title: Three-dimensional single molecule rotational diffusion in glassy state polymer films.
abstract: Measuring three-dimensional orientational motions of many individual molecules within glassy state poly(methyl methacrylate) has enabled nanoscopic probing of bulk-obscured polymer dynamics. Complementing bulk studies, the measured distributions of nanoscale barriers to rotational motion afforded by our single molecule orientational methods directly probe the spatial heterogeneity and nanoscopic alpha-relaxation dynamics deep within the glassy state.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Bartko
authors.forename: Kewei
authors.initials: K
authors.lastname: Xu
authors.forename: Robert M
authors.initials: RM
authors.lastname: Dickson