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Mechanical Properties of Polymers and Composites
14 Dec 1993-
TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
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TL;DR: In this paper, a new membrane material with higher fractional free volume than Matrimid®, 6FDA/BPDA-DAM (1:1), was investigated for sub-ambient temperature (SAT) CO2 capture.
42 citations
TL;DR: A mechanical glass transition temperature was developed as the threshold of two distinct molecular processes governing the "rubber-to-glass" transformation ranging from the rubbery plateau and the transition region to the glassy state.
42 citations
TL;DR: In this article, the authors quantified the effect of high explosives on polymer matrix particulate composites by measuring four damage metrics; the change in compressive strength, modulus, thermal conductivity and porosity, with increasing impact strain.
Abstract: Polymer matrix particulate composites comprise the majority of solid-phase high explosives, and most show considerable deterioration in mechanical properties when damaged. We have quantified this effect in three RDX–HTPB composites by measuring four damage metrics; the change in compressive strength, modulus, thermal conductivity and porosity, with increasing impact strain (the causal metric). This approach was applied to three RDX–HTPB composites containing (a) coarse, (b) fine and (c) both coarse and fine particles. Damage was applied by compression to predetermined levels of strain at strain-rates of the order of 103 s−1. All three materials exhibited deterioration in strength and storage modulus, but only the composites containing coarse particles showed significant changes in porosity or thermal conductivity with increasing specific impact energy. This is because the fine-particle composites mask internal damage by recovering their initial form, the resultant cracks are closed, whereas the coarse particles underwent grain reorientation when impacted and are left open. This last point highlights the difference between active and passive assessments of damage since the former do not change the density or thermal conductivity of the material. The deterioration of secant modulus that results from damage can also be predicted using a simple energy-activation model.
41 citations
TL;DR: In this article, a microstereolithographic technique that enables the manufacturing of polymeric components for microelectromechanical systems is presented, where model microstructures are fabricated in the form of end-supported microbeams (10 μm in diameter).
Abstract: We present a microstereolithographic technique that enables the manufacturing of polymeric components for microelectromechanical systems. Model microstructures were fabricated in the form of end-supported microbeams (10 μm in diameter), in order to characterize the mechanical properties of the produced structures at the micron scale. The flexural modulus of these microbeams was measured by atomic force microscopy, using cantilevers with attached metal spheres, and employed in a three-point bending geometry. Postfabrication treatment of the microstructures allows for the tailoring of their stiffness.
41 citations
TL;DR: In this article, acrylic acid (AAc) was grafted onto a polypropylene backbone by a mechanochemical graft copolymerization reaction initiated by benzoyl peroxide (BPO) in a twin screw extruder.
41 citations