Publication: Reversible film formation from nano-sized PNIPAM particles below glass transition
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Springer Science and Business Media LLC
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Abstract
Reversible film formation process from nano-sized Poly(N-isopropylacrylamide) (PNIPAM) microgel particles were studied during heating-cooling cycles at various rates. Photon transmission technique was used and transmitted photon intensity I tr was monitored during heating–cooling cycles. The increase and decrease in I tr during heating and cooling was explained with the void closure and void reconstruction processes, and the corresponding activation energies were measured. It was observed that PNIPAM microgels required less energy during reconstruction of voids than their closure.
Description
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Colloid and Polymer Science
ISSN
0303-402X
ISBN
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OPEN
Keywords
Ultraviolet radiation, [CHIM.POLY] Chemical Sciences/Polymers, Mathematical computing, Poly (N-isopropylacrylamide), Energy-transfer, Polymerization, Heating, Film formation, N-isopropylacrylamide gels, Molecular-weight, Photon transmission, [CHIM] Chemical Sciences, Poly(n-isopropylacrylamide) microgels, Activation energy, Nanotechnology, Volume phase-transition, Chemical analysis, Polystyrene, Phase transition, Priority journal, [CHIM.MATE] Chemical Sciences/Material chemistry, Microgels, Spectrometry, Thermal cycling, Transmitted photon intensity, Dispersion, Photon, Fracture, Spectrophotometry, Nanoparticles, T latex-particles, Film growth, Glass, Cooling, Glass transition, Temperature sensitivity, Gels