Пластмассы. Определение числа вязкости разбавленных растворов поливинилхлоридных смол
Название (англ.):
Plastics; Determination of viscosity number of PVC resins in dilute solution
Описание (англ.):
Specification of a method for the determination of the viscosity number of PVC resins or copolymers in which the principal constituent is vinylchloride. The viscosity number thus determined gives an approximation of the molecular mass of the PVC resin. Preparation of a solution of 0,005 g/ml of resin in Cyclohexanone according to defined conditions and measurement of the time of flow of this solution and of the solvent, using asuspended level capillary viscosimeter. Calculation of the viscosity number from these measurement results.