Sensitized photopolymerization of an ionic liquid-based monomer by using CdTe nanocrystals
Sensitized photopolymerization of an ionic liquid-based monomer by using CdTe nanocrystals
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DOI：
10.1021/ma0707988
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发表时间：
2007-09-04
期刊：
影响因子：
5.5
通讯作者：
Kawai, Tsuyoshi
中科院分区：
文献类型：
--
作者：
Nakashima, Takuya;Sakashita, Makiko;Kawai, Tsuyoshi
半导体纳米晶体已被证明可作为与鎓盐共引发剂组合用于丙烯酸单体光聚合的光敏剂。基于离子液体设计的丙烯酸单体能够溶解共引发剂和阳离子CdTe纳米晶体，并通过可见光照射聚合。由于鎓盐在可见光区域没有敏感性，聚合通过共引发剂的间接活化发生。对 CdTe 纳米晶体与共引发剂的发射猝灭研究和电化学研究表明，聚合反应是由光诱导电子从 CdTe 纳米晶体转移到鎓盐引发的。通过用 FT-IR 监测单体的转化率，将聚合动力学与有机染料敏化光聚合系统进行比较。 CdTe纳米晶的大消光系数和长激发寿命被认为是与鎓盐有效电子转移和高效快速光聚合的原因。
Semiconductor nanocrystal has been demonstrated as a photosensitizer for the photopolymerization of acrylic monomer in combination with an onium salt coinitiator. An acrylic monomer designed based on ionic liquid was able to dissolve both coinitiator and cationic CdTe nanocrystals and polymerized by visible irradiation. Since the onium salt has no sensitivity in the visible region, the polymerization occurred by the indirect activation of coinitiator. Emission quenching study of CdTe nanocrystals with the coinitiator and electrochemical studies on them revealed that the polymerization was initiated by the photoinduced electron transfer from the CdTe nanocrystal to the onium salt. The polymerization kinetics was compared with the organic dye sensitized photopolymerization system by monitoring the conversion of monomer with FT-IR. The large extinction coefficient and long excitation lifetime of CdTe nanocrystals were considered to be responsible for the efficient electron transfer with onium salt and the efficient and rapid photopolymerization.