Chain entanglement in poly(methyl methacrylate), polystyrene, poly(N-phenylmaleimide), poly(methyl methacrylate-stat-styrene), poly(methyl methacrylate-stat-N-phenylmaleimide) and poly(methyl methacrylate- stat-styrene-stat-N-phenylmaleimide) is studied in the melt by dynamic viscoelastic spectroscopy. It is shown that the plateau modulus is equal to the storage modulus at the minimum of loss tangent. The plateau modulus and the entanglement molecular weight are found to obey the geometric mean relationship with respect to composition, i e log GN0 = E v log GN0 and log Me = E v log Me ,, where GN0 is the plateau ' J J J j modulus, Me the molecular weight between entanglement points, v i the volume fraction of comonomer j, G°~ the plateau modulus for the homopolymer of j and M,j the entanglement molecular weight for the homopolymer of j. The G ° and M e of homopolymers and copolymers may also be predicted by group additivity method
Посилання на статтю:
Chain entanglement in homopolymers, copolymers and terpolymers of methyl methacrylate, styrene and N-phenylmaleimide* / Souheng Wu and Richard Beckerbauer // Polymer. – 1992. – Vol 33. – P. 509-515.