摘要:
A method for producing polyamide particles may include: mixing a mixture comprising a polyamide, a carrier fluid that is immiscible with the polyamide, and nanoparticles at a temperature greater than a melting point or softening temperature of the polyamide and at a shear rate sufficiently high to disperse the polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the polyamide to form solidified particles comprising polyamide particles having a circularity of 0.90 or greater and that comprise the polyamide and the nanoparticles associated with an outer surface of the polyamide particles; and separating the solidified particles from the carrier fluid.
摘要:
Pigmented polymer particles may comprise a thermoplastic polymer and a pigment, wherein at least some of the pigmented polymer particles have a morphology according to (a), (b), (c), or any combination thereof: (a) the pigment having a coating comprising the thermoplastic polymer and the coated pigment adhered to a thermoplastic polymer particle, (b) the pigment being embedded in an outer surface of the thermoplastic polymer particle, and (c) the pigment being encapsulated by the thermoplastic polymer particle. The pigmented polymer particles, especially the highly spherical pigmented polymer particles, may be useful, among other things, as starting material for additive manufacturing. For example, a method may comprise: depositing, upon a surface, the foregoing pigmented polymer particles optionally in combination with other thermoplastic polymer particles; and once deposited, heating at least a portion of the particles to promote consolidation thereof and form a consolidated body.
摘要:
A method of making a pure block copolymer includes forming a crude block copolymer; heating a solution of the crude block copolymer and alcohol; and cooling the solution to promote precipitation of a purified block copolymer, wherein an amount of impurities remaining in the purified block copolymer is from about 0 to about 5 wt % based on a total weight of the purified block copolymer; a ratio of a polydispersity index of the crude block copolymer to a polydispersity index of the purified block copolymer is from about 1.02 to about 1.25; a ratio of a molecular weight of the crude block copolymer to a molecular weight of the purified block copolymer is from about 0.75 to about 1.0; and a ratio of a number average molecular weight of the crude block copolymer to a number average molecular weight of the purified block copolymer is from about 0.65 to about 1.
摘要:
A method for producing polyimide microparticles may comprise: combining a diamine and a dianhydride in a first dry, high boiling point solvent; reacting the diamine and the dianhydride to produce a mixture comprising poly(amic acid) (PAA) and the first dry, high boiling point solvent; emulsifying the mixture in a matrix fluid that is immiscible with the first dry, high boiling point solvent using an emulsion stabilizer to form a precursor emulsion that is an oil-in-oil emulsion; and heating the precursor emulsion during and/or after formation to a temperature sufficient to polymerize the PAA to form the polyimide microparticles.
摘要:
A method for preparing a latex resin includes initiating polymerization of a starting reaction mixture including a first surfactant, a second surfactant, a solvent, a core monomer, and a hydrophobic monomer to form a latex seed in a reaction vessel, and mixing an additional amount of the second surfactant, the core monomer, and the hydrophobic monomer into the reaction vessel to form an emulsion including latex particles, wherein the first surfactant and the second surfactant may be the same or different.
摘要:
A method of forming a pre-cure solution for a structured organic film (SOF) is described, including contacting at least one type of segment and at least one type of pre-linker with a bio-based solvent. The method also includes dissolving the at least one type of segment and the at least one type of pre-linker within the bio-based solvent. The method also includes where the bio-based solvent has a viscosity above 0.92 MPa-s. A composition including a bio-based solvent is also disclosed.
摘要:
High spherical particles for use in piezoelectric applications may be produced mixing a mixture comprising a graphene oxide-polyvinylidene fluoride (GO-PVDF) composite, a carrier fluid that is immiscible with the PVDF, and optionally an emulsion stabilizer at a temperature equal to or greater than a melting point or softening temperature of the PVDF to disperse the GO-PVDF composite in the carrier fluid, wherein the GO-PVDF composite has a transmission FTIR minimum transmittance ratio of β-phase PVDF to α-phase PVDF of about 1 or less; cooling the mixture to below the melting point or softening temperature of the PVDF to form GO-PVDF particles; and separating the GO-PVDF particles from the carrier fluid, wherein the GO-PVDF particles comprise the graphene oxide dispersed in the PVDF, and wherein the GO-PVDF particles have a transmission FTIR minimum transmittance ratio of β-phase PVDF to α-phase PVDF of about 1 or less.
摘要:
A structured organic film (SOF) is disclosed. The structured organic film also includes a plurality of segments, a plurality of linkers, and a plurality of ionic capping segments, where at least one or more of the ionic capping segments may include a piperidinium group. Implementations of the structured organic film (SOF) may include where the piperidinium group is a bicyclic piperidinium group. The piperidinium group can be an n-cyclic quaternary ammonium. A total concentration of ionic segments in the SOF is from about 0.1 to about 5.0 molar equivalents based on a total concentration of segments in the SOF. The piperidinium group can be 3-methanol-6-azoniaspiro[5.5]undecane (MeASU). The structured organic film (SOF) has an ion exchange capacity (IEC) of from about 0.25 meq/g to about 5.00 meq/g. An ion-exchange membrane may include the structured organic film (SOF).
摘要:
Optical absorber-containing thermoplastic polymer particles (OACTP particles) may be produced by methods that comprise: mixing a mixture comprising a thermoplastic polymer, a carrier fluid that is immiscible with the thermoplastic polymer, and optionally an emulsion stabilizer at a temperature greater than a melting point or softening temperature of the thermoplastic polymer and at a shear rate sufficiently high to disperse the thermoplastic polymer in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the thermoplastic polymer to form solidified particles comprising the thermoplastic polymer; separating the solidified particles from the carrier fluid; and exposing the solidified particles to an optical absorber to produce the OACTP particles.
摘要:
Polymer coated particulates may be produced by melt emulsification methods, for example, by mixing a mixture comprising: a carrier fluid, particulates, a thermoplastic polymer, and optionally an emulsion stabilizer at a temperature at or greater than a melting point or softening temperature of the thermoplastic polymer, wherein a mass ratio of the particulates to the thermoplastic polymer is about 1:0.1 to about 1:5; cooling the mixture to below the melting point or softening temperature to form polymer coated particulates; and separating the polymer coated particulates from the carrier fluid.