摘要:
High levels of inorganic filler, processing fluid and silicone polymer are compounded and devolatilized into homogeneous filled compositions with requisite reinforcing properties and levels of volatiles. In the method, a filler, processing fluid and silicone polymer are mixed in a first compounding apparatus (12,44,76) to produce a dispersed composition containing volatiles. The dispersed composition is then compounded in a long extruder (14,46,78) having an L/D ratio of greater than 50 to devolatilize the dispersed composition.
摘要:
Conductive polyphenylene ether-polyamide compositions having excellent ductility are prepared by melt blending polyphenylene ether, an unsaturated impact modifying polymer and a functionalizing compound in an initial step, optionally in combination with a portion of the polyamide, and subsequently melt blending with the remainder of the polyamide and conductive carbon black having a low volatiles content. A mixture of polyamides, illustrated by mixtures of polyamide-6 and polyamide-66, is employed.
摘要:
Disclosed herein is a method of making a polymer composition comprising blending a polymeric material precursor with nanoparticles, wherein each nanoparticle comprises a substrate and a coating composition disposed on the substrate; and polymerizing the polymeric material precursor to form a polymeric material, wherein the nanoparticles are dispersed within the polymeric material to form a polymer composition.
摘要:
Disclosed herein is a method of making a polymer composition comprising blending a polymeric material precursor with nanoparticles, wherein each nanoparticle comprises a substrate and a coating composition disposed on the substrate; and polymerizing the polymeric material precursor to form a polymeric material, wherein the nanoparticles are dispersed within the polymeric material to form a polymer composition.
摘要:
A method for manufacturing an ultra-thin polymeric film is disclosed. The method includes the steps of melt blending of a polymeric composition or a nanocomposite composition in an extruder. Next, the molten composition is conveyed through a flat die with a small die lip gap. A melt pump may also be used to provide a constant, non-pulsating flow of the melted composition through the die. The melted composition may be passed through a filtration device to remove contaminants that could adversely affect the dielectric performance of the film. Next, the film is stretched by passing the film through take-up rollers at relatively high take-up speeds. Then, the composition is cooled to form a film or sheet. The edges of the film may be trimmed, and the film wound up on a roll using a tension-controlled winding mechanism. A heated roll may be used to temper/anneal the film, thereby eliminating frozen-in internal stresses.
摘要:
Polyphenylene ether-polyamide compositions (also containing an impact modifying polymer) having improved physical and rheological properties are prepared by incorporating therein at least one non-polymeric functionalizing compound such as citric acid and a minor proportion of at least one polyepoxy compound having an epoxy equivalent weight of at most about 4,000, preferably an epoxidized novolak, or at least one poly(ortho ester).
摘要:
A method for manufacturing an ultra-thin polymeric film is disclosed. The method includes the steps of melt blending of a polymeric composition or a nanocomposite composition in an extruder. Next, the molten composition is conveyed through a flat die with a small die lip gap. A melt pump may also be used to provide a constant, non-pulsating flow of the melted composition through the die. The melted composition may be passed through a filtration device to remove contaminants that could adversely affect the dielectric performance of the film. Next, the film is stretched by passing the film through take-up rollers at relatively high take-up speeds. Then, the composition is cooled to form a film or sheet. The edges of the film may be trimmed, and the film wound up on a roll using a tension-controlled winding mechanism. A heated roll may be used to temper/anneal the film, thereby eliminating frozen-in internal stresses.
摘要:
A method of separating a polymer-solvent mixture is described wherein a polymer-solvent mixture is heated prior to its introduction into an extruder comprising an upstream vent and/or a side feeder vent to allow flash evaporation of the solvent, and downstream vents for removal of remaining solvent. The one-step method is highly efficient having very high throughput rates while at the same time providing a polymer product containing low levels of residual solvent.
摘要:
Polyphenylene ether-polyamide compositions (also containing an impact modifying polymer) having improved physical and rheological properties are prepared by incorporating therein at least one non-polymeric functionalizing compound such as citric acid and a minor proportion of at least one polyepoxy compound having an epoxy equivalent weight of at most about 4,000, preferably an epoxidized novolak, or at least one poly(ortho ester).