کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10609339 984569 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Swelling behaviors, tensile properties and thermodynamic studies of water sorption of 2-hydroxyethyl methacrylate/epoxy methacrylate copolymeric hydrogels
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Swelling behaviors, tensile properties and thermodynamic studies of water sorption of 2-hydroxyethyl methacrylate/epoxy methacrylate copolymeric hydrogels
چکیده انگلیسی
A series of copolymeric hydrogels based on 2-hydroxyethyl methacrylate (HEMA) and epoxy methacrylate (EMA) were synthesized by bulk polymerization. Swelling behaviors and tensile properties of hydrogels were studied. Dynamic swelling behaviors of copolymeric hydrogels indicate that the swelling process of these polymers follows Fickian behavior. The equilibrium water content (EWC) decreased and volume fraction of polymer in hydrogel (ϕ2) increased with EMA content increasing due to its hydrophobicity. The increase of ionic strength of swelling medium or temperature results in a decrease in EWC and an increase in values of ϕ2. Young's modulus and tensile strength of hydrogels, as well as effective crosslink density (ve), increased as EMA content increased or ionic strength of swelling medium increased, attributing to increasing interaction between hydrophobic groups and polymer-polymer interaction with an increase in EMA content or in ionic strength. The polymer-solvent interaction parameter χ reflecting thermodynamic interaction was also studied. As EMA content, ionic strength of swelling medium or temperature increased, the values of χ increased. The values of χ and its two components χH and χS varied with increasing T. The negative values and trend of the enthalpy and entropy of dilution derived from values of χS and χH, could be explained on the basis of structuring of water through improved hydrogen bonding and hydrophobic interaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 41, Issue 5, May 2005, Pages 1143-1151
نویسندگان
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