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Effect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study

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Effect of LCST on the swelling of PAAm-NIPA copolymers a fluorescence study.pdf (357.2Kb)
Date
2012
Author
Evingür, Gülşen Akin
Pekcan, Önder
Abstract
Temperature sensitive copolymers were prepared by free radical crosslinking copolymerization in aqueous solution with different molar percentage of N-isopropylacrylamide (NIPA) and acrylamide (AAm) monomers. NN'-methylenebis (acrylamide) (BIS) and ammonium persulfate (APS) were used as a crosslinker and an initiator respectively. The steady-state fluorescence (SSF) technique was used to determine the low critical phase transition temperature (LCST) for PAAm-NIPA copolymers. Swelling experiments were performed in water at various temperatures by real time monitoring of pyranine (Py) fluorescence intensity I which decreased as swelling proceeded. The Stern-Volmer equation is modified for low quenching efficiencies to interpret the behavior of pyranine intensity during the swelling of PAAm-NIPA copolymers. The Li-Tanaka equation was used to determine the swelling time constants tau (1) and the cooperative diffusion coefficients D (0) from fluorescence intensity weight and volume variations of the copolymers at various temperatures. It was observed that tau (1) first increased up to LCST and then decreased
 
naturally D (0) decreased up to LCST and then increased upon increasing temperature. It was understood that (LCST) increases as PAAm contents increase in the PAAm-NIPA copolymers.
 

Source

Polymer Bulletin

Issue

1

Volume

68

Pages

223-238

URI

https://hdl.handle.net/20.500.12469/954
https://doi.org/10.1007/s00289-011-0625-6

Collections

  • Araştırma Çıktıları / Scopus [1482]
  • Araştırma Çıktıları / WOS [1407]
  • Biyoinformatik ve Genetik / Bioinformatics and Genetics [210]

Keywords

Swelling
Fluorescence
NIPA
Polyacrylamide
Copolymer
LCST

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