simulation microcapsules reinforced by carbon nanotubes contained in a capsule-based self-healing materials
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Simulation microcapsules reinforced by carbon nanotubes contained in a capsule-based self-healing materials
از آن جهت که مواد کامپوزیتی به خصوص کامپوزیت‌ها با زمینه پلیمری ساختارهای آسیب‌پذیری نسبت به صدمات ایجاد شده در فرم ترک و شکستگی هستند. در سال‌های اخیر تلاش‌های علمی جدید در جهت ایجاد یک واحد کنترل داخلی صورت گرفته است، تا بتواند به صورت خودمختار در ترمیم کامپوزیت‌ها عمل کند. نام این نظریه خودترمیمی است. نظریه خودترمیمی ناشی از همسان‌سازی بیولوژییکی، نشان می‌دهد؛ همان‌گونه که عمیق‌ترین زخم‌ها و...
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Double-walled polyurethane/poly(urea-formaldehyde) microcapsules (PU/UF) are prepared for use in self-healing materials. This modified encapsulation procedure combines two chemistries to form more robust capsule shell walls in a single operation. Robust capsules are formed by this procedure as long as the aromatic polyisocyanate prepolymer is soluble in the core liquid and the core liquid is co...
full textMicrocapsules filled with reactive solutions for self-healing materials
Microcapsules containing a solvent and reactive epoxy resin are a critical component for the development of cost-effective, low toxicity, and low flammability self-healing materials. We report a robust in situ encapsulation method for protection of a variety of oil soluble solvents and reactive epoxy resins surrounded by a thin, polymeric, urea–formaldehyde (UF) shell. Resin–solvent capsules ar...
full textPolydimethylsiloxane-Based Self-Healing Materials
Self-healing represents a new paradigm for active and responsive materials. As first demonstrated by White et al., and subsequently in additional publications, polymer composites can be engineered to chemically self-heal. However, the chemistry of previous systems possesses inherent shortcomings due to the potential side reactions with the polymer matrix and air. Here we present a new, chemical...
full textAnalytical model for effects of capsule shape on the healing efficiency in self-healing materials
The fundamental requirement for the autonomous capsule-based self-healing process to work is that cracks need to reach the capsules and break them such that the healing agent can be released. Ignoring all other aspects, the amount of healing agents released into the crack is essential to obtain a good healing. Meanwhile, from the perspective of the capsule shapes, spherical or elongated capsule...
full textElectromechanical response of single-walled carbon nanotubes to torsional strain in a self-contained device.
Nanoscale electronics seeks to decrease the critical dimension of devices in order to improve performance while reducing power consumption. Single-walled carbon nanotubes fit well with this strategy because, in addition to their molecular size, they demonstrate a number of unique electronic, mechanical and electromechanical properties. In particular, theory predicts that strain can have a large...
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Journal title:
فصلنامه علمی پژوهشی مهندسی مکانیک جامدات واحد خمینی شهرجلد ۹، شماره ۳، صفحات ۴۹۱-۵۰۸
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