کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1467145 990090 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isothermal cure characterization of fumed silica/epoxy nanocomposites: The glass transition temperature and conversion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Isothermal cure characterization of fumed silica/epoxy nanocomposites: The glass transition temperature and conversion
چکیده انگلیسی

The glass transition temperature (Tg) and conversion (α) were measured for a cycloaliphatic epoxy/anhydride system incorporated with different contents of hydrophobic fumed silica. Samples isothermally cured at varying cure temperatures and times were analyzed by differential scanning calorimetry (DSC). Tgvs. ln(time) data at an arbitrary reference temperature were superposed by time–temperature shifts to form a master curve for the kinetically controlled reaction, and the shift factors were used to calculate an Arrhenius activation energy. Influence of the hydrophobic fumed silica was investigated from Tg and α data. For low conversions, the incorporated fumed silica may reduce segmental mobility, giving rise to an increase in Tg. For high conversions, there was a significant depression of Tg which may be associated with the presence of residual hydroxyl groups on the surface of hydrophobic fumed silica. The positive and negative effects of the fumed silica on Tg and α are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part A: Applied Science and Manufacturing - Volume 41, Issue 4, April 2010, Pages 473–479
نویسندگان
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