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 Mita, Masakazu Washio, Seiichi Tagawa, Yoneho Tabata, Hisaya Sato, Yasuyuki Tanaka

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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-, 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.

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

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ASJC Scopus subject areas

  • Materials Chemistry

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