Liquid Crystalline Phase and Gel-Sol Transitions for Concentrated Microcrystalline Cellulose (MCC)/1-Ethyl-3-methylimidazolium Acetate (EMIMAc) Solutions

doi:10.1021/bm101426p

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	Liquid Crystalline Phase and Gel-Sol Transitions for Concentrated Microcrystalline Cellulose (MCC)/1-Ethyl-3-methylimidazolium Acetate (EMIMAc) Solutions
	Song, Hongzan 2; Niu, Yanhua 2; Wang, Zhigang 1; Zhang, Jun 2
刊名	BIOMACROMOLECULES
	2011-04-01
卷号	12 期号:4 页码:1087-1096
ISSN号	1525-7797
DOI	10.1021/bm101426p
英文摘要	Liquid crystalline (LC) phase transition and gel-sol transition in the solutions of microcrystalline cellulose (MCC) and ionic liquid (1-ethyl-3-methylimidazolium acetate, EMIMAc) have been investigated through a combination of polarized optical microscope (POM) observation and rheological measurements. Molecular LC phase forms at the 10 wt % cellulose concentration, as observed by POM, whereas the critical gel point is 12.5 wt % by rheological measurements according to the Winter and Chambon theory, for which the loss tangent, tan delta, shows frequency independence. Dramatic decreases of G' and G '' in the phase transition temperature range during temperature sweep are observed due to disassembling of the LC domain junctions. The phase diagram describing the LC phase and gel-sol transitions is obtained and the associated mechanisms are elucidated. A significant feature shown in the phase diagram is the presence of a narrow lyotropic LC solution region, which potentially has a great importance for the cellulose fiber wet spinning.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000289223500028
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/72779]
专题	中国科学院化学研究所
通讯作者	Wang, Zhigang
作者单位	1.Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei Natl Lab Phys Sci Microscale, CAS Key Lab Soft Matter Chem, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Song, Hongzan,Niu, Yanhua,Wang, Zhigang,et al. Liquid Crystalline Phase and Gel-Sol Transitions for Concentrated Microcrystalline Cellulose (MCC)/1-Ethyl-3-methylimidazolium Acetate (EMIMAc) Solutions[J]. BIOMACROMOLECULES,2011,12(4):1087-1096.
APA	Song, Hongzan,Niu, Yanhua,Wang, Zhigang,&Zhang, Jun.(2011).Liquid Crystalline Phase and Gel-Sol Transitions for Concentrated Microcrystalline Cellulose (MCC)/1-Ethyl-3-methylimidazolium Acetate (EMIMAc) Solutions.BIOMACROMOLECULES,12(4),1087-1096.
MLA	Song, Hongzan,et al."Liquid Crystalline Phase and Gel-Sol Transitions for Concentrated Microcrystalline Cellulose (MCC)/1-Ethyl-3-methylimidazolium Acetate (EMIMAc) Solutions".BIOMACROMOLECULES 12.4(2011):1087-1096.