摘要： SEVERAL METHODS WERE CONDUCTED TO PREPARE CELLULOSE NANOFIBRILS FROM SOFT WOOD PULP BAMBOO PULP... SEVERAL METHODS WERE CONDUCTED TO PREPARE CELLULOSE NANOFIBRILS FROM SOFT WOOD PULP BAMBOO PULP.THE RESULTS SHOWED THAT HE MORPHOLOGY AND STRUCTURE AS WELL AS MECHANICAL PROPERTIES WERE CLOSELY DEPENDED ON THE PRETREATMENT AND DEFIBRILLATION PROCESS.DIMETHYLACETAMIDE (DMAC)/ LITHIUM CHLORIDE (LICL) PRETREATMENT WAS ADOPTED FOR THE PREPARATION OF CNFS, WHICH WAS PROVEN TO BE AN EFFECTIVE WAY TO REMARKABLY PROMOTE THE MECHANICAL NANOFIBRILLATION OF BAMBOO CELLULOSE FIBERS.THE UNIAXIALLY ALIGNED NANOFIBER NONWOVENS WITH HIGH PERFORMANCE WERE FABRICATED FROM MIXTURE OF THE COTTON CELLULOSE AND CELLULOSE NANOCRYSTAL BY ELECTROSPINNING PROCESS.显示全部
摘要： OWING TO THE SEVERE ENVIRONMENTAL AND ECOLOGICAL ISSUES ARISING FROM OIL SPILLS AND TOXIC CHEMI... OWING TO THE SEVERE ENVIRONMENTAL AND ECOLOGICAL ISSUES ARISING FROM OIL SPILLS AND TOXIC CHEMICAL LEAKAGE, THE SEPARATION OF OIL FROM WATER PRESENTS A WORLDWIDE CHALLENGE TO SAVE THE ENDANGERED ENVIRONMENT.A VERSATILE ABSORBENT WHICH CAN DEAL WITH DIFFERENT TYPES OF OIL CONTAMINANTS IS IN HIGH DEMANDED FOR THIS ISSUE.[1-4] IN THIS WORK, WE OBTAIN AN ULTRALIGHT,FIRE-RESISTANT, AND COMPRESSIBLE FOAM IN A LARGE SCALE BY DIRECTLY COMBUSTION TREATMENT USING COMMERCIALLY AVAILABLE POLY(MELAMINE FORMALDEHYDE) FOAMS AS PRECURSORS.THE OBTAINED FOAM NOT ONLY EFFECTIVELY SEPARATES OILS FROM WATER AS EXPECTED, BUT ALSO POSSESSES A VERY HIGH ABSORPTION CAPACITY FOR THE REMOVAL OF OILS FROM WATER UP TO 145 TIMES ITS OWN WEIGHT.MORE IMPORTANTLY, DUE TO ITS FIRE-RESISTANCE AND COMPRESSIBILITY, DISTILLATION, COMBUSTION AND SQUEEZING, OR A COMBINATION OF THESE CAN BE APPLIED FOR RECYCLING THE FOAMS DEPENDING ON THE TYPE OF POLLUTANTS, MAKING THEM VERSATILE AND COMPREHENSIVE ABSORBENTS TO SATISFY VARIOUS PRACTICAL SEPARATION REQUIREMENTS.显示全部
摘要： A PRESSURE VIBRATION INJECTION MOLDING MACHINE, IN WHICH A PERIODICAL SHEAR FIELD WAS IMPOSED O... A PRESSURE VIBRATION INJECTION MOLDING MACHINE, IN WHICH A PERIODICAL SHEAR FIELD WAS IMPOSED ON THE POLYMER MELT DURING THE FILLING AND PACKING STAGES, WAS SELF-DEVELOPED TO INVESTIGATE THE MORPHOLOGY EVOLUTION AND PROPERTY ENHANCEMENT OF ISOTACTIC POLYPROPYLENE.RESULTS SHOWED THAT TWO KINDS OF SHISH-KEBAB-LIKE CYLINDRULITES WERE ACHIEVED BETWEEN THE TRANSITION LAYER AND THE CORE LAYER FOR THE VIBRATION SAMPLES, AND THEIR MECHANICAL PERFORMANCE WAS GREATLY IMPROVED.显示全部
摘要： POLY (N-ISOPROPYLACRYLAMIDE) (PNIPAM)/CELLULOSE NANOFIBERS (CNFS) HYBRID AEROGELS WERE SUCCESSF... POLY (N-ISOPROPYLACRYLAMIDE) (PNIPAM)/CELLULOSE NANOFIBERS (CNFS) HYBRID AEROGELS WERE SUCCESSFULLY FABRICATED VIA A SIMPLE LYOPHILIZATION PROCESS FIOM CNFS AQUEOUS SUSPENSION CONTAINING PNIPAM.CNFS WERE EXTRACTED FROM FILTER PAPER CELLULOSE FIBERS USING 2,2,6,6-TETRAMETHYLPIPERIDINE-L-OXYL RADICAL (TEMPO)-MEDIATED OXIDATION FOLLOWED BY MECHANICAL NANOFIBRILLATION.PNIPAM WAS SYNTHESIZED THROUGH FREE RADICAL POLYMERIZATION.THE STRUCTURE AND PROPERTIES OF THE RESULTING AEROGELS WERE COMPREHENSIVELY ANALYZED USING INFRARED SPECTROSCOPY, SCANNING ELECTRON MICROSCOPY, TRANSMISSION ELECTRON MICROSCOPY, COMPRESSION TESTING AND CONTACT ANGLE (CA) MEASUREMENTS.DUE TO THE SYNERGISTIC EFFECTS FROM THE TWO COMPONENTS, THE HYBRID AEROGELS EXHIBITED ATTRACTIVE THERMO-RESPONSIVE PROPERTIES WITH EXCEPTIONALLY HIGH COMPRESSIVE STRENGTH.THE ULTIMATE COMPRESSION STRENGTH FOR THE AEROGEL (A4) AT 70% STRAIN REACHED 0.227 MPA, WHICH WAS APPROXIMATELY 15 TIMES HIGHER THAN THAT OF NEAT CNFS AEROGEL.THE CA MEASUREMENTS DEMONSTRATED THAT HYDROPHILICITY/HYDROPHOBICITY OF CNFS/PNIPAM HYBRID AEROGEL COULD BE SWITCHED AT A CERTAIN TEMPERATURE.THE CA SHARPLY INCREASED FROM 0 TO 97° WHEN WATER DROPLETS' TEMPERATURE WAS INCREASED FROM 20 TO 35 ℃, EXHIBITING STRONG THERMALLY RESPONSIVE BEHAVIORS.显示全部
摘要： IN THE PRESENT WORK, PRE-SHEAR WAS INTRODUCED INTO MELTING HDPE MELT BY A MODIFIED INJECTION MO... IN THE PRESENT WORK, PRE-SHEAR WAS INTRODUCED INTO MELTING HDPE MELT BY A MODIFIED INJECTION MOLDING MACHINE AND THEN SUCH PRE-SHEARED MELT WAS INJECTION MOLDED.THE HIERARCHICAL STRUCTURE AND CRYSTALLINE MORPHOLOGY OF HDPE PART WAS INVESTIGATED BY USING WAXD AND SEM.IT WAS FOUND THAT PRE-SHEAR CAN ENHANCE THE FORMATION OF ORIENTED LAMELLAE IN CORE REGION OF HDPE PART.MORE INTERESTINGLY, SUCH ENHANCING EFFECT BECOMES MORE REMARKABLE WHEN PRE-SHEAR WAS EXERTED AT A RELATIVELY LOW TEMPERATURE AND MECHANICAL PROPERTY WAS PROMOTED SIGNIFICANTLY.显示全部
摘要： BAMBOO FIBER REINFORCED POLYPROPYLENE (PP)/POLYLACTIDE (PLA) COMPOSITES WERE FABRICATED BY MELT... BAMBOO FIBER REINFORCED POLYPROPYLENE (PP)/POLYLACTIDE (PLA) COMPOSITES WERE FABRICATED BY MELT BLENDING EXTRUSION AND INJECTION MOULDING, AND MECHANICAL PROPERTIES, THERMOSTABILITY AND MORPHOLOGY OF THE COMPOSITES WERE EVALUATED.THE RESULT SHOWED THAT AS THE CONTENT OF BAMBOO FIBER WAS 20%, THE TENSILE STRENGTH AND BENDING STRENGTH INCREASED BY 8.67% AND 20.4%, RESPECTIVELY, COMPARED WITH THE COMPOSITE WITHOUT BAMBOO FIBER.BUT THE ELONGATION AT BREAK AND THE IMPACT STRENGTH DECREASED WITH THE INCREASE OF BAMBOO FIBER CONTENT.BAMBOO FIBER HAD A LITTLE EFFECT ON THE THERMAL STABILITY OF THE COMPOSITES.显示全部
摘要： HYDROPHILIC GIGAPOROUS POLYSTYRENE MICROSPHERES WERE FABRICATED BY SURFACE GRAFTING POLYMERIZAT... HYDROPHILIC GIGAPOROUS POLYSTYRENE MICROSPHERES WERE FABRICATED BY SURFACE GRAFTING POLYMERIZATION OF METHACRYLOXYETHYLTRIMETHYL AMMONIUM CHLORIDE (DMC) USING ATOM TRANSFER RADICAL POLYMERIZATION (ATRP).IN THIS METHOD, GRAFTING AMOUNT OF PDMC WAS CONTROLLED THROUGH REACTION TIME AND THE TOTAL POLYMERIZATION TIME WAS OPTIMIZED FOR 2 H.THE MODIFIED MICROSPHERES COULD EXHIBIT A PROTEINS RECOVERY OF OVER 90%.THE MORPHOLOGY OF THE MODIFIED MICROSPHERES WAS OBSERVED BY THE SCANNING ELECTRONIC MICROSCOPE (SEM), AND SEM IMAGES INDICATED THE THROUGHPUT PORES IN THE GIGAPOROUS POLYSTYRENE WAS NOT BLOCKED BY THE GRAFTING POLYMERS.THE DYNAMIC BINDING CAPACITY OF PROTEINS ON THE MODIFIED MICROSPHERES WAS MEASURED IN VARIOUS FLOW RATES, AND THE RESULTS INDICATED THAT DBC WAS NOT OBVIOUS CHANGED AT THE RANGE OF 23-19 MG/ML WHEN THE FLOW RATES CHANGED FROM 360 CM/H TO 1800 CM/H.THE MODIFIED GIGAPOROUS MICROSPHERES WITH GOOD PERMEABILITY SHOWED GREAT POTENTIAL IN THE RAPID SEPARATION OF PROTEINS.显示全部
