Size-exclusion chromatography number average

Standard entropy change in interaction chromatography Standard entropy change in size exclusion chromatography Number average degree of polymerization... 

A reliable procedure for determination of molecular parameters number, weight and z-averages of the molecular weight (Mj, i = n, w and z respectively) for polyethylenes, PE, by means of Size Exclusion Chromatography, SEC, has been developed. The Waters Sci. Ltd. GPC/LC Model 150C was used at 135 C with trichlorobenzene, TCB, as a solvent. The standard samples as well as commercial stabilized and not stabilized PE-resins were evaluated. The effects of sampling, method of solution preparation, addition of antioxidant(s), thermal and shear degradation were studied. The adopted procedure allows reproducible determination of and M , with a random error of 4% and M2, with 9%, within 2 to 72 hrs from the initial moment of preparation of solutions. 

Number average molecular weight data from size exclusion chromatography for polymers A through E has been given previously... 

Table 8.3.2. Number-average molecular weights of spruce dioxane lignin fractionated by preparative size exclusion chromatography (Pla and Robert 1974a, Froment and Robert 1977)...

Over the last ten years evidence has accumulated that pectin can undergo self disaggregation (1-4). More recently, by size exclusion chromatography (SEC) and determination of number-average degrees of... 

Comparison of number average lengths obtained from end group titration, 1 (EGT), and from size exclusion chromatography 1 (SEC)... 

M]o = 0.5 mol L and [M]o/[BIBA]o=100. Monomer conversion, determined by H NMR in D2O > 99%. The theoretical-number-average molecular weight, evaluated according to the formula, A4 =ATM conv [M]o/[BlBA]o+ATBiBA = H-5 kg/mol. measured by size-exclusion chromatography (SEC) using polystyrene standards in 1-N-methylpyrrolidone (NMP) as eluent. 

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