摘要：IN THIS ARTICLE,ETHYL PHENYLACETATE(EPA)/ISOPHORONE DIISOCYANATE(IPDI) LOADED NANOCOMPOSITE MICROCA...IN THIS ARTICLE,ETHYL PHENYLACETATE(EPA)/ISOPHORONE DIISOCYANATE(IPDI) LOADED NANOCOMPOSITE MICROCAPSULES WERE PREPARED.THIS MODIFIED ENCAPSULATION PROCEDURE UTILIZED THE INTERRACIAL POLYMERIZATION BETWEEN IPDI AND DIETHYLENETRIAMINE(DETA) TEMPLATED PICKERING DROPLETS STABILIZED BY SIO2 NANOPARTICLES.SIZES OF EPA/IPDI MICROCAPSULES COULD BE CONTROLLED BY ADJUSTING THE OIL CONTENT OF PICKERING EMULSION.AND SIZES OF CAPSULES EXHIBITED A WIDE RANGE DISTRIBUTION.FROM THERMAL GRAVIMETRIC ANALYSIS (TGA),CORE MATERIAL FILL CONTENT WAS ESTIMATED AT 53 WT %.SCANNING ELECTRON MICROSCOPY (SEM) DETERMINATION INDICATED THAT THE CAPSULES HAD ROBUST AND COMPACT WALL,WITH A UNIFORM THICKNESS OF CA.2 μM.THE EMULSIONS STABILIZED BY PARTICLES ARE CALLED PICKERING EMULSIONS.THE THCHNOLOGY BASED ON PICKERING EMULSION TEMPLATE IS POWERFUL TOOL TO PREPARE ORGANIC/INORGANIC HYBRID MIEROPARTICLES WITH A CORE-SHELL STRUCTURE,WHICH HAS A SIGNIFICANT POTENTIAL APPLICATION IN THE FABRICATION FOR MATERIALS WITH A MOCRO-/NANOMETER STRUCTURE.显示全部
摘要：IN THIS PAPER,A SERIES OF FLUORINATED BIS(PHENOXYIMINE) TITANIUM CATALYSTS FOR OLEFIN LIVING COORDI...IN THIS PAPER,A SERIES OF FLUORINATED BIS(PHENOXYIMINE) TITANIUM CATALYSTS FOR OLEFIN LIVING COORDINATION POLYMERIZATION WERE DESIGNED AND SYNTHESIZED BASED ON ADJUSTING STERIC EFFECTS AND ELECTRONIC EFFECTS OF LIGANDS.THE MECHANISM AND KINETICS OF OLEFIN LIVING / CONTROLLED COORDINATION POLYMERIZATION AND ITS SELECTIVE CHAIN TRANSFER REACTION WERE INVESTIGATED AND CLARIFIED.THE LINEAR POLYETHYLENE,ISOTACTIC AND SYNDIOTACTIC POLYPROPYLENE WITH REACTIVE END-GROUPS USED AS POLYOLEFINE MACROMOLECULAR INITIATORS AND THE PRECURSORS OF CLICK COUPLING REACTION WERE HIGH EFFICIENTLY PREPARED.THE CRYSTALLINE POLYOLEFIN-BASED BLOCK COPOLYMERS WERE SYNTHESIZED BY LIVING FREE RADICAL POLYMERIZATION AND LIVING RING-OPENING POLYMERIZATION WITH POLYOLEFINE MACROMOLECULAR INITIATORS,AND CLICK COUPLING REACTION.THE RESULTANT BLOCK COPOLYMERS COULD SELF-ASSEMBLES INTO SPHERICAL MICELLES COMPOSED OF A MOLTEN POLYOLEFIN CORE IN DMF AT 150 ℃,THAT IS ABOVE THE MELTING TEMPERATURE (TM) OF THE POLYOLEFIN BLOCK.AS THE TEMPERATURE DECREASED,THE MORPHOLOGY CHANGED FROM SPHERICAL TO PLATELET-LIKE MICELLE WITH CRYSTALLIZED POLYOLEFIN CORE.FURTHERMORE,THE CONFINED CRYSTALLIZATION OF POLYOLEFIN BLOCK IN NANOSIZED SELF-ASSEMBLED MICELLE CORE WAS INVESTIGATED BY DIFFERENTIAL SCANNING CALORIMETRY (DSC) AND WIDE-ANGLE X-RAY DIFFRACTION (WAXRD).WE OBSERVED AN ENORMOUS SUPERCOOLING DURING CRYSTALLIZATION OF POLYOLEFIN BLOCK RESULTING FROM THE HOMOGENEOUS NUCLEATION AND A LOWER TM THAN THAT OF BULK POLYOLEFIN-BASED BLOCK COPOLYMERS.显示全部
摘要：TWO KINDS OF AROMATIC MACROCYCLIC ESTER DIMERS HAVE BEEN SYNTHESIZED FROM O-PHTHALOYL DICHLORIDE AN...TWO KINDS OF AROMATIC MACROCYCLIC ESTER DIMERS HAVE BEEN SYNTHESIZED FROM O-PHTHALOYL DICHLORIDE AND 4,4(')-(HEXAFLUOROISOPROPYLIDENE) DIPHENOL OR BPA VIA INTERRACIAL POLYCONDENSATION REACTION UNDER PSEUDO-HIGH DILUTION CONDITIONS.THE FACILE RING OPENING COPOLYMERIZATION OF CPA AND 6FCPA WAS ACHIEVED TO GIVE LINEAR HIGH MOLECULAR WEIGHT COPOLYESTER.THE TGS OF HOMOPOLYMERS AND COPOLYMER ARE IN ACCORD WITH THE FOX EQUATION.THE RESULTS OF DSC AND NMR ANALYSES SUGGEST THAT THE COPOLYMER IS RANDOM.THE 5% WEIGHT LOSS TEMPERATURES OF HOMOPOLYMERS AND COPOLYMER ARE ALL HIGHER THAN 370 ℃,WHICH INDICATE THAT THE PRODUCTS OBTAINED BY ROP WERE THERMALLY STABLE.THE ISOTHERMAL CHEMORHEOLOGY OF THE ROP OF CYCLIC ESTER DIMER IS ALSO INVESTIGATED.THE RESULTS SHOW THAT THE SHEAR VISCOSITY OF THE MOLTEN REACTIVE MIXTURE INCREASES SLOWLY AND IS LOWER THAN 10 PA·S AT A CONSTANT SHEAR RATE OF 0.05 S-1 IN THE INITIAL STAGE OF RING-OPENING POLYMERIZATION AND THE VISCOSITY INCREASES DRAMATICALLY AFTER THE INITIAL STAGE.显示全部
摘要：IN THIS STUDY,ESTER-AMIDE EXCHANGE REACTION AND CHAIN EXTENSION REACTION BETWEEN POLY(BUTYLENE SUCC...IN THIS STUDY,ESTER-AMIDE EXCHANGE REACTION AND CHAIN EXTENSION REACTION BETWEEN POLY(BUTYLENE SUCCINATE) (PBS) AND POLY(HEXAMETHYLENE (ISO-CO-TERE) PHTHALAMIDE) (PA6ICOT) WERE CARRIED OUT UNDER MELTING CONDITIONS IN A LIST HORIZONTAL REACTOR AND TWIN-SCREW EXTRUDER,RESPECTIVELY.SUPERCRITICAL CARBON DIOXIDE (SCCO2) WAS INTRODUCED DURING THE REACTION PROCESS.THE RESULTS SHOW THAT RANDOM AND BLOCKY ALIPHATIC ESTERS-SEMIAROMATIC AMIDE COPOLYMERS WITH HIGH MOLECULAR WEIGHT CAN BE OBTAINED WITH SUITABLE CATALYST OR CHAIN EXTENDER.USING SCCO2 CAN EFFECTIVELY ENHANCE THE REACTIONS.CHARACTERIZATIONS,SUCH AS CHAIN END CARBOXYL CONCENTRATION,SOLUBILITY PROPERTIES,INFRARED SPECTRA,NMR SPECTRA,WERE UTILIZED TO REVEAL THE REACTION MECHANISM PATHWAY AND MICROSTRUCTURE OF PRODUCT OBTAINED UNDER VARIOUS CONDITIONS.THE EFFECTS OF REACTION ON THE PHASE MORPHOLOGY WERE STUDIED BY SCANNING ELECTRON MICROSCOPY.SYSTEMATIC INVESTIGATION ON CRYSTALLIZATION KINETICS,CRYSTAL MORPHOLOGY AND STRUCTURE OF THE REACTION PRODUCTS WERE CONDUCTED.THE RELATIONSHIP BETWEEN THE MICROSTRUCTURE,PHASE MORPHOLOGY AND THERMAL PROPERTIES,MECHANICAL PROPERTIES AND DEGRADATION PROPERTIES WERE REVEALED.FOUR KINDS OF THERMODYNAMIC MODELS WERE USED TO PREDICT THE SOLUBILITY OF SUPERCRITICAL FLUIDS IN POLYMER,PROVIDING INFORMATION OF THE AMOUNT OF SCCO2 USED IN THE REACTION PROCESS.THIS WORK SHOWS THAT,SCCO2 ASSISTED CHAIN EXTENSION REACTION BETWEEN IS THE PREFERRED WAY TO PREPARE ALIPHATIC ESTERS-SEMIAROMATIC AMIDE COPOLYMER WITH HIGH MOLECULAR WEIGHT.THE PRODUCT POSSES BETTER THERMAL PROPERTIES,MECHANICAL PROPERTIES AND DEGRADATION PERFORMANCE THAN PBS.显示全部
