Verification of a model explaining the viscosity divergence of gamma irradiated polymeric liquid

The change of viscosity with concentration of suspended particles and a new concept of gelation

“…The variations of the scaled viscosities (η/η 0 ) of the 21.21 and 32.47 P grades of PDMS containing powdered silicon and glass suspended particles plotted as functions of the volume fraction are shown in figures 1 and 2. All four sets of data fit excellently with our [6] earlier result on the viscosity variation as a function of the concentration (here the volume fraction is φ) of suspended particles obtained using the random-resistance-network model [7]: where η 0 is the viscosity of the pure PDMS liquid. The values of φ and γ obtained by least-squares fitting are presented in table 1.…”

Viscosity divergence and gelation

“…Realizing the difficulty in ascertaining the concentration of suspended clusters in gamma irradiated PDMS, we plan to measure viscosity change with varying concentration of suspended particles homogeneously mixed in PDMS. Experiments (Halder et al, 1995(Halder et al, , 1997 performed by measuring the change in viscosity in PDMS with varying concentrations of suspended particles of silicon and glass powder confirms the validity of Eq. (2).…”