Abstract
Heat capacities of solid polyparaphenylene, two variously substituted poly(oxy-1,4-phenylene)s, poly(thio-1,4-phenylene), polyparaxylylene, poly(4,4′-isopropylidenediphenylene carbonate), poly(ethylene terephthalate) and poly(oxy-1,4-phenylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene) were analysed using an approximate group vibration spectrum and fitting of the skeletal heat capacity to a corrected Tarasov function. The prior developed calculation scheme needed adjustment by two vibrational modes when introducing the phenylene groups. The characteristic parameter θ 1 of these polymers has been found to follow a linear relationship with the square root of the weight fraction of phenylene groups in the repeating units, and θ 3 varies little from polymer to polymer in this group ( θ 3 = 40 K). An addition scheme based on approximate frequency spectra for heat capacities of polymers containing phenylene groups is proposed. Its precision is close to experimental accuracy.
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