کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188553 | 1381160 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface-active fluorocarbon end-functionalized polylactides
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The synthesis and surface properties of a 2 Ã C8F17 fluorocarbon di-functionalized poly(d,l-lactide), “F2PLA” are described. Small fractions â¼5% w/w of F2PLA, when blended with unfunctionalized poly(d,l-lactide), “PLA”, render the surface both hydrophobic and lipophobic. Contact angle analysis indicates that the properties of the blend surface approach those of PTFE. Rutherford backscattering analysis of the surface shows that at saturation, approximately 50% of the blend surface is covered by C8F17 fluorocarbon units. Using self-consistent field theory simulations, we estimate that adsorption of the F2PLA is characterized by a thermodynamic sticking energy of the difunctional group of approximately 6 kBT. Bilayer samples were prepared in which a blend of F2PLA in PLA was initially covered with a layer of pure PLA. The rate of surface modification in these films was analysed to obtain a diffusion coefficient of up to 160 nm2 sâ1 for 21.6 kg/mol F2PLA at 90 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 24, 8 November 2006, Pages 8116-8122
Journal: Polymer - Volume 47, Issue 24, 8 November 2006, Pages 8116-8122
نویسندگان
Lian R. Hutchings, Amilcar Pillay Narrainen, Stuart M. Eggleston, Nigel Clarke, Richard L. Thompson,