Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their α-CD complexes

X. Hu; P. J. Zheng; X. Y. Zhao; L. Li; K. C. Tam; L. H. Gan

doi:10.1016/j.polymer.2004.05.072

Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their α-CD complexes

X. Hu^*, P. J. Zheng, X. Y. Zhao, L. Li, K. C. Tam, L. H. Gan

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

Novel azobenzene functionalized hydroxypropyl methylcellulose (AZO-HPMC) polymers and their α-CD (α-Cyclodextrin) complexes have been prepared. FT-IR, ¹H NMR and FT-Raman spectroscopy confirm the existence of azobenzene chromophores in AZO-HPMC polymers. α-CD can improve the water solubility of AZO-HPMC by formation of inclusion complexes with azobenzene side groups. Rheological studies substantiate that both AZO-HPMC and its α-CD complex undergo thermoreversible sol-gel transitions in aqueous solutions. Viscometric measurements suggest that the association between azobenzene side groups can be eliminated by α-CD. The effect of photoirradiation on the rheological behavior shows that the gelation temperature of AZO-HPMC increases after UV irradiation, while the gelation temperature of AZO-HPMC/α-CD complex decreases after UV irradiation.

Original language	English
Pages (from-to)	6219-6225
Number of pages	7
Journal	Polymer
Volume	45
Issue number	18
DOIs	https://doi.org/10.1016/j.polymer.2004.05.072
Publication status	Published - Aug 19 2004
Externally published	Yes

ASJC Scopus Subject Areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

Keywords

Azo polymers
Cyclodextrin
Rheology

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10.1016/j.polymer.2004.05.072

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@article{3a5d7ed8c75f4264843457caa931a7ac,

title = "Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their α-CD complexes",

abstract = "Novel azobenzene functionalized hydroxypropyl methylcellulose (AZO-HPMC) polymers and their α-CD (α-Cyclodextrin) complexes have been prepared. FT-IR, 1H NMR and FT-Raman spectroscopy confirm the existence of azobenzene chromophores in AZO-HPMC polymers. α-CD can improve the water solubility of AZO-HPMC by formation of inclusion complexes with azobenzene side groups. Rheological studies substantiate that both AZO-HPMC and its α-CD complex undergo thermoreversible sol-gel transitions in aqueous solutions. Viscometric measurements suggest that the association between azobenzene side groups can be eliminated by α-CD. The effect of photoirradiation on the rheological behavior shows that the gelation temperature of AZO-HPMC increases after UV irradiation, while the gelation temperature of AZO-HPMC/α-CD complex decreases after UV irradiation.",

keywords = "Azo polymers, Cyclodextrin, Rheology",

author = "X. Hu and Zheng, {P. J.} and Zhao, {X. Y.} and L. Li and Tam, {K. C.} and Gan, {L. H.}",

year = "2004",

month = aug,

day = "19",

doi = "10.1016/j.polymer.2004.05.072",

language = "English",

volume = "45",

pages = "6219--6225",

journal = "Polymer",

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T1 - Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their α-CD complexes

AU - Hu, X.

AU - Zheng, P. J.

AU - Zhao, X. Y.

AU - Li, L.

AU - Tam, K. C.

AU - Gan, L. H.

PY - 2004/8/19

Y1 - 2004/8/19

N2 - Novel azobenzene functionalized hydroxypropyl methylcellulose (AZO-HPMC) polymers and their α-CD (α-Cyclodextrin) complexes have been prepared. FT-IR, 1H NMR and FT-Raman spectroscopy confirm the existence of azobenzene chromophores in AZO-HPMC polymers. α-CD can improve the water solubility of AZO-HPMC by formation of inclusion complexes with azobenzene side groups. Rheological studies substantiate that both AZO-HPMC and its α-CD complex undergo thermoreversible sol-gel transitions in aqueous solutions. Viscometric measurements suggest that the association between azobenzene side groups can be eliminated by α-CD. The effect of photoirradiation on the rheological behavior shows that the gelation temperature of AZO-HPMC increases after UV irradiation, while the gelation temperature of AZO-HPMC/α-CD complex decreases after UV irradiation.

AB - Novel azobenzene functionalized hydroxypropyl methylcellulose (AZO-HPMC) polymers and their α-CD (α-Cyclodextrin) complexes have been prepared. FT-IR, 1H NMR and FT-Raman spectroscopy confirm the existence of azobenzene chromophores in AZO-HPMC polymers. α-CD can improve the water solubility of AZO-HPMC by formation of inclusion complexes with azobenzene side groups. Rheological studies substantiate that both AZO-HPMC and its α-CD complex undergo thermoreversible sol-gel transitions in aqueous solutions. Viscometric measurements suggest that the association between azobenzene side groups can be eliminated by α-CD. The effect of photoirradiation on the rheological behavior shows that the gelation temperature of AZO-HPMC increases after UV irradiation, while the gelation temperature of AZO-HPMC/α-CD complex decreases after UV irradiation.

KW - Azo polymers

KW - Cyclodextrin

KW - Rheology

UR - http://www.scopus.com/inward/record.url?scp=4143098460&partnerID=8YFLogxK

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DO - 10.1016/j.polymer.2004.05.072

M3 - Article

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SN - 0032-3861

VL - 45

SP - 6219

EP - 6225

JO - Polymer

JF - Polymer

IS - 18

ER -

Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their α-CD complexes

Abstract

ASJC Scopus Subject Areas

Keywords

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