On Present Theories of the Condensed Polymer State

Abstract

Abstract

Dilatometric measurements on some polymers: The pressure dependence of thermal properties

“…10 shows our measurement on PE up to 10 kbar. In a following paper (19) we shall discuss the new intermediate phase proposed by Bassett and coworkers (6,7,8) which can be seen in fig. 10 above 4 kbar interpreting the plot as a phase diagram.…”

A review of the experimental data from the high pressure phase in polyethylene

“…Besides Bassett's original idea (20), a combination of trans and gauche bonds along the chain in a manner which was not specified, Pechhol~l and coworkers (2,(31)(32)(33)(34) have attempted to develop a model, based on semiempiric atomistic calculations. Suggestions have to comply with the geometrical data from X-ray and dilatometry, the results on thermodynamic transition quantities and they have to explain the, unfortunately, rare additional properties known of the phase.…”

On the solid state phases of poly(trans-1,4-butadiene)

“…Furthermore, in chain direction they can be combined arbitrarily; this does not exclude the existence of lateral blocks and need not reduce entropy (24). Thus, the lower limit for the conformational entropy will be R.ln4 per double unit or 0.11 J/g-K. Corradini's value had been R.ln 9 per mole which means 0.34 J/g" K (5).…”