| TEMPERATURE DEPENDENCE OF THE FLUORESCENCE SPECTRA OF LADDERLIKE POLYPHENYLSILSESQUIOXANE AND LADDERLIKE 1,4-PHENYLENE-BRIDGED POLYVINYLSILOXANE |
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| 引用本文： | 张榕本. TEMPERATURE DEPENDENCE OF THE FLUORESCENCE SPECTRA OF LADDERLIKE POLYPHENYLSILSESQUIOXANE AND LADDERLIKE 1,4-PHENYLENE-BRIDGED POLYVINYLSILOXANE[J]. 高分子科学, 2002, 0(1): 15-23 |
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| 作者姓名： | 张榕本 |
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| 作者单位： | PCLCC，Center for Molecular Science，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080 China Polymer Chemistry Laboratory，Chinese Academy of Sciences and China Petro-Chemical Corporation |
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| 基金项目： | The authors gratefully thank the National Natural Science Foundation of China (No. 29874034, 29992530, 29873060) and Dow Corning Corporation for their financial support. |
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| 摘 要： | Fluorescence spectra of ladderlike polyphenylsilsesquioxane (LPPS) and ladderlike 1,4-phenylene-bridgedpolyvinylsiloxane (LPPVS) have been measured as a function of temperature (4-55℃), in dilute tetrahydrofuran solution.The excimer (I_E) to monomer (I_M) intensity ratio (I_E/I_M) of LPPS dilute solution shows a double linear Arrhenius plot with abreak point ascribable to a transition temperature T_t This behavior has not been found for single chain polyorganosiloxanes.When InI_E of LPPS was plotted against I/T it also gave a double linear plot with one break point, which was found in singlechain polyorganosiloxanes. The different behaviors between LPPS and single chain polyorganosiloxanes may be mainlyattributed to the relatively rigid double-chain macromolecular backbone of LPPS. However, the In(I_E/I_M) of dilute LPPVSsolution versus I/T shows a simple linear variation with a positive slope which confirms our proposition. The differencebetween the fluorescence results of LPPS and those of LPPVS may possibly derive from their structure differences andcooperative motion in backbone chain bonds.
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| 收稿时间： | 2001-02-05 |
| 修稿时间： | 2001-03-27 |
TEMPERATURE DEPENDENCE OF THE FLUORESCENCE SPECTRA OF LADDERLIKE POLYPHENYLSILSESQUIOXANE AND LADDERLIKE 1,4-PHENYLENE-BRIDGED POLYVINYLSILOXANE* |
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| Jun-lin Yang,Feng-lian Bai,Chun-qing Liu,Yang Liu,Ping Xie,Rong-ben Zhang. TEMPERATURE DEPENDENCE OF THE FLUORESCENCE SPECTRA OF LADDERLIKE POLYPHENYLSILSESQUIOXANE AND LADDERLIKE 1,4-PHENYLENE-BRIDGED POLYVINYLSILOXANE*[J]. Chinese Journal of Polymer Science, 2002, 0(1): 15-23 |
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| Authors: | Jun-lin Yang Feng-lian Bai Chun-qing Liu Yang Liu Ping Xie Rong-ben Zhang |
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| Affiliation: | Center for Molecular Science; Institute of Chemistry Chinese Academy of Sciences; Beijing 100080; China PCLCC; Center for Molecular Science; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100080 China Polymer Chemistry Laborato |
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| Abstract: | Fluorescence spectra of ladderlike polyphenylsilsesquioxane (LPPS) and ladderlike 1,4-phenylene-bridgedpolyvinylsiloxane (LPPVS) have been measured as a function of temperature (4-55℃), in dilute tetrahydrofuran solution.The excimer (IE) to monomer (IM) intensity ratio (IE/IM) of LPPS dilute solution shows a double linear Arrhenius plot with abreak point ascribable to a transition temperature Tt This behavior has not been found for single chain polyorganosiloxanes.When lnIE of LPPS was plotted against 1/T,it also gave a double linear plot with one break point,which was found in single chain polyorganosiloxanes.The different behaviors between LPPS and single chain polyorganosiloxanes may be mainly attributed to the relatively rigid double-chain macromolecular backbone of LPPS.However,the ln(IE/IM) of dilute LPPVS solution versus 1/T shows a simple linear variation with a positive slope which confirms our proposition.The difference between the fluorescence results of LPPS and those of LPPVS may possibly derive from their structure difference and cooperative motion in backbone chain bonds. |
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| Keywords: | Ladderlike polyphenylsilsesquioxane Ladderlike 1 4-phenylene-bridgd polyvinylsiloxane Fluorescence spectra Temperature dependence |
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