Abstract
Materials with various contents of grafted acid groups have been prepared by radical addition of thiols to the double bonds in polybutadiene. For their determination, a method involving NMR and determination of Mn is prepared. The glass transition temperature increases with the content of grafted acid groups. Intermolecular hydrogen bonds have been found by i.r. and viscosity studies. Relations between the ratio of free to bonded carbonyl groups and temperature and between log η 0 and (temp.) −1 are linear for all samples with a change of slope between 120° and 140°C. This effect is found also for non-functional samples of polybutadiene; it is discussed in terms of the liquid-liquid transition T 11 and it is probably due to change in chain conformation.
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