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24. Macromol. Chem. Phys. 11/2018

Author

Yan, Shijing, primary, Zhong, Zhenxin, additional, Li, Xiang-Dan, additional, Wen, Pushan, additional, Zhang, Haining, additional, Li, Lizhong, additional, He, Rui, additional, Zhang, Aiqing, additional, and Lee, Myong-Hoon, additional

Published
2018
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49. Photochromic and thermal properties of poly(vinyl alcohol)/H6P2W18O62 hybrid membranes

Author

Gong, Jian, Li, Xiang-Dan, Shao, Chang-Lu, Ding, Bin, Lee, Douk-Rae, and Kim, Hak-Yong

Subjects
*THIN films, *POLYVINYL alcohol, *PHOTOCHROMISM
Abstract

Poly(vinyl alcohol) (PVA) films, which contained different content of heteropolyacid (HPA) with Dawson–Wells structure, were prepared. The photochromic behavior was investigated by using ultraviolet–visible (UV-Vis) absorption spectroscopy. The result indicated that the film was reduced photochemically to yield a blue species under UV irradiation, and the color of the film changed to deep blue with increasing irradiation time and HPA content. The photochromic sensibility of different UV wavelength was investigated. In the UV-Vis spectra of the irradiated films, an isobestic point was observed at about 352 nm. The reduction mechanism of the heteropolyanion (W6+→W5+) was suggested. The thermal property and the conductivity of the film were also studied. The thermal degradation step and the melting point of the film were influenced by different content of the HPA. Notably, the conductivity of 8.33×10−6 S cm−1 was observed when the HPA content was 80 wt.%. [Copyright &y& Elsevier]

Published
2003
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50. Facile modifications of polyimide via chloromethylation: II. Synthesis and characterization of thermocurable transparent polyimide having methylene acrylate side groups

Author

Li, Xiang‐Dan, Zhong, Zhen‐Xin, Han, Sang‐Hoon, Lee, Seung Hee, and Lee, Myong‐Hoon

Abstract

From chloromethylated polyimide, a useful starting material for modification of aromatic polyimides, a thermocurable transparent polyimide having acrylate side groups was prepared. In the presence of 1,8‐diazabicyclo[5,4,0]undec‐7‐ene, chloromethylated polyimide was esterified with acrylic acid to synthesize poly(imide methylene acrylate). The polymer was soluble in organic solvent, which makes it possible to prepare a planar film by spin coating. The polymer film became insoluble after thermal treatment at 230 °C for 30 min. Optical transparency of the film at 400 nm (for 1 µm thickness) was higher than 98 % and not affected by further heating at 230 °C for 250 min. Adhesion properties measured by the ASTM D3359‐B method ranged from 4B to 5B. Preliminary results of planarization testing showed a high degree of planarization (DOP) value (>0.53). These properties demonstrate that poly(imide methylene acrylate) could be utilized as a thermocurable transparent material in fabricating display devices such as TFT‐LCD. Copyright © 2004 Society of Chemical Industry

Published
2005
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