2. Polymer Molecular Weights

Gel Permeation Chromatography of Polysaccharides: Universal Calibration Curve

“…2 is defined as the count where 50% of the amylopectin sample was eluted. When the V' instead of V was plotted against log [1]]M, the plot fell on a straight line as shown in Fig. 1.…”

“…5 cm 3 ). Table I summarizes the values of M w' [1]] and the peak volume, V. Figure 1 shows the plots of log [1]]M vs. V for all samples. A straight line resulted for all samples except some amylopectin fractions.…”

“…ciple that the elution volume in GPC can be governed by the viscometric hydrodynamic volume, [1J]M, where [1]] is the intrinsic viscosity and M the molecular weight.…”

Molecular weight and molecular weight distributions in synthetic polymers

“…Four to five concentrations between 0.05 and 2 wt.% are ordinarily sufficient to identify [ij]. Non-linearities which sometimes occur in the rjsp/c versus c line are discussed in other sources (6). As a rough estimate, when [77] exceeds 0.50 dl/g for an unknown sample, reasonably high MW's are present.…”

“…In addition, the current most popular instrumental methods which might, be applied to characterize MWD are reviewed with an emphasis on the physical chemistry of each. The reader interested in more detailed discussions of hardware or in rigor of the theoretical development will find two excellent recent reviews (5,6). Textbooks in polymer science may be helpful in providing alternative fundamental discussion (7,8,9).…”