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A novel amphotropic polymer based on cellulose nanocrystals grafted with azo polymers |
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| Authors: | Qunxing Xu Xuefei Zhang Hailiang Zhang |
| Institution: | a School of Chemistry, Xiangtan University, Hunan Province, Xiangtan 411105, PR China b Key Laboratory of Low-Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Hunan Province, Xiangtan 411105, PR China c Key Laboratory of Environmentally-Friendly Chemistry and Applications of Ministry of Education, Hunan Province, Xiangtan 411105, PR China |
| Abstract: | A novel amphotropic polymer which could exhibit liquid-crystalline behavior both in the solvent and in the heating process was synthesized through azo polymers grafting from cellulose nanocrystals (CNCs). The CNCs, prepared by acid hydrolysis of filter paper, were characterized by Atomic Force Microscopy (AFM). Poly{6-4-(4-methoxyphenylazo)phenoxy] hexyl methacrylate}(PMMAZO), which was a liquid-crystalline polymers (LCP), was successfully to graft from CNC via Atom transfer radical polymerization (ATRP). The structure and thermal properties of the PMMAZO-grafted CNC were investigated using Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analyses (TGA). Its phase structures and transitions were studied by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The experimental results showed that the PMMAZO-grafted CNC exhibited both types of liquid crystal formation, thermotropic and lyotropic. |
| Keywords: | Atom transfer radical polymerization (ATRP) Amphotropic polymer Cellulose nanocrystal Azo polymers Liquid-crystalline polymers (LCP) |
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