Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures

doi:10.1021/ma401665h

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	Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures
	Hore, Michael J. A.1; Hammouda, Boualem 1; Li, Yuyan 2; Cheng, He 2
刊名	MACROMOLECULES
	2013-10-08
卷号	46 期号:19 页码:7894-7901
ISSN号	0024-9297
DOI	10.1021/ma401665h
英文摘要	Small-angle neutron scattering was used to investigate poly(N-isopropylacrylamide) (PNIPAM) polymer solutions in d-water/d-ethanol mixtures. A wide poor-solvent region was observed for mixtures near 60% d-water/40% d-ethanol mixture. Spinodal lines were determined, permitting a mapping of the mixing/demixing regions of the phase diagram which comprises two main branches: the left branch (with mostly d-ethanol) where phase separation occurs upon cooling (UCST) and the right branch (with mostly d-water) where phase separation occurs upon heating (LCST). The ternary random phase approximation model was used to analyze SANS data. Three Flory-Huggins interaction parameters (PNIPAM/d-water, PNIPAM/d-ethanol and d-water/d-ethanol) were obtained. These display the reassuring 1/T behavior but show strong dependence on d-water/d-ethanol fraction. The conformation of polymer chains was determined by monitoring of the radius of gyration. Chains tend to swell with increasing temperature except close to the boundary of the left branch of the phase diagram (40% d-water) where they are observed to shrink.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000326355200035
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/54043]
专题	中国科学院化学研究所
通讯作者	Hore, Michael J. A.
作者单位	1.NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA 2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Hore, Michael J. A.,Hammouda, Boualem,Li, Yuyan,et al. Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures[J]. MACROMOLECULES,2013,46(19):7894-7901.
APA	Hore, Michael J. A.,Hammouda, Boualem,Li, Yuyan,&Cheng, He.(2013).Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures.MACROMOLECULES,46(19),7894-7901.
MLA	Hore, Michael J. A.,et al."Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures".MACROMOLECULES 46.19(2013):7894-7901.