Influence of PCBM on the Glass Transition Temperature (T_g) of Poly(N-Vinylcarbazole)-Based Photorefractive Composite

Abstract:

2,5-dimethyl-(4-p-nitrophenylazo) phenetole (DMNPAPE) was synthesized. And its structure was confirmed with ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared (FT-IR) spectra and ¹H Nuclear Magnetic Resonance (¹H NMR) spectroscopy. The photorefractive composite consist of 33 wt % poly (N-vinycarbazole) (PVK), 50 wt % 2, 5-dimethyl-(4-p-nitrophenylazo) phenetole (DMNPAPE) and 16 wt % ethyl carbazole (ECZ) doped with x wt % (≤1 wt%) [6, 6]-phenyl C₆₁ butyric acid methyl ester (PCBM) was fabricated. The influence of PCBM on the glass transition temperature (T_g) of the photorefractive composite was studied using a differential scanning calorimetric (DSC) method. The active energy of glass transition (E_g) was evaluated by Kissinger’s and Moynihan’s relation. The analysis results indicate that the transition region shifts to higher temperatures with the increasing heating rate, and PCBM content (≤1.0 wt %) can influence T_g of PVK - based PR composite polymers. The T_g first increase and then went down with the PCBM content (below 1.0 wt %) increasing. The possible cause of the influence of PCBM on T_g was proposed.

• Periodical: Materials Science Forum (Volume 896)
• Pages: 62-71
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.896.62
• Online since: March 2017
• Authors: Bai Li Chen, Chuan Qun Huang, Rui Zhuang Yang, Yu Fang, Qing Jun Zhang, Xuan Luo, Ting Shao, Shu Fan Chen*
• Keywords: [6,6]-Phenyl C₆₁ Butyric Acid Methyl Ester (PCBM), Active Energy of Glass Transition (E_g), Differential Scanning Calorimetric (DSC), Glass Transition Temperature (T_g), PVK-Based Photorefractive Composite Polymers

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