کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5202704 1381907 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the action of ozone at high concentration on various grades of polyethylene and certain straight chain paraffins
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
On the action of ozone at high concentration on various grades of polyethylene and certain straight chain paraffins
چکیده انگلیسی
The surface functionalisation of UHMWPE (ultra high molecular weight polyethylene) was successfully achieved by the action of ozone (10% by weight in oxygen) under mild conditions. The kinetics of the gas-solid reaction between O3 and UHMWPE in powder form were measured in an IR gas cell and the pseudo-first-order rate constant was k′UHMWPE = 1.9 × 10−4 s−1. The resulting surface-oxidized UHMWPE was studied by FT-IR spectroscopy and the nature of the surface functionalities was determined. Furthermore, the surface-oxidized UHMWPE was studied by DSC (differential scanning calorimetry). It was evident that ozone attacks and oxidizes the amorphous phase of UHMWPE preserving the crystalline phase because after the ozone treatment there was an increase in the % of crystallinity. Two other polyethylene grades having respectively Mw = 15,000 Da (defined as LMWPE = low molecular weight polyethylene) and Mw = 4000 Da (defined as VLMWPE = very low molecular weight polyethylene) were studied as model compounds in comparison to UHMWPE in their reaction with ozone. Commercial liquid paraffin and n-dodecane were used as model compounds to study the reaction between high ozone concentration and alkanes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 96, Issue 5, May 2011, Pages 955-964
نویسندگان
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