PENTAD DISTRIBUTION OF ACRYLIC COPOLYMERS BY C-13 NMR-SPECTROSCOPY

The carbonyl signal of the 100 MHz C-13 NMR spectrum of methacrylate/a crylate copolymers provides sufficient resolution for detailed analysi s of sequence distribution up to configurational-compositional pentads . It has been shown for the investigated methyl methacrylate/ethyl acr ylate copolymer, MMA/EA, that the spectrum of carbonyl region can be p ositively simulated by applying Bernoulli/1st order Markov statistics to calculate the sequence intensities and a method of incremental calc ulation of chemical shift to determine the line positions. The method may be readily adopted for other acrylate/methacrylate copolymer syste ms.