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KINETICS AND MECHANISM OF photoinduced polymerization BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE

Chinese Journal of Polymer Science 1993年第1期11卷 26-30页

作者：汪秀智李妙贞常志英王尔(钅监) Institute of Photographic Chemistry Academia Sinica Beijing 100101

α,α-dimethoxy-α-Phenyl acetophenone (DMPA) is an efficient and thermally stable photoinitiator. Here its spectral characteristics in the transient state were shown. The transient species were identified as a benzoyl radical and a dimethoxyi benzyl radical that played a primary initiation role in polymerization. The kinetics and mechanism of the bulk polymerization of MMA were investigated. The exponent of DMPA concentration and k_p/k_1^(1/2) value were found to be 0.5 and 0.066 mol(-1/2)l^(1/2)s^(-1/2), respectively. The existence of oxygen led to obtain the polymer with higher molecular weight, which can be attributed to the occurrence of the subsequent polymerization induced by active polymer end group. In the photocrosslinking reaction, the dependence of DMPA content on initial rate has been found. A principal reason is that the sample contained higher percentage of DMPA has higher light-absorbed efficiency. In solid film, higher concentration of DMPA is permitted to be used because there is little excited state self-quenching effect in the rigid medium.

关键词： α, α- dimethoxy-α-phenyl acetophenone photoinduced polymerization Transient spectroscopy Photocrosslink.

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photoinduced CHARGE TRANSFER polymerization OF STYRENE INITIATED BY ELECTRON ACCEPTOR

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Chinese Journal of Polymer Science 1995年第3期13卷 259-263页

作者：曹维孝张鹏冯新德 Department of Chemistry Peking University Beijing 100871

photoinduced charge transfer polymerization of styrene(St) with electron acceptor as initiator was investigated. In case of fumaronitrile (FN) or maleic anhydride (MA) as initiator the polymerization takes place regularly, whereas the tetrachloro-1,4-benzenequinone (TCQ), 2,3-dichloro-5, 6-dicyano-1, 4-benzenequinone (DDQ). or tetracyano ethylene (TCNE) as initiator the polymerization proceeds reluctantly only after the photoaddition reaction. A mechanism was proposed that free radicals would be formed following the charge and proton transfer in the exciplex formed between St and electron accepters.

关键词： STYRENE ELECTRON ACCEPTOR photoinduced polymerization

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