THF affords greater precision and accuracy than H 2O in VPO measurements, and was found to be a suitable solvent for the determination of molecular weight of aquatic fulvic acid because it obviates the dissociation problem. An inverse correlation was observed with these samples between the ...
ASTM D5296 Standard Test Method for Molecular Weight Averages and Molecular Weight Distribution of Polystyrene by High Performance Size-Exclusion ChromatographyISO 13885-1 Binders for Paints and Varnishes -- Gel Permeation Chromatography (GPC) -- Part 1: Tetrahydrofuran (THF) as Eluent...
GPC for the analysis of hydrophobic polymers has traditionally been conducted using a differential refractive index detector (RID) because many synthetic polymer compounds don’t have the functional groups for UV absorbance and the solvent for GPC mobile phase such as tetrahydrofuran (THF) and N,N-...
Polystyrene Standards (7) (KF-807L) Polystyrene Standards (21) (GF-HQ : THF, Chloroform and DMF) Polystyrene Standards (23) (HK-404L) Polystyrene Standards (24) (HK-401) Polystyrene Standards (25) (HK-402) Show More Applications (Related Information)...
if neglected, can cause substantial overestimations of M n (e.g., 1025%) in the SEC analysis of polydis-perse samples in THF solvent. Theoretical and experimental data are presented for PS, PIB. and polymethylmethacrylate, quantifying the error. Errors in light scattering weight-average ...
Firstly, samples were first isolated by means of two Viscotek T6000M columns. THF was the mobile phase which was stabilized with 300 ppm BHT. In order to ensure complete dissolution, the samples were made to dissolve overnight. Both the detectors and columns were maintained at 35°C in ...
Tetrahydrofuran (THF) 18.5 Polyamide (Nylon 6,6) 27.8 Dimethyl acetamide (DMAc) 24.7 Polydimethyl siloxane (PDMS) 15.5 4.4 Electrical Properties Most plastic materials are dielectrics or insulators, that is, they are poor conductors of electricity and resist the flow of electric current. This is ...
After extraction with acetonitrile (AN) and tetrahydrofuran (THF), PAn shows a unimodal MW distribution. The Mn and Mw of PAn synthesised with AP and FC are: 9,900, 50,700 and 13,500, 55,300, respectively. The intensity-weighted particle size distribution (PSD I ) determined by DLS in...
Size Exclusion Chromatography (SEC) was performed in THF at 40 °C at a flow rate of 1 mL.min -1 . The elution times were converted into molecular weights using a calibration curve based on low dispersity polystyrene standards. The molecular weight and the dispersity were analyzed by SEC. ...
12 After the complete replacement with THF, the molecular weight distribution of the solute shows three typical peaks as shown in Figure l. The peak seen in the largest retention volume is the same as that in the methanolyzed monomeric DODPC solution. The middle and last peaks are observed ...