高分子材料研究方法凝胶色谱法.ppt
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1、Chap 6 Gel Chromatography,6.1 Background6.2 Principles of Gel Chromatography6.3 Data Treatment6.4 Applications on Polymers6.5 Field-Flow Fraction(FFF)Technique,GPC18601930:porous materials have adsorption-separation function(especially for dye)19401970:appearance of Liquid Chromatography 1964:The fi
2、rst GPC produced by Waters company1970:HPLC(rapid test、good separation effects、less sample、more sensitive);New technology of HPLC applied in GPC area,6.1 Background,6.1 Background,Significance of Molecular Weight Distribution(MWD)Statistic Average Molecular WeightExpressions of MWDMeasurement of MWD
3、,Relation between molecular weight and properties of polymer,6.1.2 Statistic Average Molecular Weight,Number-average Molecular WeightWeight-average Molecular Weight,6.1.2 Statistic Average Molecular Weight,Z-average Molecular WeightViscosity-average Molecular Weight,6.1.3 Expressions of MWD,Paramete
4、rsBreadth parameter of molecular weight distribution:variance and standard deviation between different molecular weights and the average molecular weightPolydispersity index of molecular weight:,6.1.3 Expressions of MWD,Graphic MethodsDiscrete distribution curvesContinual distribution curves,6.1.4 M
5、easurement of MWD,TheoriesReactions:terminal analysisThermodynamics of dilute solutions:colligative properties(boiling point elevation,freezing point depression,osmotic pressure)Kinetics:ultracentrifugal sedimentation,viscosity,volume exclusionOptical properties:scattering,6.1.4 Measurement of MWD,6
6、.2 Principles of Gel Chromatography,High Performance Liquid Chromatography(HPLC)Gel ChromatographySeparation Mechanisms,6.2.1 HPLC,Definition High Performance Liquid ChromatographyAlso called high pressure liquid chromatographySmall particles of stationary phase:10 mHigh pressure injection pumpsAuto
7、matic detectors,6.2.1 HPLC,ClassificationAdsorption chromatographyStationary phase:absorbentsAdsorption of mobile phaseGradient elutionApplications:additives in polymers,6.2.1 HPLC,ClassificationDistribution chromatographyLiquid-liquid chromatographyNormal phase LLC/Reverse phase LLC:polarityBonded
8、stationary phase,6.2.1 HPLC,ClassificationIon-exchange chromatographyStationary phase:ion-exchange resinApplications:amino acids,proteins,6.2.1 HPLC,ClassificationGel chromatographyStationary phase:porous gel-like packingsLarge molecules retention value/small molecules retention value Also called“ge
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- 高分子材料 研究 方法 凝胶 色谱
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