A preparation method for a spherical or angular powder filler, comprising: providing spherical or angular siloxane comprising a T unit, wherein the T unit is R.sub.1SiO.sub.3−, and R.sub.1 is a hydrogen atom or an organic group which can be independently selected from carbon atoms 1-18; and performing heat treatment on the spherical or angular siloxane under an inert gas atmosphere or atmospheric atmosphere, the heat treatment temperature being between 250 degrees and 650 degrees, so that silicon hydroxyl groups in the spherical or angular siloxane are condensed to obtain the spherical or angular powder filler. In the unit T of the spherical or angular powder filler, the content of the unit without containing a hydroxyl group in the total unit is greater than or equal to 95%, and the content of the unit containing one hydroxyl group in the total unit is less than or equal to 5%. Also disclosed are the spherical or angular powder filler obtained by the preparation method, and application thereof. The spherical or angular powder filler has low permittivity, low water absorption and low radioactivity.

A towpreg that is easy to unwind from a bobbin, has good width accuracy after unwinding and can produce a composite material with excellent heat resistance, and a resin composition that gives such a towpreg.

A towpreg is characterized by being impregnated with an epoxy resin that contains an epoxy resin which is solid at 23° C. in an amount of 30 parts or more in 100 parts by mass of total epoxy resin components, contains a polyfunctional amine type epoxy resin which is liquid at 23° C. in an amount of 20 parts or more in 100 parts by mass of total epoxy resin components, and further contains a clay mineral.

A hybrid hydrogel carrier for high-salinity wastewater treatment and a preparation method thereof are disclosed. The hybrid hydrogel carrier includes a functional microorganism and a conductive hydrogel carrier, wherein the functional microorganism is a halotolerant species; the conductive hydrogel carrier is a compatible conductive hybrid hydrogel, and magnetic triiron tetraoxide (Fe.sub.3O.sub.4) particles and a compatible substance are uniformly distributed on the surface and inside. The preparation method includes dissolving an aniline solution and a phytic acid solution in a polyvinyl alcohol solution, and cooling the mixed solution to obtain solution I; dispersing a microbial solution, the compatible substance and the Fe.sub.3O.sub.4 particles into the solution I to obtain solution II; dissolving ammonium persulfate in deionized water to prepare an ammonium persulfate solution, after cooling the solution, mixing quickly with the solution II to obtain solution III, then freezing and thawing the solution III repeatedly to obtain the hybrid hydrogel carrier.

The present invention includes a hydrogel and a method of making a porous hydrogel by preparing an aqueous mixture of an uncrosslinked polymer and a crystallizable molecule; casting the mixture into a vessel; allowing the cast mixture to dry to form an amorphous hydrogel film; seeding the cast mixture with a seed crystal of the crystallizable molecule; growing the crystallizable molecule into a crystal structure within the uncrosslinked polymer; crosslinking the polymer around the crystal structure under conditions in which the crystal structure within the crosslinked polymer is maintained; and dissolving the crystals within the crosslinked polymer to form the porous hydrogel.

Microencapsulation methods are provided using encapsulant, fiber or film forming compositions of a cross-linkable anionic polymer, a multivalent cation salt, a chelating agent, and a volatile base. During the formation of this composition, the generally acidic chelating agent is titrated with a volatile base to an elevated pH to improve ion-binding capability. Multivalent cations are sequestered in cation-chelate complexes. Cross-linkable polymers in this solution will remain freely dissolved until some disruption of equilibrium induces the release of the free multivalent cations from the cation-chelate complex. Vaporization of the volatile base drops the pH of the solution causing the cation-chelate complexes to dissociate and liberate multivalent cations that associate with the anionic polymer to form a cross-linked matrix. During spray-drying, the formation of a wet particle, polymer cross-linking, and particle drying occur nearly simultaneously.

According to one embodiment, a system for manufacturing a polymethyl methacrylate (PMMA) prepreg includes a mechanism for continuously moving a fabric or mat and a resin application component that applies a methyl methacrylate (MMA) resin to the fabric or mat. The system also includes a press mechanism that presses the fabric or mat during the continuous movement subsequent to the application of the MMA resin to ensure that the MMA resin fully saturates the fabric or mat. The system further includes a curing oven through which the fabric or mat is continuously moved. The curing oven is maintained at a temperature of between 40° C. and 100° C. to polymerize the MMA resin and thereby form PMMA so that upon exiting the curing oven, the fabric or mat is fully impregnated with PMMA.

According to one embodiment, a system for manufacturing a fully impregnated thermoplastic prepreg includes a mechanism for moving a fabric or mat and a drying mechanism that removes residual moisture from at least one surface of the fabric or mat. The system also includes a resin application mechanism that applies a reactive resin to the fabric or mat and a press mechanism that presses the coated fabric or mat to ensure that the resin fully saturates the fabric or mat. The system further includes a curing oven through which the coated fabric or mat is moved to polymerize the resin and thereby form a thermoplastic polymer so that upon exiting the oven, the fabric or mat is fully impregnated with the thermoplastic polymer. During at least a portion of the process, humidity in the vicinity of the coated fabric or mat is maintained at substantially zero.

The present invention includes a hydrogel and a method of making a porous hydrogel by preparing an aqueous mixture of an uncrosslinked polymer and a crystallizable molecule; casting the mixture into a vessel; allowing the cast mixture to dry to form an amorphous hydrogel film; seeding the cast mixture with a seed crystal of the crystallizable molecule; growing the crystallizable molecule into a crystal structure within the uncrosslinked polymer; crosslinking the polymer around the crystal structure under conditions in which the crystal structure within the crosslinked polymer is maintained; and dissolving the crystals within the crosslinked polymer to form the porous hydrogel.

The present invention relates to a method for producing a composite structure comprising a magnetic filler material embedded in a resin matrix. So far, a balance between sufficient magnetic performance and mechanical fatigue resistance, for applications involving cyclic strains of hundreds of thousands of cycles, has not been achieved, largely due to the poor compatibility between metallic and plastic surfaces. The present invention solves this problem by embedding magnetic filler material in a resin, after the magnetic filler material has been subjected to a possible surface treatment for improving the adhesion of the magnetic filler material to the resin matrix in the composite structure. Further, a composite structure comprising magnetic filler material embedded in a resin matrix obtainable by the method as disclosed in the current specification is disclosed. Still further, the use of the composite structure in applications requiring magnetic properties and resistance to mechanical fatigue is disclosed.

An interpenetrating network (IPN) polymer membrane material includes a soft polyurethane interspersed with a crosslinked conducting polymer. The material can be reversibly “switched” between its oxidized and reduced states by the application of a small voltage, ˜1 to 4 volts, thus modulating its diffusivity.