Effect of pulsed magnetic field treatment on the crystallization and melting of organosilicon polymeric materials

A permanent increase in crystallization temperature T-c and a permanent dec rease in the melting temperature T-m upon treatment of SKTV-1 organosilicon polymer with a pulsed magnetic field (PMF), were discovered. The PMF-induc ed changes in T-c and T-m persisted for a long time after the application o f PMF, being stable with respect to repeated crystallization-melting cycles . Static magnetic fields and pulsed electric fields do not produce such eff ects. Based on a proposed qualitative model, it was shown that the increase in T-c can be explained by an increase in the molecular mass and viscosity of the polymer due to the cross-linking of the polymer chains under the ac tion of PMF on the spin-controlled radical reaction of terminal units. The reduction in T-m is due to a decrease in the size of the supramolecular str uctures formed during the crystallization of SKTV-1.