Real time monitoring of temperature variation and optical transmission during gelation of acrylamide (AAm) at various crosslinker contents
Küçük Resim Yok
Tarih
2004
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Free radical crosslinking copolymerization (FCC) of acrylamide (AAm) with various amounts of N,N'-methylenebis(acrylamide) (Bis) is performed at different onset temperatures (T,,,). Variation of temperature, T, and optical transmission, I-tr, are monitored in real time during the gelation process. The decrease in I-tr is modeled by the monomer consumption rate, and the gelation activation energies, DeltaE(G), are measured at each Bis content. During FCC, temperature increases to a certain level then decreases to its initial value as the gelation time increases, which is explained by the heat released during the polymerization process. Decrease in I-tr is attributed to the increase' in scattered light intensity, I-sc, during the formation of interconnected microgels in the system. It is observed that the number of microgels increases as the onset temperature, T-on, is increased. At a given temperature, high Bis content samples produce larger size of microgel particles compared to low Bis content samples.
Açıklama
Anahtar Kelimeler
Gelation Activation Energy, Microgels, Free Radical Crosslinking Copolymerization, Heat Release, Polyacrylamide Gels, Inhomogeneities, Microgels, Behavior
Kaynak
Composite Interfaces
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
11
Sayı
1
