Reversible film formation from nano-sized PNIPAM particles below glass transition


Uğur Ş., Elaissari A., Yargı Ö. , Pekcan M. Ö.

COLLOID AND POLYMER SCIENCE, cilt.285, ss.423-430, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 285
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1007/s00396-006-1584-6
  • Dergi Adı: COLLOID AND POLYMER SCIENCE
  • Sayfa Sayıları: ss.423-430

Özet

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.