摘要:
An epoxy resin containing side-chain-tethered caged POSS and a preparation method thereof as well as epoxy resin material containing POSS-epoxy and a preparation method thereof are disclosed. The epoxy resin containing side-chain-tethered caged POSS (POSS epoxy) is formed by tethering of POSS group to the side chain of the diglycidyl ether of bisphenol A (DGEBA) epoxy resin. The preparation method of the POSS epoxy includes a step of reacting epoxy resin with caged POSS to form epoxy resin containing side-chain-tethered caged POSS (POSS-epoxy). The preparation method of epoxy resin material containing POSS-epoxy includes a step of reacting DGEBA epoxy resin with POSS-epoxy to get epoxy resin material containing POSS-epoxy. The POSS-epoxy is distributed evenly in the epoxy resin material with POSS-epoxy.
摘要:
A process for preparing a photoanode of dye-sensitized solar cells (DSSCs) is disclosed, which contains nano TiO2 and functionalized carbon nanomateiral. The process includes reacting a dispersion of functionalized carbon nanomateiral and a TiO2 precursor in a liquid organic medium under sol-gel conditions to form a carbon nanomaterial/nano TiO2 composite colloidal solution; mixing with an aqueous polymer solution, and forming a paste suitable for coating by concentrating the resulting mixture; coating the paste on a conductive glass substrate and calcining the coated layer at 300-520° C. in air for 10-60 minutes to obtain a conductive glass plate having a coating of nanocomposite, which can be used to prepare a photoanode of DSSCs by immersing in a dye solution to adsorb a dye thereon.
摘要:
The present invention relates to a pultrusion process for preparing fiber reinforced furan resin composites by drawing a plurality of continuous filaments through an impregnating bath of liquid furan to wet-out the filaments with the resin and a squeeze orifice for removal of excess resin and air, and continuously pulling the resin-impregnated filament through a pultrusion die to heat and cure the resin. The liquid furan resin contains a furfuryl alcohol prepolymer and a minor portion of an acid catalyst, and is maintained at a temperature of 15.degree.-35.degree. C. and has a viscosity of 500-3000 cps during the impregnating step. A postcuring treatment may be optionally employed to the pultruded fiber reinforced furan resin composites for improving their mechanical properties, which includes heating the pultruded composites at a temperature of 100.degree.-220.degree. C. for a period of 1-18 hours. Adding 1-15 wt % of mineral fillers may also improve the mechanical properties of the pultruded composites.
摘要:
A modified phenolic resin which is toughened by phenoxy resin is disclosed. The modified phenolic resin is prepared by the following steps: mixing a phenoxy resin having a weight average molecular weight of 10,000-1,000,000 and phenol in a weight ratio of phenoxy resin:phenol=1.5:1-1:1 at an elevated temperature to form a glutinous mixture; mixing the glutinous mixture and an acid catalyst to obtain a viscous mixture having a relatively low viscosity compared to the glutinous mixture; mixing the viscose mixture and a resole type phenolic resin to form a modified phenolic resin, wherein the resole type phenolic resin has a solid content of 60--75 wt. % and a free aldehyde content of 5-10 wt. %, the amount of the acid catalyst mixed is 2-10 wt. %, and the amount of the phenoxy resin mixed is 3-25 wt. % based on the resole type phenolic resin.
摘要:
A method for the preparation of a fiber reinforced modified phenolic resin composite, which comprises preparing a resole type phenolic resin having 60-75 wt % solid content and 5-10 wt % free aldehyde; preparing a blocked polyurethane resin having an average molecular weight of 2000-8000 and a viscosity of 500-1000 cps at 80.degree. C.; mixing the resole type phenolic resin, the blocked polyurethane resin and an acid catalyst at room temperature to form an impregnating resin, wherein the amount of the acid catalyst mixed is 2-10 wt %, based on the weight of the resole type phenolic resin, and the amount of the blocked polyurethane mixed is 5-20 wt %, based on the total weight of the mixed resins; and impregnating a plurality of filaments with the impregnating resin, and curing the impregnated filaments with a heat treatment to form a fiber reinforced modified phenolic resin composite.
摘要:
A composite bipolar plate for a polymer electrolyte membrane membrane fuel cell (PEMFC) is prepared as follows: a) melt compounding a polypropylene resin and graphite powder at 100-250° C. and 30-150 rpm to form a melt compounding material, the graphite powder content ranging from 50 wt % to 95 wt % based on the total weight of the graphite powder and the polypropylene resin, and the polypropylene resin being a homopolymer of propylene or a copolymer of propylene and ethylene, wherein 0.05-20 wt % carbon nanotubes, based on the weight of the polypropylene resin, are added during the melt compounding; and b) molding the melt compounding material from step a) to form a bipolar plate having a desired shaped at 100-250° C. and 500-4000 psi.
摘要:
The present invention is a process for pultruding fiber reinforced phenolic resin products, in which the phenolic resin normally has a viscosity ranging from 3,000 to 5,000 cps at 25.degree. C. and is heated to maintain a viscosity ranging from 800 to 2,000 cps during the impregnating step. A die having a temperature profile which is particularly suitable for use in the present process is also disclosed, which has substantially three different heating temperatures along the pultrusion direction. Furthermore, a postcuring treatment for improving the mechanical and physical properties of the pultruded products is also disclosed in the present invention.
摘要:
A method for manufacturing a conductive adhesive containing a one-dimensional (1D) conductive nanomaterial is revealed. The method produces a conductive adhesive by mixing the 1D conductive nanomaterial with water-based or solvent-based resin solution. The conductive adhesive has good industrial applications, not influenced by industrial adaptability and environmental adaptability. The conductive adhesive obtained also has better conductivity. Moreover, the amount of the 1D conductive nanomaterial used in the present invention is less than the amount of conductive nanoparticles used and the cost is reduced effectively.
摘要:
An epoxy resin containing side-chain-tethered caged POSS and a preparation method thereof as well as epoxy resin material containing POSS-epoxy and a preparation method thereof are disclosed. The epoxy resin containing side-chain-tethered caged POSS (POSS epoxy) is formed by tethering of POSS group to the side chain of the diglycidyl ether of bisphenol A (DGEBA) epoxy resin. The preparation method of the POSS epoxy includes a step of reacting epoxy resin with caged POSS to form epoxy resin containing side-chain-tethered caged POSS (POSS-epoxy). The preparation method of epoxy resin material containing POSS-epoxy includes a step of reacting DGEBA epoxy resin with POSS-epoxy to get epoxy resin material containing POSS-epoxy. The POSS-epoxy is distributed evenly in the epoxy resin material with POSS-epoxy.
摘要:
A two-part adhesive composition having superior adhesive strength at cryogenic temperatures contains a urethane resin composition part and a hardener part. The urethane resin composition part comprises 50 to 99% by weight of a modified polyurethane prepolymer having an epoxy group at each of its respective ends and 1 to 50% by weight of a modified urethane compound having substantially no ether cyanate (NCO) groups and at least two epoxy groups per molecule and a molecular weight of less than 800 daltons. The hardener part is a polyamine containing primary or secondary amine groups. The equivalent ratio of the amine groups of the polyamine to the epoxy groups of the urethane resin composition part is 0.5 to 2.0.