A Rheological and Structural Study of Polymer NetworksContents of this doctoral dissertation include: primary polymer molecules with a mondisperse distribution of the molecular weights, crosslinks of any functionality, primary polymer molecules with a disperse distribution of the molecular weights, the sol fraction, number and weight average degrees of polymerization, Schulz-Zimm distribution, fractions of ideal networks and dangling ends, molar masses between the crosslinks |
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Page 97
... temperature remained the same ( shown in figure 4.2b ) . At a temperature of 25 ° C and a deformation frequency of 1 rad / s the viscoelasticity of the network already becomes non - linear at a strain of only 1 % . An increase in ...
... temperature remained the same ( shown in figure 4.2b ) . At a temperature of 25 ° C and a deformation frequency of 1 rad / s the viscoelasticity of the network already becomes non - linear at a strain of only 1 % . An increase in ...
Page 108
... temperatures . However , a decrease of the temperature from 60 to 30 ° C causes the appearance of a stress plateau at low shear rates . These results indicate the presence of a yield stress in the system at temperatures of 40 ° C and ...
... temperatures . However , a decrease of the temperature from 60 to 30 ° C causes the appearance of a stress plateau at low shear rates . These results indicate the presence of a yield stress in the system at temperatures of 40 ° C and ...
Page 126
... temperature can be determined . In figure 5.5 , the crosslink functionality is plotted as a function of the temperature at a constant crosslink density , Ner , for the three different systems . Therefore , the crosslink density at the ...
... temperature can be determined . In figure 5.5 , the crosslink functionality is plotted as a function of the temperature at a constant crosslink density , Ner , for the three different systems . Therefore , the crosslink density at the ...
Common terms and phrases
1,1,2-trichloroethane active network chains average crosslinking index average molar mass average molecular weight calculated crosslink functionality crosslinked system crosslinks per unit curves cycle rank dangling ends decrease deformation degree of polymerisation discotic side chain discotic side-chain polymers disperse distribution dynamic elastically active network ended mesogens equilibrium shear modulus figure Flory fraction of dangling fraction of ideal Franse frequency high shear rates increase kg/mol mijn molecular weight distribution monodisperse distribution N/m² network of polymer network parameters Nijenhuis number and weight number average degree number average molecular number of crosslinks physical network poly(vinyl chloride polydispersity index polymeric primary polymer molecules relationship rheological measurements Schulz-Flory distribution Schulz-Zimm distribution shear rates side chain polymer sol fraction solubility parameter solution of discotic solvent storage modulus strain structure substituting equation temperature tetrafunctional crosslinking unit volume values viscoelastic viscosity w/w solution w₁ weight average crosslinking weight average degrees weight average molecular yield stress zijn