Лако-красочные материалы — производство

This effect occurs within systems when there are unreacted monomer molecules in solution. As polymerisation proceeds, the solution becomes progressively more viscous and the movement of all molecules is reduced, with the larger molecules being most affected. Under these conditions propagating radicals can no longer freely contact each other and the rate of termination is greatly reduced. The number of radicals increases and the rate of reaction increases correspondingly. At the same time, the half life of the propagating radical is increased as a result of which the molecular weight of the polymer increases rapidly. The Tromsdorf Effect is important in all commercial polymerisations, where a high degree of conversion is required. It is most marked in systems containing methyl methacrylate.