3.0-Polymer MW and Size.ppt

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  Chapter 2. Molecular Weight and Polymer Solutions POLYMER HEMISTRY 2.1 Number average and weight average molecular weight2.2 Polymer solutions2.3 Measurement of number average molecular weight2.4 Measurement of weight average molecular weight2.5 Viscometry2.6 Molecular weight distribution  2.1 Number Average and Weight Average Molecular Weight A. The molecular weight of polymers a. Some natural polymer (monodisperse) : All polymer molecules have same molecular weights. b. Synthetic polymers (polydisperse) : The molecular weights of polymers are distributedc. Mechanical properties are influenced by molecular weightmuch lower molecular weight ; poor mechanical property much higher molecular weight ; too tough to process optimum molecular weight ; 105 -106 for vinyl polymer 15,000 -20,000 for polar functional group containing polymer(polyamide) POLYMER HEMISTRY  Acclaim 與 ArcolPPG    B. Determination of molecular weight a.Absolute method : mass spectrometrycolligative propertyend group analysislight scatteringultracentrifugation. b. Relative method : solution viscosity c. Fractionation method : GPC POLYMER HEMISTRY
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