کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1467581 990108 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Model systems for thermo-oxidised epoxy composite matrices
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Model systems for thermo-oxidised epoxy composite matrices
چکیده انگلیسی

This paper deals with the thermal oxidation of organic matrix composites, more precisely aromatic amine crosslinked epoxy resins (977-2 DGEBF-TGPAP-DDS) reinforced by carbon fibers. In this first part, it is tried to understand the effects of thermal oxidation on mechanical properties, emphasis being put on elastic and viscoelastic properties. It is shown that oxidation decreases the glass transition temperature, that results from predominant chain scission, but increases the glassy state elastic modulus. From quasi-static tensile testing, flexural and torsional dynamic testing (DMA) and ultrasonic measurement (5 MHz, 20 °C), it is shown that degradation affects essentially the amplitude of high temperature component of the sub-glass transition (internal antiplasticization). Model networks have been synthesized from amine and epoxy but in non-stoichiometric ratio. It is clearly shown that they display the same behaviour, that confirms the precedent interpretation. For the same crosslink density, the dangling chains concentration is higher in model than in degraded networks, but it remains of the same order of magnitude.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part A: Applied Science and Manufacturing - Volume 39, Issue 9, September 2008, Pages 1522–1529
نویسندگان
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