Effects of Inclusion Complexation and Degree of  Protonation on Cloud Point of Poly(N-acryloyl-N′-propylpiperazine)

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (9): 2223.

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Effects of Inclusion Complexation and Degree of Protonation on Cloud Point of Poly(N-acryloyl-N′-propylpiperazine)

GUO Kai, SUN Liang, WU Meng-Chun, WANG Shao-Dan, WANG Li-Yan*

College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China

Received:2011-04-01 Revised:2011-06-01 Online:2011-09-10 Published:2011-08-11
Contact: WANG Li-Yan E-mail:wangliyan@vip.sina.com
Supported by:
国家自然科学基金(批准号: 21074047)和新世纪优秀人才支持计划(批准号: 07-0365)资助.

Abstract

Abstract: Poly (N-acryloyl-N'-propylpiperazine) (PAcrNPP) is a pH- and temperature-responsive homopolymer. Degree of protonation of PAcrNPP can be changed by adjusting pH of the solution. Cloud point of PAcrNPP increased with increasing degree of protonation. We investigated effects of different sizes of cyclodextrins (CD) on cloud point of PAcrNPP. It was found that α-CD showed a significant effect on cloud point of PAcrNPP while α-CD had almost no effect on its cloud point. At pH 9.0 and pH 7.4, we measured cloud points of PAcrNPP solutions containing different concentrations of α-CD. Cloud point of PAcrNPP solutions rises with increase of concentration of α-CD. Further more, we deduced an equation on the basis of contributions of different forms of PAcrNPP to cloud point. This equation describes the combined effect of complexation of CD and degree of protonation on cloud point from the viewpoint of chemical equilibrium.

Key words: Thermosensitive polymer, pH-sensitive polymer, α-Cyclodextrin, Cloud point, Inclusion complexation

CLC Number:

O631

TrendMD:

GUO Kai, SUN Liang, WU Meng-Chun, WANG Shao-Dan, WANG Li-Yan*. Effects of Inclusion Complexation and Degree of Protonation on Cloud Point of Poly(N-acryloyl-N′-propylpiperazine)[J]. Chem. J. Chinese Universities, 2011, 32(9): 2223.

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Effects of Inclusion Complexation and Degree of Protonation on Cloud Point of Poly(N-acryloyl-N′-propylpiperazine)

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