Classical photopolymerization kinetics, exceptional gelation, and improved diffraction efficiency and driving voltage in scaffolding morphological H-PDLCs afforded using a photoinitibitor

	Classical photopolymerization kinetics, exceptional gelation, and improved diffraction efficiency and driving voltage in scaffolding morphological H-PDLCs afforded using a photoinitibitor
	Peng, Haiyan; Chen, Guannan; Ni, Mingli; Yan, Yan; Zhuang, Jiaqing; Roy, V. A. L.; Li, Robert K. Y.; Xie, Xiaolin
刊名	Polymer Chemistry
	2015
英文摘要	Holographic polymer dispersed liquid crystals (H-PDLCs) pertain to one type of intriguing switchable electro-optical device, and there is a constant need to quantitatively understand the photopolymerization kinetics and gelation process during the formation of H-PDLCs for the purpose of improving the diffraction efficiency and driving voltage. Herein, we quantitatively investigate the effect of the photoinitibitor composed of 3,3'-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with initiation and inhibition functions simultaneously generated under monochromatic illumination, on the formation of H-PDLCs. The outcomes reveal that an augmentation of KCD loading from 0.3 x 10(-3) to 1.4 x 10(-3) mol L-1 dramatically promotes the photopolymerization rate and monomer conversion. Reversely, a further increase in KCD content drastically depressesphotopolymerization. The numerical deduction shows that the kinetics complies with the classical photopolymerization kinetics characteristics in the full range of the KCD content. Counterintuitively, the gelation time almost keeps constant when the KCD content is less than 1.8 x 10(-3) mol L-1, and then is able to grow by more than 4 times when the KCD loading further increases. Ketyl radical inhibition, which subsequently results in shortened weight-average chain lengths and increased gel point conversions, is believed to account for the kinetics and exceptional gelation behaviors. H-PDLCs with a scaffolding morphology are formed, and with an augmentation of the KCD content, the segregation degree and diffraction efficiency significantly improve from zero to 64% and 78 +/- 11%, respectively, and then level off, allowing for the facile fabrication of glass-free colored 3D images; while the critical driving voltage gradually decreases from 8.9 +/- 1.0 to 4.6 +/- 0.7 V mu m(-1).
收录类别	SCI
原文出处	http://pubs.rsc.org/en/Content/ArticleLanding/2015/PY/C5PY01414J#!divAbstract
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/9170]
专题	深圳先进技术研究院_其他
作者单位	Polymer Chemistry
推荐引用方式 GB/T 7714	Peng, Haiyan,Chen, Guannan,Ni, Mingli,et al. Classical photopolymerization kinetics, exceptional gelation, and improved diffraction efficiency and driving voltage in scaffolding morphological H-PDLCs afforded using a photoinitibitor[J]. Polymer Chemistry,2015.
APA	Peng, Haiyan.,Chen, Guannan.,Ni, Mingli.,Yan, Yan.,Zhuang, Jiaqing.,...&Xie, Xiaolin.(2015).Classical photopolymerization kinetics, exceptional gelation, and improved diffraction efficiency and driving voltage in scaffolding morphological H-PDLCs afforded using a photoinitibitor.Polymer Chemistry.
MLA	Peng, Haiyan,et al."Classical photopolymerization kinetics, exceptional gelation, and improved diffraction efficiency and driving voltage in scaffolding morphological H-PDLCs afforded using a photoinitibitor".Polymer Chemistry (2015).