louboutin replica

Polymer Standards for Size Exclusion Chromatography 
in Organic solvents (for hydrophobic molecules)

 Calibration in THF, Toluene, Xylene

The standard reference polymers that are soluble in organic solvents such as tetrahydrofurane, toluene, xylene, etc, are used for instrumencalibration or quality control during the performance of Size Exclusion Chromatography (SEC) tests of molecules insoluble in water.

The following standards are used for calibration of non polar (hydrophobic) polymers

Calibration in DMAc, DMF and DMSO

Polymers that  present polarity are most often analized in polar mobile phases such as n,n-DIMETHYLACETAMIDE (ACETIC ACID, DIMETHYLAMIDE) (DMAc) ; Dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). 

The following standards are also available at PSS for calibration with polar solvents 

Nylon 6 Broad
Poly(2-vinylpyridine)
Poly(alpha-methylstyrene)
Poly(butadiene-1.2)
Poly(butadiene-1.4)
Poly(carbonate)
Poly(dimethylsiloxane) 
Poly(ethyl methacrylate)
Poly(ethylene terephthalate)
Poly(ethylene)
Poly(isobutylene)
Poly(isoprene-1.4)
Poly(isoprene-3.4)
Poly(L-lactide)
Poly(methylmethacrylate)
Poly(n-butyl methacrylate)
Polystyrene
Poly(vinyl chloride)
Poly(t-butyl acrylate)
Poly(t-butyl methacrylate)
Poly(vinyl acetate) 
Poly(vinyl chloride)
Poly(vinyl pyrrolidone) broad

 

 

Most common Narrow standards of Poly(methylmethacrylate) run with PSS Gram columns

Size Exclusion Chromatography (SEC) calibrations in these solvents usually perform better when the calibration molecule shows a siimilar degree of polarity

 

By far the most commonly used are Narrow standards of Polystyrene, run through hydrophobic columns such as the PSS SDV columns.

The majority of neutral (non polar) testing systems in organic solvents; copolymers, and resins. can be initially separated and charavterized by molecular weight using either a Refractive Index (RI) or an Ultra Violet (UV) detector. 

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