کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187355 | 1381127 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of narrow-distribution polycyclopentene using a ruthenium ring-opening metathesis initiator
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Polycyclopentene was synthesized by ring-opening metathesis polymerization (ROMP) at room temperature, using a ruthenium-based initiator in the presence of tricyclohexylphosphine, which acts as a polymerization regulator by shifting the metal-ligand binding equilibrium. A kinetic model was developed for the monomer conversion and polymer molecular weight as a function of time, monomer concentration, and monomer-to-initiator and phosphine-to-initiator ratios, and was fit to experimental data to extract a single rate parameter. By eliminating impurities which act as chain-transfer agents, and optimizing reaction conditions to minimize secondary metathesis, polycyclopentenes of controllable molecular weight (Mn = 6-40 kg/mol) and narrow distributions (PDI â 1.15) can be routinely obtained, which could be hydrogenated to perfectly linear polyethylenes. This work extends existing ROMP methods for the synthesis of precursors to narrow-distribution polyethylene, which have employed tungsten or molybdenum catalysts, to a commercially available, robust ruthenium initiator.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 49, Issue 4, 18 February 2008, Pages 877-882
Journal: Polymer - Volume 49, Issue 4, 18 February 2008, Pages 877-882
نویسندگان
Sasha B. Myers, Richard A. Register,