Film formation stages for poly(vinyl acetate) latex particles: a photon transmission study
Yükleniyor...
Dosyalar
Tarih
2006-07
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer-Verlag
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Photon transmission technique was used to monitor the evolution of transparency during film formation from poly(vinyl acetate) (PVAc) latex particles. The latex films were prepared below the glass transition temperature (T-g) of PVAc. These films were annealed at elevated temperatures in various time intervals above the T-g of PVAc. It is observed that transmitted photon intensity (I-tr) from these films increased as the annealing temperature is increased. It is seen from I (tr) curves that there are two film formation stages. These successive stages are named void closure (viscous flow) and interdiffusion. The activation energies for viscous flow (Delta H) and backbone motion (Delta E (b)) were obtained by using well-defined models. The averaged values of the backbone (Delta E (b)) and the viscous flow activation energies (Delta H) were found to be 188.6 and 5.6 kcal/mol, respectively. The minimum film formation (tau (M),T (M)) and healing points (tau (H),T (H)) were determined. Minimum film formation (Delta E (M)) and healing activation energies (Delta E (H)) were measured using these time-temperature pairs. Delta E (M) and Delta E (H) were found to be 32.5 and 28.3 kcal/mol, respectively.
Açıklama
Anahtar Kelimeler
Film formation, PVAc latex, Viscous flow, Interdiffusion, Activation energy, Molecular-weight, Interdiffusion processes, Temperature-dependence, Polystyrene particles, Polymer interfaces, Void closure, Diffusion, Fracture, Fluorescence, Coalescence, Annealing, Film growth, Glass transition, Interdiffusion (solids), Latexes, Particles (particulate matter), Photons, Temperature, Thermal effects, Latex, Polyvinyl acetate, Film coating, Glass transition temperature, High temperature procedures, Light intensity, Particle size, Polymerization, Priority journal, Time series analysis, Ultraviolet spectrophotometry, Viscosity, Latex particle, Photon intensity, Photon transmission, Polyvinyl acetates
Kaynak
Colloid and Polymer Science
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
284
Sayı
10
Künye
Kara, S., Pekcan, M. Ö., Saraç, A. & Arda, E. (2006). Film formation stages for poly(vinyl acetate) latex particles: A photon transmission study. Colloid and Polymer Science, 284(10), 1097-1105. doi:10.1007/s00396-006-1486-7
