MADIX Thermoresponsive Amphiphilic Block Copolymers as Stimulable Emulsion Stabilizers

2009 ◽  
Vol 62 (11) ◽  
pp. 1488 ◽  
Author(s):  
Mathias Destarac ◽  
Aurélie Papon ◽  
Eric Van Gramberen ◽  
Katerina Karagianni
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Cloud Point ◽  
Silicone Oil ◽  
Amphiphilic Block Copolymers ◽  
Solution Temperature ◽  
Water Emulsion ◽  
Critical Solution Temperature ◽  
Oil In Water ◽  
Oil In Water Emulsion

A series of Macromolecular Design by Interchange of Xanthates (MADIX)-derived amphiphilic block copolymers exhibiting lower critical solution temperature behaviour was synthesized and evaluated as silicone oil-in-water emulsion co-stabilizers. It was demonstrated that the cloud point of the block copolymer is mainly controlled by the chemical composition of the N-isopropylacrylamide-based hydrophilic block. The reversible stabilization and destabilization phenomena of the silicone emulsions occurred at a temperature equal to the cloud point of the block copolymer taken alone.

Synthesis and Property of Photo- and Temperature- Dual-Responsive Amphiphilic Block Copolymers

2009 ◽  
Vol 87-88 ◽  
pp. 47-51
Author(s):  
Xin De Tang ◽  
Nian Feng Han ◽  
De Jie Zhou
Keyword(s):  
Block Copolymers ◽  
Ethylene Glycol ◽  
Drug Carrier ◽  
Amphiphilic Block Copolymers ◽  
Solution Temperature ◽  
Poly Ethylene Glycol ◽  
Critical Solution Temperature ◽  
Dual Responsive ◽  
Hexyl Methacrylate ◽  
Poly Ethylene

Photo- and temperature-responsive amphiphilic block copolymers, poly(ethylene glycol)-b-poly{(N-isopropylacrylamide-co-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate), denoed as PEO-b-P(NIPAM-co-MAZO), were designed and synthesized by atom transfer radical polymerization (ATRP). The macroinitiator based on poly(ethylene glycol) (PEG, Mn = 2000 Da) was utilized to initiate the copolymerization of N-isopropylacrylamide (NIPAM) and 6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate (MAZO). The resultant copolymers, combining photo-responsive moieties with thermal-responsive moieties, possess photo- and temperature- dual-responsive property, among of which, PNIPAM shows lower critical solution temperature (LCST) and PMAZO exhibits reversible trans-cis isomerization under UV/vis irradiation. In selective solution they can form selective micro-tunnel with excellent controlled release, and can be used as drug carrier and controllable membrane.

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