Viscosity and Glass-Transition Behavior of Polymer—Diluent Systems¹

Abstract

10~1 234 5cm. for the calculation. The sharp peaks are a result of the discontinuous change from 9X to S2 at the boundaries. If our model had varying continuously between 9X and 02 then the barrier would have been rounded. The linearity of the sides of the barriers shows that the first term in eq. II-ll predominates.

Influence of dibutyl phthalate on the mechanical, thermal, and relaxation behaviour of poly (methyl methacrylate) for denture-base soft liners

“…Tg value is reasonable for a phthalate ester of this type [12,[21][22][23] and has been supported by the results obtained from the DSC measurements of Fig. 4 (Tg = -81 °C).…”

Viscosity of concentrated polymer solutions. II. Application of a free‐volume treatment to solutions of poly(vinyl chloride) in cyclohexanone and to other polymer solutions

“…The application of eqs. (12) and (13) to the results presented previously' on PVGcyclohexanone solutions requires the knowledge of the fractional free volumes fi and fi of polymer and solvent at 30°C. As this temperature is below the glass transition temperature of the polymer, reported as 82°C.…”

“…Equations (12) and (13) should predict the viscosity of polymer-solvent systems above their glass transition temperatures over the entire range of concentration and for any molecular weight. A t constant molecular weight and temperature, eq.…”

“…Insertion of fi and fi in eqs. (12) and (13) gives ln(q/B) and ln(q/B') as a function of concentration. This can be expressed as weight fraction w2, calculated from 42 by assuming the volumes of solvent and polymer to be additive.…”

Diallyl orthophthalate as a reactive plasticizer for improving PVC processibility. Part I: Polymerization kinetics

“…The T g of DAOP monomer was measured with a TA DSC Q100 differential scanning calorimeter at 10 C per min and was found to be À90 C (with a heat capacity step of 0.55 J/ g K) which compares favourably with T g s of À85 C, À82 C and À72 C for diethyl phthalate [18], dioctyl phthalate [18], and dibutyl phthalate [19], respectively.…”