1986 Fiscal Year Final Research Report Summary
Study of the Photochemical Reactions and Molecular Motion of Some Aromatic Polymers by Luminescent Probe Method.
| Project/Area Number |
60470109
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Faculty of Engineering, University of Tokyo. |
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Principal Investigator |
MITA Itaru Fac. of Engg., Univ. of Tokyo, 工学部, 教授 (10013632)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Akio Fac. of Engg., Univ. of Tokyo, 工学部, 助手 (90013721)
KOCHI Masakatsu Fac. of Engg., Univ. of Tokyo, 工学部, 助手 (90013705)
HORIE Kazuyuki Fac. of Engg., Univ. of Tokyo, 工学部, 助教授 (10013690)
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| Project Period (FY) |
1985 – 1986
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| Keywords | Aromatic Polymer / Exicimer / Molecular Aggregation / Molecular motion / Photochemical reaction / Poly(p-xylylene) / Poly(ethylene naphthalendicarboxylate) / ポリエーテルスルホン |
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| Research Abstract |
Photophysical and photochemical processes of some aromatic polymers have been studied from the point of view of molecular motion and molecular aggregation in solid state. Poly-p-xylylene(PPX) shows only weak monomer and excimer flurescences while its aliphatic isomer, polystyrene, shows very strong excimer fluorescence. The difference is attributed mainly to the geometric placement of benzene rings in crystalline PPX. Two strong fluorescences at lower wave length region, attributed to the contaminated stilbene structure, is found to be an very good probe for the aggregation structure of the polymer. Poly(ethylene naphthalenedicarboxylate), an amorphous polymer, shows a strong excimer fluorescence. The fraction of the excimer site, determined from the temperature dependence of the fluorescence intensity, is near 0.1 and increases by heat treatment. Polyethersufone was found to undergo crosslinking, chain scission and rearrangement by photoirradiation. The rates of the reactions in solid polymer is much lower than those of model reactions in solution, showing that the reactions are controlled by diffusion. The activation energy for the photocrosslinking is higher than that or chain scission, indicating the difference of the size of reactants concered. The break of the Arrhenius plot for the crosslinking reaction at 170゜C shows that the mode of the motion concered changes at a temperature lower than Tg of the polymer by 40-50 ゜C.
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Research Products
(8 results)
