Degree of polymerization, determination

The degrees of polymerization determined by mass spectroscopy are corroborated by vapor pressure osmometry and gel permeation chromatography studies (21). 

Figure 2. Rate of change of degree of polymerization of H5PO -swollen cellulose by Ct and Cx enzymes of T. koningii cellulose. Residual cellulose was dissolved in Cadoxen (46) and the degree of polymerization determined viscometrically (46).

One distinguishing feature of most synthetic polymers is that they are polydisperse. The entire polymer sample is made up of individual molecules that have a distribution of degrees of polymerization, determined by the particular synthesis method used. If all polymers in a given sample have the same number of monomers, the sampleTs monodisperse. There are many... 

The number of the internal cis units determined from the intensity ratio of either the cis C-l or C-4 methylene signal to the a C-4 methylene carbon signal, was approximately 1000 and 2200 for the polymers S-l and S-2, respectively. Similar NOE and shorter T values for these carbon atoms indicate that an almost quantitative evaluation is possible for the intensity ratios between these methylene carbon signals. The degree of polymerization determined from the a-terminal unit agrees with that from GPC for these samples, i.e., 1100 for S-l and 1800 for S-2. This... 

Figure 4.6-6 Arrhenius plot of the inverse average degree of polymerization, determined by either viscosimetry or size-exclusion chromatography for polyethylenes produced at 2000 bar and various temperatures T, the initiation and thus termination rates are very low in these experiments [37,38].h...

Cleavage degree of polymerization, determined by degradation of branches with pullulanase or isoamylase. 

The number-average degree of polymerization is the number of polymerized units divided by the number of polymer chains, obtained by end-group analysis (e.g., NMR). The weight-average degree of polymerization determines most important properties of a polymer ... 

Figure 25 Synthetic route to graft copolymers (the n values refer to the degree of polymerization determined for the polymers by NMR analysis).

Cg-Ci4 alkyl glucosides Rf in inverse order of degree of polymerization determination in formulations N60 silica gel 80 20 CHCl3/MeOH Thymol and H2SO4 115,116... 

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