[article]
| Titre : |
An overview of size exclusion chromatography applied to polymers and coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Theodore Provder, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 46-59 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Chromatographie sur gel
Oligomères
Poids moléculaires
Polymères
Revêtements organiques
Viscosimétrie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The coatings technologies of waterborne, high solids, powder, and radiation curable coatings generally require high-molecular-weight latex polymers or strategically designed low-molecular-weight polymers, oligomers, and reactive additives. The design of these resin materials requires molecular weight distribution (MWD) information in the very high and very low-molecular-weight ranges which are accessible by size-exclusion chromatography (SEC). In addition, there is a need for compositional distribution information as a function of molecular weight, particularly for oligomers; absolute MWD information, particularly for water-soluble polymers ; and chain-branching information for high-molecular-weight polymers.
This overview discusses the SEC separation mechanism, molecular weight calibration methods including the use of hydrodynamic volume, data treatment methods, and polymer chain-branching determination. The use of molecular size sensitive detectors (viscometer, light scattering) and compositional sensitive detectors (UV-visible, IR) are discussed in the context of illustrative qualitative and quantitative examples. The practice of high-resolution SEC analysis of oligomers is discussed and illustrated with problem-solving examples. |
| Note de contenu : |
- SEC SEPARATION MECHANISM : Instrumentation - Calibration - instrument spreading correction - Multiple detectors
- SEC/DRI/UV/IR : Quantitative compositional molecular-weight distribution considerations
- SEC/LALLS/MALS : - SEC/viscometer - Oligomer applications
- FUTURE TRENDS AND NEEDS
- Fig. 1 : Dependence of molecular size in solution upon retention volume
- Fig. 2 : Schematic procedures for obtaining the secondary molecular weight calibration curve from on-line SEC/viscometer data
- Fig. 3 : SEC/DRI/ IR/UV chromatogram for a copolymer of methyl methacrylate (MMA) and vinyl acetate (VA) (25/75)
- Fig. 4 : SEC/UV/IR chromatogram of a blend of a styrene/acrylic/acid terpolymer resin and a melamine resin
- Fig. 5 : SEC/UV and SEC/IR chromatogram of poly(methyl methacrylate) (PMMA) samples
- Fig. 6 : Contour plot of a Glycidal Methacrylate (GMA) acrylic copolymer
- Fig. 7 : Spectrum index plot of an acrylic copolymer
- Fig. 8 : Photodiode array detection (PAD) estimate of the styrene content of a styrene acrylonitrile (SAN) copolymer
- Fig. 9 : SEC/MALS responses from DRI and MALS detectors for a three component polystyrene mixture
- Fig. 10 : Variations of scattering intensities with angular position and retention volume
- Fig. 11 : HPGPC DRI/VISC detector responses versus retention volume
- Fig. 12 : Log [η] versus log Mw plots for two randomly branched polyvinyl acetate samples
- Fig. 13 : HPSEC chromatograms of two high solids polyester resin samples
- Fig. 14 : Chromatograms of three isocyanate crosslinkers |
| En ligne : |
https://drive.google.com/file/d/1ppM8QnRv82tUnFIhdRGwbX8o_i_9CUf2/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35699 |
in COATINGS TECH > Vol. 18, N° 4 (04/2021) . - p. 46-59
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Contribution à l'étude viscométrique en solutions diluées de collagène acido-soluble d'origine bovine / 1987
