کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9560430 | 1381986 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modulating effect of Mg-Al-CO3 layered double hydroxides on the thermal stability of PVC resin
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Mg-Al-CO3 layered double hydroxides (hydrotalcite-like materials) with different Mg/Al molar ratios and having small particle size and narrow size distribution have been prepared by a method involving separate nucleation and aging steps and characterized by XRD, FT-IR and TG-DTA, which clearly demonstrated that the charge density of the layers decreased with increasing Mg/Al molar ratio. Therefore, the electrostatic force of attraction between layers and interlayer counter-ions as well as the driving force for anion exchange decreased. Varying amounts of Mg-Al-CO3 layered double hydroxides with different Mg/Al molar ratio were mixed with PVC resin. Thermal aging tests of the resulting PVC composites were carried out in a thermal aging test box at 180±1 °C by observing the colour change of the samples. The results showed that Mg-Al-CO3 layered double hydroxide with Mg/Al=2 has the best stabilizing effect on PVC because of its higher layer charge density and consequent stronger driving force for uptake of Clâ in the interlayer galleries. Uptake of Clâ inhibits the autocatalytic dehydrochlorination of PVC which is responsible for its degradation. The optimum loading of layered double hydroxides was determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 88, Issue 2, May 2005, Pages 286-293
Journal: Polymer Degradation and Stability - Volume 88, Issue 2, May 2005, Pages 286-293
نویسندگان
Yan-Jun Lin, Dian-Qing Li, David G. Evans, Xue Duan,