β Scribed by Dunlap, L. H. ;Foltz, C. R. ;Mitchell, A. G.
No coin nor oath required. For personal study only.
Specific heats of a series of plasticized and unplasticized poly(vinyl chloride) compositions have been determined by a differential scanning calorimeter over the temperature range 200β400Β°K. The glass temperatures were higher and the specific heat values at 300Β°K lower with phthalate esters then with esters of aliphatic acids; those values were also higher and lower, respectively, with benzylβcontaining esters than with the methyl or octyl esters. The data were treated by a computer technique and plotted. A mathematical expression was developed which would describe the curves obtained when specific heat was plotted against temperature, and provided values in each case for the glass temperature and the specific heat at the glass temperature and at 300Β°K, as well as other descriptive parameters.
π SIMILAR VOLUMES
A sample of poly (vinyl chloride) (PVC) and a polar plasticizer consisting of dioctyl phthalate (DOP) and dibutyl phthalate ( D B P ) was prepared and found to possess inconvenient electrical properties (permittivity, dielectric loss, and conductivity). Different samples of PVC compositions were for
Different samples of filled poly(vinyl chloride) (PVC) compositions were formulated from PVC, a polar plasticizer mixture consisting of dioctylphthalate (DOP) and a chlorinated paraffin, and variable proportions of a white filler such as barite, calcium carbonate, kaoline, quartz, or talc; a conduct