Local Molecular Motion of Polystyrene Model Compounds Measured by Picosecond Pulse Radiolysis. 3. Diastereomeric Styrene Dimer, Trimer, and Tetramer in Poly(methyl methacrylate) Solid Solution

Hideyuki Itagaki, Kazuyuki Horie, Itaru Mitaz, Masakazu Washio, Seiichi Tagawa, Yoneho Tabata, Hisaya Sato, Yasuyuki Tanaka

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The photophysical properties of diastereomeric oligostyrenes, meso (m) and racemic (r) 4,6- diphenylnonanes (PS2); mm-, mr-, and rr-4,6,8-triphenylundecanes (PS3); and mmm-, mmr-, mrm-, rrm-, and rrr-4,6,8,10-tetraphenyltridecanes (PS4), in poly(methyl methacrylate) (PMMA) were studied by photostationary and transient measurements. The fluorescence spectra of PS2, PS3, and PS4 with meso diads exhibited excimer fluorescence even in PMMA solid solution where conformational changes are restricted, suggesting that the population of tt, an excimer conformer, in the meso diad is noticeable even in low molecular weight compounds such as PS2, PS3, or PS4. Monomer fluorescence of oligostyrenes in PMMA decayed single exponentially with the same time constant as that of cumene. The observed monomer fluorescence is assumed to come from a molecule that has no excimer conformer while a molecule having excimer conformers does not exhibit monomer fluorescence. Fluorescence polarization measurements at 77 K and at room temperature demonstrated that the reorientational motion of phenyl groups was not perfectly restricted in PMMA solid solution. The efficiency of the energy migration among the phenyl rings in PS2, PS3, and PS4 was not so outstanding that it could induce the fluorescence depolarization.

Original languageEnglish
Pages (from-to)1686-1690
Number of pages5
JournalMacromolecules
Volume23
Issue number6
DOIs
Publication statusPublished - 1990 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Local Molecular Motion of Polystyrene Model Compounds Measured by Picosecond Pulse Radiolysis. 3. Diastereomeric Styrene Dimer, Trimer, and Tetramer in Poly(methyl methacrylate) Solid Solution'. Together they form a unique fingerprint.

  • Cite this