期刊
CELLULOSE
卷 16, 期 6, 页码 989-997出版社
SPRINGER
DOI: 10.1007/s10570-009-9350-9
关键词
Cellulose nanocrystals (CNC); Poly(N,N-dimethylaminoethyl methacrylate); Thermosensitive polymer; Chiral nematic phase; Liquid crystals
资金
- New Century Excellent Talents in University [NCET-050707]
- Scientific Research Fund of Hunan Provincial Education Department [06A068]
- Ministry of Education of China [207075]
- National Nature Science Foundation of China [20874082]
- Ministry of Education [KF0611]
Temperature-induced copolymers of poly(N,N-dimethylaminoethyl methacrylate)-grafted cellulose nanocrystals (PDMAEMA-grafted CNC) were synthesized by surface-initiated atom transfer radical polymerization (ATRP). The graft copolymers were characterized by thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC). The size of the original CNC was 10-40 nm in width and 100-400 nm in length, as characterized by atomic force microscopy (AFM). The liquid-crystalline properties of the graft copolymers were investigated by using polarizing optical microscopy (POM). The graft copolymers exhibited fingerprint texture in lyotropic state. The temperature-induced fingerprint texture changes of PDMAEMA-grafted CNC aqueous suspensions were investigated at various temperatures. With increasing temperature, the spacing of the fingerprint lines decreases. Temperature-induced changes of PDMAEMA polymer chains result in changes of fingerprint texture.
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