Small molecule desorption prior to dissolution of a polymeric glass
Yükleniyor...
Dosyalar
Tarih
2006-07-15
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley Subscription Services, Inc., A Wiley Company
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Poly(methyl methacrylate) (PMMA) discs in various molecular weights (M-w) were prepared by free-radical polymerization. Pyrene (Py) was introduced during polymerization as a fluorescence probe. In situ steady state fluorescence experiments were performed to monitor desorption processes in chloroform solvent. When the PMMA discs were in chloroform, desorption of Py molecules were monitored by observing the change of Py fluorescence intensity I-P. To understand the mechanism of desorption, two different experiments were carried out in the meantime. In the first experiment, the weight of swelling and dissolving PMMA discs against dissolution time was monitored. The parallel experiment was conducted by measuring fluorescence intensity I-P from the desorbing Py molecules. Then, a set of desorption experiments were performed by monitoring I-P for various discs with different molecular weight of PMMA. A Fickian diffusion model was employed to quantify the fluorescence data produced from the swelling PMMA discs to measure desorption coefficients D-d. The measured D-d values decrease as the molecular weight of PMMA is increased in the swelling glass.
Açıklama
Anahtar Kelimeler
Desorption, Fluorescence, Polymer glass, Dissolution, Fluorescence technique, Films, Pyrene, Diffusion, Models, Free radical polymerization, Mathematical models, Swelling, Molecular weight, Polymerization, Polymethyl methacrylate, Solvent, Dissolution time, Fluorescence intensity, Fluorescence probes, Polymeric glass
Kaynak
Journal of Applied Polymer Science
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
101
Sayı
2
Künye
Pekcan, M. Ö. & Uğur, Ş. (2006). Small molecule desorption prior to dissolution of a polymeric glass. Journal of Applied Polymer Science, 101(2), 908-912. doi:10.1002/app.23980
