کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
202606 460611 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular dynamics and experimental study of conformation change of poly(N-isopropylacrylamide) hydrogels in water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Molecular dynamics and experimental study of conformation change of poly(N-isopropylacrylamide) hydrogels in water
چکیده انگلیسی

The conformation change of poly(N-isopropylacrylamide) (PNIPAAm) hydrogel as a function of temperature is studied both experimentally and by molecular simulation. The experiments show a Θ-temperature of approximately 305 K and a width of the transition region of approximately 20 K, independent of the amount of cross-linker. The conformation change of the hydrogel is caused by a conformation change of the single polymer chains in its backbone. The latter was studied by massively parallel molecular dynamics simulations with GROMACS 4. Different force fields for describing the hydrogel backbone (GROMOS-87, GROMOS-96 53A6 and OPLS-AA) as well as the water molecule (SPC/E and TIP4P) were investigated. In the simulations the mean radius of gyration of the polymer chains was monitored. Two force field combinations (GROMOS-96   53A6+TIP4PGROMOS-96   53A6+TIP4P and OPLS-AA+SPC/EOPLS-AA+SPC/E) yield the conformation change upon variation of the temperature. The results for OPLS-AA+SPC/EOPLS-AA+SPC/E are in fair agreement with the experimental results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 296, Issue 2, 25 September 2010, Pages 164–172
نویسندگان
, , , ,