VISCOELASTIC PROPERTIES OF PHOSPHINATE POLYMERS.
Abstract
The viscoelastic properties of several phosphinate inorganic coordination polymers have been investigated. By utilizing a ball-indentation method, the creep compliance, Jc(t), has been measured as a function of time for two samples of zinc methylphenylphosphinate of differing molecular weight. From results at different temperatures, master curves of compliance versus time could be constructed using the time-temperature superposition principle. The creep behavior for both samples was found to be a fair approximation to that of a Maxwell body; it is thus concluded that both polymers are of low molecular weight in the solid state. The temperature dependence of the shift factors, used in constructing the master curve, is of an Arrhenius form over most of the temperature range considered, giving apparent activation energies of 90 and 80 kcal/mole for lower and higher molecular weight samples respectively. Volume temperature measurements indicate that the glass transition temperature, Tg, for the higher molecular weight polymer is 56 C. The elastic modules of a 1:1 copolymer of zinc di-n-butylphosphinate and zinc di-n-octylphosphinate has been measured as a function of time and temperature using torsional creep and stress relaxation techniques. Results indicate that this copolymer is slightly crystalline, a conclusion supported by X-ray studies. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1965
- Accession Number
- AD0465910
Entities
People
- A. D. Mair
- Arthur V. Tobolsky
Organizations
- Princeton University