Variation with molecular weight

Figure 14. Variation with molecular weight exhibited by ratios of absorbance values at 230 and 300 nm for paucidisperse kraft lignin fractions in aqueous 0.10 M NaOH from ( ) associated sample after 385 h at 180 gL 1 in 1.0 M ionic strength aqueous 0.40 M NaOH (O) original preparation ( ) dissociated sample precipitated upon acidification to pH 3.0 after 2000 h at 0.50 gL"1 in aqueous 0.10 M NaOH.

Williams then estimates with Kirkwood s equation, employing the Fixman-Peterson expression for g r) in chain molecules. He arrives at a variation with molecular weight of the form oc M1/4. Williams then estimates the chain length dependence of C by a dimensional argument, concluding that C ccS5 ccMslz. The final result is of the form... 

Decrease in tensile strength and elongation at break is observed for reactor-irradiated PMMA [424]. Conversion of the neutron dose to equivalent 7-irradiation and variation with molecular weight was reported by Charlesby [424] it is reproduced in Fig. 49. It can be seen that the mechanical properties begin to deteriorate rapidly when the molecular weight is lower than 5 x 104. 

Figure 3. Variation with molecular weight of the inflection frequency ve (Equation 1) of the relaxation dispersion of solvent protons fen- solutions of macromolecules at 25°C.

Figure 8.S. Lamellar thickness variation with molecular weight...

It is interesting to observe that cholesteric copolyesters synthesized from i+,U -dihydroxyazoxybenzene and mixtures of (+) -3-methyl-adipic acid and dodecanedioic acid do not orient. Systematic variations with molecular weight and careful analysis in certain homologous series should give information on the influence of the intrinsic flexibility of the chains, the apparent viscosity of the melt and certain basic microscopic processes such as entanglement effects on the tendency for macromole cular chains to become aligned when placed in a magnetic field. 

Strausz, O.P., Safarik, I., Lown, E.M. (2009) Cause of asphaltene fluorescence intensity variation with molecular weight and its ramifications for laser ionization mass spectrometry. Energy Fuels, 23,1555-1562. 

Fig. 10. Domain size variation with molecular weight of domain formii block, M for styrene-isoprene block copolymers. O Spherical domain Lamellar domains a Cylindrical domains...

Which EOS theories allow for variation with molecular weight of the... 

SANS) of isotactic polystyrene" indeed stress the complications introduced by morphology and its variation with molecular weight and crystallization rate. 

Wolf BA, Adam HJ (1981) Second osmotic virial coefficient revisited - variation with molecular weight and temperature from endo- to exothermal conditions. J Chem Phys 75 4121... 

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