Infrared spectra and crystallinity of isotactic poly(methyl methacrylate) and of its deuterated analogues

Abstract Infrared spectra of partially crystalline and amorphous samples of isotactic poly(methyl methacrylate) (i‐PMMA), poly[methyl (α,α,α‐2H3)methacrylate] (i‐PMMA‐α‐CD3), poly‐[(2H3)methyl methacrylate] (i‐PMMA‐OCD3), and poly[(2H3)methyl (α,α,α,2,2‐2H5)methacrylate] (i‐PMMA‐D8) were measured. Infrared spectra of the pure crystalline forms of these substances were obtained by digital separation. It was found that in acetonitrile, CDCl3, and toluene solutions, i‐PMMA has the same conformational structure as in the amorphous state; conformational structures of crystalline i‐PMMA are not present in the solutions in measurable amounts.