Temperature-dependent desorption of surfactants in LLDPE blend films

Citation
K. Lee et al., Temperature-dependent desorption of surfactants in LLDPE blend films, J POL SC PP, 39(2), 2001, pp. 218-227
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN journal
0887-6266 → ACNP
Volume
39
Issue
2
Year of publication
2001
Pages
218 - 227
Database
ISI
SICI code
0887-6266(20010115)39:2<218:TDOSIL>2.0.ZU;2-O
Abstract
The temperature-dependent desorption behavior of surfactants in linear low- density polyethylene (LLDPE) blend films was studied with Fourier transform infrared spectroscopy at 25, 40, and 50 degreesC. The LLDPE/low-density po lyethylene blend was 70/30. Three different specimens (labeled II, III, and TV) were prepared with various compositions of the surfactant, sorbitan pa lmitate (SPAN-40), and the migration controller, poly(ethylene acrylic acid ) (EAA). The calculated diffusion coefficients of SPAN-40 in specimens II, III, and IV at 25, 40, and 50 degreesC varied from 9.6 x 10(-12) to 17.4 x 10(-12) cm(2)/s, from 5.5 x 10(-12) to 11.0 x 10(-12) cm(2)/s, and from 3.1 x 10(-12) to 5.8 x 10(-12) cm(2)/s, respectively. In addition, the activat ion energies of specimens II, III, and IV measured between 25 and 50 degree sC were 18.74, 19.42, and 20.14, respectively. Hence, the desorption rate o f the surfactant increased with the temperature and decreased with an addit ion of EAA, but the activation energy increased with EAA. The diffusion kin etics, analyzed with a plot of the integrated intensity ratio as a function of time, log(I-t/I-infinity) versus log t, at 25, 40, and 50 degreesC obey ed Fickian diffusion behavior. (C) 2000 John Wiley & Sons, Inc.