Diffusion and phase relaxations within the interphase domain of polymer blendlike particles

✍ Scribed by Önder Pekcan

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 618 KB
• Volume: 59
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960118)59:3<521::aid-app18>3.0.co;2-w

✦ Synopsis

A single-photon counting technique in conjunction with a direct energy transfer (DET) method was used to study the diffusion of small dye molecules within the interphase domain of anthracene (An)-and/or phenanthrane (Phe)-labeled poly(methy1 methacrylate) (PMMA) particles sterically stabilized by polyisobutylene (PIB). Mean lifetimes of fluorescing donor molecules were measured during diffusion. A Fickian model for diffusion was employed to fit the experimental data and diffusion coefficients were found to be around cmz/s a t room and above glass transition temperatures (T,) for the corresponding samples, respectively. A reversed Gaussian distribution was detected for the PMMA phase density a t the interphase domain. An increased amount of self-quenching of naphthalene (N) dyes labeled to the PMMA phase was investigated against annealing temperature above TK and the results were attributed to phase relaxations at the interphase domain.