PHÂN TÍCH POLYME ( POLYME ANALYSIS )

Is a branch of polymer science dealing with analysis and characterisation of polymers. üThe complication of macromolecular chains, the dispersion in molecular weight, tacticity, crystallinity, orientation, composition of polymers etc. and complex morphological systems ⇒ analysis of polymer ≠ the small organic materials ⇒ Focus on viscoelastic properties, dynamic mechanical testing. Methods of polymer analysis Chemical, Molecular and Structural Characterisation -Molecular weight determination, -Microstructural characterisation and compositional analysis, -Crystallinity, -Investigation of polymer morphology, particle size, -Contact angle and wettability measurements Instruments FT-IR IR-microscope GPC ( size exclusion chromatography SEC) -Viscosimetry -X-ray (WAXS and SAXS) -EM, SEM, TEM, AFM -Dynamic and static methods...
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PHÂN TÍCH POLYME ( POLYME ANALYSIS ) TRƯỜNG ĐẠI HỌC BÁCH KHOA ĐÀ NẴNG KHOA HOÁ ♣♣♣ PHÂN TÍCH POLYME (POLYMER ANALYSIS) TS. Đoàn Thị Thu Loan Polymer analysis üIs a branch of polymer science dealing with analysis and characterisation of polymers. üThe complication of macromolecular chains, the dispersion in molecular weight, tacticity, crystallinity, orientation, composition of polymers etc. and complex morphological systems ⇒ analysis of polymer ≠ the small organic materials ⇒ Focus on viscoelastic properties, dynamic mechanical testing. Methods of polymer analysis Chemical, Molecular and Structural Surface Mechanical and Physical Characterisation Characterisation Properties -Molecular weight determination, -Surface roughness, -Tensile, flexural, impact, -Microstructural characterisation and -Chemical compression, hardness tests, compositional analysis, composition, -Rheological and viscoelastic -Crystallinity, -Interface properties, stiffness and -Investigation of polymer morphology, modulus, surface tension, characetrisation particle size, permeation and diffusion in -Contact angle and wettability polymers, adhesion tests, measurements density Instruments -AFM, SEM FT-IR Instron mechanical tester • • • IR-microscope -FT-IR Vicker hardness tester • • • GPC ( size exclusion chromatography -Pull-out test DMA • • • SEC) Melt flow indexer • -Viscosimetry Torsions Rheometer • • -X-ray (WAXS and SAXS) • • -EM, SEM, TEM, AFM • -Dynamic and static methods for contact • angle measurements. Methods of polymer analysis Electrical and Optical Thermal Behaviour Miscellaneous (hon tap) Properties Conductivity, electric -Melting point, glass transition Purity and molecular current in solution, temperature, free rotation temperature, weight of small light emitting and -Degradation and stability behaviour of molecules, water content electromagnetic polymers in organic solvents, surface tension properties measurement, pH Instruments Inolab conductivity GC Thermogravimetric analyser (TGA) • • meter pH meter TGA-FTIR coupled technique • HPLC • • • Differential scanning calorimetry (DSC) Karl-Fischer titration • • Modulated differential scanning • calorimetry (ADSC) Dynamic thermomechanical analyser • (DMTA) Dielectric relaxation • Purpose of polymer analysis -For quality control -For predicting service performance -To generate design data -To investigate failures Essential to identify the purpose of testing, because the requirements for each of the purposes are different. -Complexity -Precision Balance of these attributes, -Automated test -Reproducibility according to the purpose of -Nondestructive test -Rapidity the test -Cost Quality Control Tests üNondestructive methods are advantageous and indeed essential when 100% of the output is being tested. üThe tests should be simple and inexpensive, and automation will probably aid the rapidity of testing. üTests related to product performance are preferred. Tests Predicting Product Performance üThe most important factor is that the tests relate to service conditions and to aspects of product performance. üshould not be too complex, although rapidity and cheapness are less important than was the case with quality control. üNondestructive tests are not always appropriate when ...