Molecular mobility of poly(methyl methacrylate): a time-resolved electron spin resonance study with photoexcited triplet-state phenazine as a probe

Journal Article · Thu Aug 27 04:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100302a039· OSTI ID:6091107

Kim, S S; Tsay, F D; Gupta, A

Molecular mobilities of poly(methyl methyacrylate) (PMMA) doped with phenazine as a probe were investigated by employing a time-resolved electron spin resonance (ESR) technique. Amplitudes of the transient ESR responses from photoexcited triplet phenazine molecules were monitored immediately after a pulse from an excimer laser (308 nm). The amplitudes were measured at several microwave powers with the probes in PMMA matrices of different average molecular weights. The transient ESR data are found to correlate with the relative molecular mobilities of hot matrices as reflected by the differences in their glass transition temperatures. The time scale of motions detected by this method in is the range of 10/sup -4/-10/sup -6/ s.

• Research Organization: California Institute of Technology, Pasadena
• OSTI ID: 6091107
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:18; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBOXYLIC ACID ESTERS
DATA
ELECTRON SPIN RESONANCE
ESTERS
EXCIMER LASERS
EXPERIMENTAL DATA
GAS LASERS
INFORMATION
LASERS
MAGNETIC RESONANCE
METHACRYLIC ACID ESTERS
METHYL METHACRYLATE
MOBILITY
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYMERS
RESONANCE
RF SYSTEMS
TIME DEPENDENCE