کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594234 | 1507519 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
13C solid state NMR investigation of structural relaxation of the polymer backbone in poly (ethylmethacrylate)
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: 13C solid state NMR investigation of structural relaxation of the polymer backbone in poly (ethylmethacrylate) 13C solid state NMR investigation of structural relaxation of the polymer backbone in poly (ethylmethacrylate)](/preview/png/9594234.png)
چکیده انگلیسی
Geometry and time scale of structural relaxation of poly(n-alkylmethacrylates) above the glass transition is studied by temperature dependent one- and two-dimensional 13C-NMR spectroscopy. The geometry of the isotropization of the polymer backbone as deduced from detailed analysis of spectral line shapes is identified as random angular jumps. Analysis of echo decays confirms that at a given temperature this isotropization can adequately be described with a single correlation time. The results are discussed in terms of conformational memory and local structure recently identified in these polymeric glasses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 27, Issues 1â2, January 2005, Pages 132-139
Journal: Solid State Nuclear Magnetic Resonance - Volume 27, Issues 1â2, January 2005, Pages 132-139
نویسندگان
Michael Wind, Lothar Brombacher, Andreas Heuer, Robert Graf, Hans Wolfgang Spiess,