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Time-resolved fluorescence anisotropy measurements in the study of poly(N-isopropyl acrylamide)-based systems ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
28604 44082 2006 8 PDF Available
Title
Time-resolved fluorescence anisotropy measurements in the study of poly(N-isopropyl acrylamide)-based systems ☆
Abstract

In this article we present recent data highlighting the power of (fluorescence) time-resolved anisotropy measurements (TRAMs) in the study of the thermoresponsive behaviour of poly(N-isopropylcrylamide), PNIPAM, and NIPAM-based systems. PNIPAM shows a lower critical solution temperature (LCST) at 32 °C when phase separation occurs as the macromolecule collapses into a globular structure. Manipulation of the conformational switch of PNIPAM results through changing the hydrophobic to hydrophilic balance within the polymer. However, although a degree of control of the LCST is possible through such a strategy, simple free radical copolymerisation serves to reduce the magnitude of the transition. Synthesis of graft copolymers based on NIPAM is offered as a solution to this problem: fine tuning of the thermal response results through control of the entropic term governing the thermodynamics of the process as revealed by TRAMs. Independent fluorescence labelling of both the backbone and the grafts allows the contribution of the chain dynamics from each of these sites to the thermal response to be monitored.

Keywords
Fluorescence; Time-resolved anisotropy measurements; Poly(N-isopropylacrylamide); Graft copolymers; Thermoresponsive; Conformational transition
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Time-resolved fluorescence anisotropy measurements in the study of poly(N-isopropyl acrylamide)-based systems ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 180, Issues 1–2, 15 May 2006, Pages 1–8
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us