کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
195511 459815 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In situ, high-pressure differential thermal analysis and ionic conductance of PMMA-based gels with and without TiO2 nano-particle filler
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
In situ, high-pressure differential thermal analysis and ionic conductance of PMMA-based gels with and without TiO2 nano-particle filler
چکیده انگلیسی

The transition behaviours of PMMA-based gels with and without nano-particle filler have been investigated at elevated pressures up to 0.9 GPa and in the temperature range 220–310 K. Both gels had molar ratios of 53.9:22:5.2:18.9 of ethylene carbonate (EC), propylene carbonate (PC), lithium perchlorate, PMMA, and one gel contained 8 wt.% TiO2 nano-particles. The results show a sluggish transition between a low-pressure (high temperature) state and a high-pressure (low temperature) state. The nano-particle filler facilitates the kinetics of the transition, yielding a significantly lower transition pressure as well as a better homogeneity in the sample after a transition back to the low-pressure state. These results can be explained by a filler-induced increase of the nucleation rate, which yields smaller crystallites. The transition is observed also by differential scanning calorimetry and Raman spectroscopy at ambient pressure and is likely associated with crystallization of the EC–PC solvent. The logarithmic pressure derivative of the conductance and, consequently, the activation volume changes a factor of 3 as a result of the transition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 21, 1 June 2006, Pages 4537–4543
نویسندگان
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