One- and Two-Dimensional CP/MAS 13C NMR Analyses of Dynamics in Poly(2-hydroxypropyl ether of bisphenol-A)

The research activities in this subdivision cover structural studies and molecular motion analyses of polymers and related low molecular weight compounds in the crystalline, glassy, liquid crystalline, solution, and frozen solution states by high-resolution solid-state NMR, dynamic light scattering, electron microscopy, X-ray diffractometry, and so on, in order to obtain basic theories for the development of high-performance polymer materials. The processes of biosynthesis, crystallization, and higher-ordered structure formation are also studied for bacterial cellulose. Poly(2-hydroxypropyl ether of bisphenol-A), known as phenoxy resin (PHR), is an amorphous linear polymer and the structure and dynamics have been studied by X-ray diffraction [1], mechanical relaxation [2], and solid-state NMR [3]. Although three relaxations are observed between –100 and –40 ºC, between 20 and 40 ºC, and between 70 and 100 ºC on mechanical relaxation experi-ments, the molecular origins have not been well under-stood. In this article, we investigate the dynamics of PHR by analyzing one- and two-dimensional CP/MAS 13