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

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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. N,N′-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, τ 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 τ 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.

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Abbreviations

Py :

Pyranine

NIPA:

N-isopropylacrylamide

AAm:

Acrylamide

APS:

Ammonium persulfate

LCST:

Low critical phase transition temperature

DSC:

Differential scanning calorimetry

SEM:

Scanning electron microscopy

TEMED:

Tetramethylethylenediamine

D 0 :

Cooperative diffusion coefficients

τ 1 :

Swelling time constants

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Authors and Affiliations

  1. Department of Physics Engineering, İstanbul Technical University, 34469, Maslak-İstanbul, Turkey

    Gülşen Akin Evingür

  2. Kadir Has University, 34083, Cibali-İstanbul, Turkey

    Önder Pekcan

Authors
  1. Gülşen Akin Evingür
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  2. Önder Pekcan
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Correspondence to Önder Pekcan.

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Evingür, G.A., Pekcan, Ö. Effect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study. Polym. Bull. 68, 223–238 (2012). https://doi.org/10.1007/s00289-011-0625-6

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  • DOI: https://doi.org/10.1007/s00289-011-0625-6

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