Abstract
Brassylic acid obtained from crambe oil has been used to make linear polyesters by condensation with 1, 3-butandiol; other polyesters were synthesized for comparison purposes. Number-average molecular weights were determined from the saponification equivalent and by vapor-phase osmometry; viscosity measurements are also reported. These polymers, together with comparison materials, have been evaluated as plasticizers for polyvinyl chloride). The poly(butan brassylates) give plasticized PVC having good mechanical properties at room temperature and, except for extraction with hydrocarbon, with low migration of plasticizer and which are particularly good in retaining flexibility at low temperatures.