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

Xiaoyue Zhou; Kaipin Xu; Pei Ni; Qun Chen; Shanmin Zhang

doi:10.1016/j.ssnmr.2017.04.005

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

Solid State Nucl Magn Reson. 2017 Sep:85-86:34-40. doi: 10.1016/j.ssnmr.2017.04.005. Epub 2017 Apr 27.

Authors

Xiaoyue Zhou¹, Kaipin Xu¹, Pei Ni¹, Qun Chen², Shanmin Zhang³

Affiliations

¹ Physics Department and Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, No. 3663, North Zhong Shan Road, Shanghai 200062, China.
² Physics Department and Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, No. 3663, North Zhong Shan Road, Shanghai 200062, China. Electronic address: qchen@admin.ecnu.edu.cn.
³ Physics Department and Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, No. 3663, North Zhong Shan Road, Shanghai 200062, China. Electronic address: shanminz@hotmail.com.

PMID: 28501714
DOI: 10.1016/j.ssnmr.2017.04.005

Abstract

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 (T₁) information was acquired. After the correction based on the reciprocity relation, the overlapped peaks were resolved and quantified together with their T₁'s. Crystallinity is therefore observed naturally according to components' content ratios associated with their T₁ values.

Keywords: Multi-curve resolution; Peak overlapping; Polymer crystallinity; Spin-lattice relaxation.

Publication types

Research Support, Non-U.S. Gov't