In situ monitoring of energy release in real time during gelation of acrylamide (AAm)
Küçük Resim Yok
Tarih
2001
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Temperature variation and optical transmission was monitored in real time during the free radical crosslinking copolymerization (FCC) of acrylamide (AAm) and N,N-1-methylenebis(acrylamide) (Bis). Gelation experiments were initiated at various onset temperatures (T-on). During gelation the temperature rose then decreased to its initial value as the gelation time increased. That is explained with the energy release (Gelation activation energy) during the polymerization process. Gelation activation energies, DeltaE(G) were measured and found to be increased as the onset temperature, T-on was increased. It was observed that transmitted photon intensities, I-sc, decreased dramatically at the reaction time, which were attributed to the increase in scattered light intensity, I-sc during the formation of interconnected microgels in the system. Increase in I-sc was modeled using Rayleigh's equation where reaction time was found to be proportional to the volume of the microgels. It was observed that a number of microgels increased as the onset temperature, T-on was increased. (C) 2001 Elsevier Science Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Gelation Activation Energy, Microgels, Photon Transmission Technique, Cross-Linker Contents, Polyacrylamide Gels, Inhomogeneities, Polymerization, Microgels, Hydrogels
Kaynak
Polymer
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
42
Sayı
17
