Dilute solutions of linear and branched poly(ethylene terephthalate) (PETP) samples were investigated in various solvents (or mixed solvents) by osmometry, light scattering and viscometry. Branched PETP samples were obtained with the polyfunctional comonomers trimethylolpropane (functionality f = 3) and pentaerythritol ( f = 4). For the branched samples, we determined the index of branching g' and compared the experimental results with polycondensation theory in order to estimate the average number of branches per molecule. Finally, the melt viscosity (at 290°C) of branched PETP was measured and compared with the melt viscosity of linear PETP.
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Langla et al. (1986) studied this question.
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