کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1394869 1501364 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene
ترجمه فارسی عنوان
اثر درج پوشش های هسته شکل گرفته در محل بر خواص مکانیکی و شکست پلی پروپیلن
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی


• Control of the RCSS inclusion composition was achieved in a single step process.
• Composition of RCSS inclusions capable of fibrillating at the crack tip in iPP was found.
• Fibrillating RCSS inclusions enhance stiffness and impact fracture toughness of iPP simultaneously.

To obviate the reduction of stiffness in rubber toughened and yield strength in rigid particle toughened iPP, various strategies were adopted. Here, we report on the static and impact properties of isotactic polypropylene (iPP) with in situ formed (rigid thermotropic liquid crystalline core)–(soft copolymer shell) inclusions (RCSS inclusions). We found that, at constant soft shell thickness (ts) and stiffness (Es), the elastic modulus of iPP/RCSS (Ec) increased with the total RCSS volume fraction (vRCSS), and, at constant vRCSS, the Ec increased with Es. At constant ts and Es, the yield strength of iPP/RCSS (σyc) decreased with the vRCSS and, at constant vRCSS and ts, the σyc decreased with Es in an agreement with the simple micromechanics models of Matonis and Small. At small vRCSS, the changes in Ec and σyc with vRCSS contributed simultaneously to the significant enlargement of the crack tip plastic zone size, enhancing the impact fracture toughness in terms of the apparent critical strain energy release rate (Gc′), substantially, without significantly reducing stiffness and yield strength. The SEM fractography revealed extension of the RCSS inclusions into fibrous shape providing an additional means for dissipation of mechanical energy stored in the fracturing solid. Experimental data agreed reasonably well with the prediction based on a simple mixed mode fracture model proposed earlier.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 71, October 2015, Pages 221–230
نویسندگان
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