کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5191877 1381242 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Monte Carlo study of structure and kinetics of formation of end-linked polymer networks
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Monte Carlo study of structure and kinetics of formation of end-linked polymer networks
چکیده انگلیسی
The kinetics of formation and structural properties of end-linked polymer networks were studied by Monte Carlo simulations on a three-dimensional cubic lattice. Networks were generated from the solutions of linear polymer chains with functional end groups and tetrafunctional cross linkers. Systems of 10-, 20-mer precursor polymer chains with values of the ratio of cross linkers to polymer chains end groups r ranging from 0.9 to 1.4 were studied. Polymer volume fraction ϕ was varied from 0.1 to 0.5. Different ways of polymer network formation are possible, namely, gel creation process can proceed as homogeneous gelation as well as microgel separation. In addition to those limiting ways of polymerization process, intermediate cases were observed. All varied parameters (length of precursor polymer chains N, r and ϕ) influence the kinetics of the cross-linking. An algorithm to determine the soluble fraction in solution and the amount of loops and pendent structures in the polymer network was proposed. In agreement with experimental observations, simulations show that networks with lower soluble fractions which are more defect-free result from long precursor polymer chains (N=20) for approximately polymer melt densities (ϕ≈0.4) at higher than stoichiometric r values (r≈1.2).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 12, 26 May 2005, Pages 4248-4257
نویسندگان
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