The invention is directed to a composite structure in which a metal member having a roughened surface and a resin member are joined in a state in which at least a portion of the roughened surface is included. The resin member is made of a molded article obtained by melt-molding a polyarylene sulfide resin composition containing a polyarylene sulfide resin. In the roughened surface, a cumulative pore volume of a pore diameter in a range of 0.1 m to 20 m is in a range of 0.5 nL/mm.sup.2 or more and 5 nL/mm.sup.2 or less measured by mercury porosimetry. According to the invention, it is possible to provide a composite structure that is obtained by joining a metal member and a molded article made of polyarylene sulfide resin composition and is more excellent in joining strength, heat cycle resistance, and sealing properties, and a method for producing the composite structure.

Provided is a PAS molded article in which an increase in tackiness due to retention is suppressed and generated gas is reduced. Specifically, provided are a PAS resin composition obtained by mixing a PAS resin with a thermoplastic elastomer and/or a silane coupling agent, wherein the PAS resin is a crosslinked PAS resin, and has a region where tan at 280 C. to 330 C. is less than 1 at an angular frequency 1/s in the measurement of dynamic viscoelasticity, the amount of the thermoplastic elastomer mixed is 12 parts by mass or less relative to 100 parts by mass of the PAS resin, and/or the amount of the silane coupling agent mixed is 1.0 part by mass or less relative to 100 parts by mass of the PAS resin, and the viscosity change rate is 150% or less, a molded article, and methods for producing these.

Provided is a PAS molded article in which an increase in tackiness due to retention is suppressed and generated gas is reduced. Specifically, provided are a PAS resin composition obtained by mixing a PAS resin with a thermoplastic elastomer and/or a silane coupling agent, wherein the PAS resin is a crosslinked PAS resin, and has a region where tan at 280 C. to 330 C. is less than 1 at an angular frequency 1/s in the measurement of dynamic viscoelasticity, the amount of the thermoplastic elastomer mixed is 12 parts by mass or less relative to 100 parts by mass of the PAS resin, and/or the amount of the silane coupling agent mixed is 1.0 part by mass or less relative to 100 parts by mass of the PAS resin, and the viscosity change rate is 150% or less, a molded article, and methods for producing these.

Described herein are poly(arylene sulfide) (PAS) polymers (PASP) including recurring units formed from selected dihalofluorene monomers. Surprisingly, at relative low dihalofluorene monomer concentrations, the PAS polymers (PASP) have significantly increased glass transition temperatures (T.sub.g) and impact performance, relative to analogous PAS homopolymers and PAS polymers (PASP) including recurring units formed from 4,4-dibromobiphenyl (DBBP). Simultaneously, the PAS polymers (PASP) also retain high elastic modulus. Furthermore, the PAS polymers (PASP) are free of recurring units formed from polyhalogenated biphenyls (e.g. DBBP and polychlorinated biphenyls) and, therefore, are not currently subject to restrictive governmental regulation. Due at least in part to the excellent thermal (T.sub.g, T.sub.c and T.sub.m) and impact properties of the PAS polymers (PASP), the PAS polymers (PASP) and PAS polymer compositions can be desirably incorporated into wide variety of articles including, but not limited to, automotive articles, electrical and electronic articles, articles for aerospace and oil and gas articles.

The present disclosure discloses a method for preparing high-activity polyphenylene sulfide (PPS) by regulating and controlling a water content in a polymerization process and a high-efficiency polyphenylene sulfide resin prepared thereby. The preparation method includes: carrying out a polycondensation reaction with sodium hydrosulfide and p-dichlorobenzene as raw materials and N-methyl-2-pyrrolidone as a solvent until a conversion rate of the p-dichlorobenzene reaches 97% or above, adding deionized water, reducing the temperature in a reactor to 250-260 C. for heat preservation for 1-3 h, and performing cooling for post-treatment; and calculated with the sodium hydrosulfide as 1.0 mol, a molar amount of the added deionized water is 1.0-2.5 mol. The method for preparing high-activity polyphenylene sulfide disclosed in the present disclosure can be simultaneously realized in a PPS polymerization process, and that is to say, an end-capping reagent is not required to be additionally added to affect the molecular weight and thermal stability of the finally prepared PPS; and activation treatment is also not required to be performed after the PPS resin is prepared to additionally increase the technological process and the production cost.

The present disclosure discloses a method for preparing high-activity polyphenylene sulfide (PPS) by regulating and controlling a water content in a polymerization process and a high-efficiency polyphenylene sulfide resin prepared thereby. The preparation method includes: carrying out a polycondensation reaction with sodium hydrosulfide and p-dichlorobenzene as raw materials and N-methyl-2-pyrrolidone as a solvent until a conversion rate of the p-dichlorobenzene reaches 97% or above, adding deionized water, reducing the temperature in a reactor to 250-260 C. for heat preservation for 1-3 h, and performing cooling for post-treatment; and calculated with the sodium hydrosulfide as 1.0 mol, a molar amount of the added deionized water is 1.0-2.5 mol. The method for preparing high-activity polyphenylene sulfide disclosed in the present disclosure can be simultaneously realized in a PPS polymerization process, and that is to say, an end-capping reagent is not required to be additionally added to affect the molecular weight and thermal stability of the finally prepared PPS; and activation treatment is also not required to be performed after the PPS resin is prepared to additionally increase the technological process and the production cost.

A method for producing a polyarylene sulfide comprising: initiating a polymerization reaction by heating a mixture containing an organic polar solvent, a sulfur source, water, a polyhaloaromatic compound, and an alkali metal hydroxide in the presence of at least one auxiliary agent selected from the group consisting of carboxylates and the like, to form a reaction mixture containing a prepolymer having a conversion rate of a polyhaloaromatic compound of 50 mol % or greater, then a phase separation agent addition step of adding a phase separation agent into the reaction mixture, then continuing the polymerization reaction, and then cooling the reaction mixture, in the cooling step, the coolant being added to the reaction mixture at a temperature that is at least 5 C. higher than a maximum thickening temperature and lower than 250 C., and a cooling rate at the maximum thickening temperature being 2.2 C./min or higher and 3.9 C./min or lower.

A method for producing a polyarylene sulfide comprising: initiating a polymerization reaction by heating a mixture containing an organic polar solvent, a sulfur source, water, a polyhaloaromatic compound, and an alkali metal hydroxide in the presence of at least one auxiliary agent selected from the group consisting of carboxylates and the like, to form a reaction mixture containing a prepolymer having a conversion rate of a polyhaloaromatic compound of 50 mol % or greater, then a phase separation agent addition step of adding a phase separation agent into the reaction mixture, then continuing the polymerization reaction, and then cooling the reaction mixture, in the cooling step, the coolant being added to the reaction mixture at a temperature that is at least 5 C. higher than a maximum thickening temperature and lower than 250 C., and a cooling rate at the maximum thickening temperature being 2.2 C./min or higher and 3.9 C./min or lower.

Provided are a purification method for a polyarylene sulfide (PAS) that can efficiently reduce the amount of a carboxyalkylamino group-containing compound in the PAS by treating the carboxyalkylamino group-containing compound in the PAS under a low pressure without using a strong acid, and a production method for a PAS having a reduced amount of the carboxyalkylamino group-containing compound in the PAS. The purification method for a PAS includes: a step of obtaining a crude PAS-containing mixture by removing a solvent from a crude reaction product containing the PAS obtained by reacting a polyhalo aromatic compound with a sulfidizing agent in an organic polar solvent; a step of bringing the crude PAS mixture into contact with water and an oxygen atom-containing solvent to convert the crude PAS into porous particles; and a step of bringing the obtained porous particles into contact with carbonated water.

Provided are a purification method for a polyarylene sulfide (PAS) that can efficiently reduce the amount of a carboxyalkylamino group-containing compound in the PAS by treating the carboxyalkylamino group-containing compound in the PAS under a low pressure without using a strong acid, and a production method for a PAS having a reduced amount of the carboxyalkylamino group-containing compound in the PAS. The purification method for a PAS includes: a step of obtaining a crude PAS-containing mixture by removing a solvent from a crude reaction product containing the PAS obtained by reacting a polyhalo aromatic compound with a sulfidizing agent in an organic polar solvent; a step of bringing the crude PAS mixture into contact with water and an oxygen atom-containing solvent to convert the crude PAS into porous particles; and a step of bringing the obtained porous particles into contact with carbonated water.