کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5187036 1381119 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Correlating the rheological and mechanical response of polyurethane nanocomposites containing hyperbranched polymers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Correlating the rheological and mechanical response of polyurethane nanocomposites containing hyperbranched polymers
چکیده انگلیسی

Cast polyurethane thermosets have been modified with randomly oriented exfoliated and intercalated montmorillonite clay using hyperbranched polymers (HBP) as reactive additives to promote dispersion of the clay platelets. The influence of the clay content on the stiffness of the nanocomposites is discussed in terms of simplified classical micromechanical models that allow correlations to be established between the properties of the final polyurethane and the limiting high strain rate shear viscosity of the HBP or HBP/polyethylene glycol nanocomposite precursors. Such models imply certain restrictions on the potential for mechanical reinforcement with unoriented platelets owing to crowding effects. Moreover, they appear unable to account simultaneously for the observed degrees of reinforcement in the glassy and the rubbery states, if currently accepted values for the stiffness of the MMT are assumed. Possible reasons for this are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 17, 8 August 2005, Pages 6543-6553
نویسندگان
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