Dual Temperature- and pH-Dependent Self-Assembly of Cellulose-Based Copolymer with a Pair of Complementary Grafts

Dual Temperature- and pH-Dependent Self-Assembly of Cellulose-Based Copolymer with a Pair of Complementary Grafts

Thermo- and pH-responsive micellization of HEC-g-(PNiPAAm&PAA) (CNiPAa) was studied. This binary graft copolymer CNipAa was synthesized via successive radical polymerization of N-isopropylacrylamide (NiPAAm) and acrylic acid (AA) from hydroxyethyl cellulose (HEC) as the backbone. The copolymers...

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Veröffentlicht in:Macromolecules 2007-07, Vol.40 (15), p.5552-5558
Hauptverfasser: Wan, Shun, Jiang, Ming, Zhang, Guangzhao
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Applied sciences
Cellulose and derivatives
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
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Jiang, Ming
Zhang, Guangzhao
description Thermo- and pH-responsive micellization of HEC-g-(PNiPAAm&PAA) (CNiPAa) was studied. This binary graft copolymer CNipAa was synthesized via successive radical polymerization of N-isopropylacrylamide (NiPAAm) and acrylic acid (AA) from hydroxyethyl cellulose (HEC) as the backbone. The copolymers are able to self-assembly into a trinity of micelles of different structures by combined pH and temperature stimuli:  (1) at 30 °C and a low pH range (
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This binary graft copolymer CNipAa was synthesized via successive radical polymerization of N-isopropylacrylamide (NiPAAm) and acrylic acid (AA) from hydroxyethyl cellulose (HEC) as the backbone. The copolymers are able to self-assembly into a trinity of micelles of different structures by combined pH and temperature stimuli:  (1) at 30 °C and a low pH range (&lt;4.6), forming the micelles with a core of PAA/PNiPAAm due to hydrogen-bonding interaction between the two grafts; (2) in basic solution and at a temperature above the LCST of PNipAAm, hydrophobic aggregation of PNiPAAm grafts leading to PNiPAAm-core micelles with a compound shell of PAA/HEC; (3) forming a three-layer micellar structure due to the further response of the PNipAAm-core micelles to pH change. These three forms of micelles were examined by TEM, AFM, and DLS/SLS, and the corresponding forming mechanisms were clarified. 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subjects Applied sciences
Cellulose and derivatives
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
title Dual Temperature- and pH-Dependent Self-Assembly of Cellulose-Based Copolymer with a Pair of Complementary Grafts
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