Study on critical behaviour in N-isopropyl acrylamide gels by using fluorescence technique
Yükleniyor...
Dosyalar
Tarih
2006-11
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Group
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The steady state fluorescence (SSF) technique was used to study the sol-gel transition for the solution free radical crosslinking copolymerization of N-isopropyl acrylamide (NIPA), with N,N'-methylenebis (acrylamide) (BIS) as crosslinker in the presence of ammonium persulfate (APS) as an initiator. Pyranine (8-hydroxypyrene-1,3,6-trisulfonic acid, trisodium salt, HPTS) was used as a floroprobe for monitoring the polymerization. Pyranine molecules start to bind to NIPA polymer chains upon the initiation of the polymerization, thus the spectra of the bonded pyranines shift to the shorter wavelengths. The get fraction exponent beta and the weight average degree of polymerization exponent gamma' agree best with the mean-field (Flory-Stockmayer) results near the gel point for various crosslinker contents.
Açıklama
Anahtar Kelimeler
Critical exponents, Pyranine, Fluorescence, Mean-field, Gel point, Volume-phase-transition, Molecular-size distribution, Glass-transition, Critical-point, Polymer gels, Percolation, Dynamics, Copolymerization, Fluorescence spectroscopy, Mean field theory, Sol-gel process, Floroprobes, Gel fraction exponents, Gel points, Polyacrylates
Kaynak
Phase Transitions
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
79
Sayı
1
Künye
Kaya Aktaş, D. & Pekcan, M. Ö. (2006). Study on critical behaviour in N -isopropyl acrylamide gels by using fluorescence technique. Phase Transitions, 79(11), 921-933. doi:10.1080/01411590600970728
