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

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

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

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 285
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1007/s00396-006-1584-6
  • Dergi Adı: COLLOID AND POLYMER SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.423-430
  • Anahtar Kelimeler: film formation, nanoparticles, poly (N-isopropylacrylamide), microgels, N-ISOPROPYLACRYLAMIDE GELS, VOLUME PHASE-TRANSITION, T LATEX-PARTICLES, PHOTON TRANSMISSION, MOLECULAR-WEIGHT, POLY(N-ISOPROPYLACRYLAMIDE) MICROGELS, ENERGY-TRANSFER, POLYSTYRENE, DISPERSION, FRACTURE
  • Yıldız Teknik Üniversitesi Adresli: Evet

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.