摘要:
A hierarchical catalyst composition comprising a continuous or particulate macroporous scaffold in which is incorporated mesoporous aggregates of magnetic nanoparticles, wherein an enzyme is embedded in mesopores of the mesoporous aggregates of magnetic nanoparticles. Methods for synthesizing the hierarchical catalyst composition are also described. Also described are processes that use the recoverable hierarchical catalyst composition for depolymerizing lignin, remediation of water contaminated with aromatic substances, polymerizing monomers by a free-radical mechanism, epoxidation of alkenes, halogenation of phenols, inhibiting growth and function of microorganisms in a solution, and carbon dioxide conversion to methanol. Further described are methods for increasing the space time yield and/or total turnover number of a liquid-phase chemical reaction that includes magnetic particles to facilitate the chemical reaction, the method comprising subjecting the chemical reaction to a plurality of magnetic fields of selected magnetic strength, relative position in the chemical reaction, and relative motion.
摘要:
A hierarchical catalyst composition comprising a continuous or particulate macroporous scaffold in which is incorporated mesoporous aggregates of magnetic nanoparticles, wherein an enzyme is embedded in mesopores of the mesoporous aggregates of magnetic nanoparticles. Methods for synthesizing the hierarchical catalyst composition are also described. Also described are processes that use the recoverable hierarchical catalyst composition for depolymerizing lignin, remediation of water contaminated with aromatic substances, polymerizing monomers by a free-radical mechanism, epoxidation of alkenes, halogenation of phenols, inhibiting growth and function of microorganisms in a solution, and carbon dioxide conversion to methanol. Further described are methods for increasing the space time yield and/or total turnover number of a liquid-phase chemical reaction that includes magnetic particles to facilitate the chemical reaction, the method comprising subjecting the chemical reaction to a plurality of magnetic fields of selected magnetic strength, relative position in the chemical reaction, and relative motion.
摘要:
Elastomeric polymers and compounded elastomers having reduced amounts of leachables and improved resistance to γ-irradiation sterilization suitable for pharmaceutical stopper and seal applications. These polymers and compounded elastomers maintain their physical performances upon being exposed to γ-irradiation over time and typical use conditions. The polymer is prepared by reacting a mixture of i) a C4 to C7 isoolefin monomer, ii) a styrene based monomer, and optionally iii) a C4 to C14 multiolefin monomer wherein the polymer contains 5 to 15 wt % of styrene derived units.
摘要:
A process for the polymerization of vinyl halides and/or vinylidene halides which comprising contacting the vinyl halide and/or vinylidene halide in gaseous form with a catalyst composition comprising(a) at least one compound of a transition metal of Groups IVA to VIA of the Periodic Table of the Elements, as hereinbefore defined, and(b) at least one compound having the structure ##STR1## WHERE M is aluminum or zinc, n and m each is an integer not greater than one less than the valency of M, at least one of the groups R is a hydrocarbon group, R.sup.1 is hydrogen or a hydrocarbon group, and X is hydrogen or a monovalent organic group.
摘要:
Modified vinyl chloride polymers, having elevated heat deflection temperatures, are provided by the post-chlorination of vinyl chloride-propylene copolymers.
摘要:
A METHOD FOR CROSSLINKING A CHLORINE-CONTAINING POLYMER BY BRINING IN CONTACT A CHLORINE-CONTAINING POLYMER HAVING CARBON-CHLORINE BONDS WITH A SALT OF POLYVALENT INORGANIC OR ORGANIC ACID IN THE PRESENCE OF A SALT OF HYDROCARBYL SATURATED ONIUM, OR ALTERNATIVELY BY BRINGING THE POLYMER IN CONTACT WITH A HYDROCARBYL SATURATED ONIUM SALT OF POLYVALENT INORGANIC ACID.
摘要:
PARTICLES OF POLY(VINYL CHLORIDE) HOMOPOLYMERS HAVING INCREASED POROSITY ARE OBTAINED BY FREEZE-DRYING SUSPENSION OR BULK POLYMERIZED POLY(VINYL CHLORIDE) HOMOPOLYMER PARTICLES THUS MINIMIZING SIGNIFICANT HEAT HISTORY DURING PARTICLE FORMATION.