Determination of polymer crystallinity by the multivariable curve resolution method in 13C solid NMR spectrum

Most of the polymers are composed of a crystal part, an amorphous part, and a transitional interfacial part. These components present disparate physical and chemical characteristics. However, it always suffers from peak overlapping in solid NMR spectrum in order to acquire polymer's crystallinity. The polyethylene oxide (PEO) sample was tested using the Torchia pulse sequence combined with the Multivariate Curve Resolution (MCR) method. A two dimensional CP/MAS spectrum containing spin-lattice relaxation time (T-1) information was acquired. After the correction based on the reciprocity relation, the overlapped peaks were resolved and quantified together with their T-1's. Crystallinity is therefore observed naturally according to components' content ratios associated with their T-1 values.