where the parts by weight of the functionalized poly(arylene ether), the alkenyl aromatic monomer, and the acryloyl monomer sum to 100, and the amount of the conductive agent is based on the total weight of the composition.The composition further comprises:(1) conductive agent;(2) a curing catalyst;(3) a curing promoter; and(4) an additive consisting of flame retardants, flame retardant synergists, mold release agents and other lubricants, antioxidants, thermal stabilizers, ultraviolet stabilizers, pigments, dyes, colorants, anti-static agents, fibrous reinforcements, disc-shaped fillers, low-aspect ratio fillers, synthetic resins, natural resins, thermoplastic elastomers, and/or low profile additives.The composition preferably comprises (pbw):(1) methacrylate-capped poly(arylene ether) (10-50);(2) monofunctional alkenyl aromatic monomer (40-80);(3) polyfunctional acryloyl monomer (5-50);(4) curing catalyst (1-5); and(5) graphite (20-95) where parts by weight of the methacrylate-capped poly(arylene ether), the monofunctional alkenyl aromatic monomer, the polyfunctional acryloyl monomer, and the curing catalyst are based on 100 total parts for the methacrylate-capped poly(arylene ether), the monofunctional alkenyl aromatic monomer, and the polyfunctional acryloyl monomer, and the weight percent of the graphite is based on the total weight of the composition.The composition after curing has a glass transition temperature of at least 120degreesC.Preferred Method: Blending comprises mixing with a mixing energy of 0.025-50 kJ/L, mixing power of 5-70 watts/liter, and with a tip speed of 0.05-35 m/sec.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The composition further comprises a multivalent metal ion from groups IIA, IIIA, or IB-VIIIB of the periodic table. The conductive agent consists of graphite, conductive carbon black, conductive carbon fibers, metal fibers, metal particles, or particles of intrinsically conductive polymers (preferably graphite). The conductive agent comprises conductive carbon fibers having an average diameter of 3.5-500 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Catalyst: The curing catalyst is benzoyl peroxide, dicumyl peroxide, methyl ethyl ketone peroxide, lauryl peroxide, cyclohexanone peroxide, t-butyl hydroperoxide, t-butyl benzene hydroperoxide, t-butyl peroctoate, 2,5-dimethylhexane-2,5-dihydroperoxide, 2,5-dimethyl-2,5-di(t-butylperoxy)-hex-3-yne, di-butylperoxide, t-butylcumyl peroxide, alpha,alpha'-bis(t-butylperoxy-m-isopropyl)benzene, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, dicumylperoxide, di(t-butylperoxyi isophthalate, t-buylperoxybenzoate, 2,2-bis(t-butylperoxy)butane, 2,2-bis(t-butylperoxy)octane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, di(trimethylsilyl)peroxide, trimethylsilylphenyltriophenylsilyl peroxide, 2,3-dimethyl-2,3-diphenylbutane, and/or 2,3-trimethylsilyloxy-2,3-diphenylbutane.The curing promoter is cobalt naphthanate, N,N-dimethylaniline, and/or N,N-diethylaniline. Preferred Definitions: (i)    Q = residuum of a monohydric phenol; and    (ii)    R9 or R13 = hydroxyl.    EXAMPLE - Capped poly(phenylene ether) solution in styrene, polyfunctional acrylate comonomer (trimethylolpropane triacrylate, 15 g), and additional styrene (if required) were mixed and heated to 70degreesC to form a homogeneous solution. The solution was hand mixed with graphite (408 g) to form a particulate solid. A prototype bipolar plate tool was heated to 295degreesF and sprayed with a fluorocarbon mold release. Resin/graphite mixture (70 g) was poured into the tool and the mixture was compression molded. The composition showed good appearance. It had a glass transition temperature (Tg) of 136degreesC, coefficient of thermal expansion (CTE) below Tg of 18.2x10-6/degreesC, CTE above Tg of 42x10-6/degreesC, and surface conductivity of 112 S/cm.