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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 article, the viscoelas-tic behavior of composite solid propellants based on hydroxyl-terminated polybuta-diene (HTPB) was surveyed by dynamic mechanical analysis over a wide range of temperatures.
Abstract: Investigations have been ongoing to learn the rheological and/or mechanical behavior of composite solid propellants based on hydroxyl-terminated polybuta- diene (HTPB). The mechanical properties of these materials are related to the macromolecular structure of the binder as well as to the content and nature of the fillers. The viscoelas- tic behavior of an HTPB binder and its composites with different types of fillers was surveyed by dynamic mechan- ical analysis over a wide range of temperatures. This tech- nique has clearly demonstrated a two-phase morphology developed in these systems. The temperature location, in- tensity, and apparent activation energy of the distinct relax- ations are discussed. The dependency of the relaxation pro- cesses on filler content in a series of composites has eluci- dated the interactions between the filler particles and the existing hard- and soft-segment domains within the poly- urethane matrix. It was observed that the nature of the filler significantly affects the relaxation process associated with the hard-segment domains of the polymeric structure. © 2003
30 citations
TL;DR: In this article, wheat gluten (WG) was incorporated into polycaprolactone (PCL) as a filler to form a biodegradable polymer composite, and a microscopic examination showed a well-dispersed particle-matrix sys-tem.
Abstract: Wheat gluten (WG) was incorporated into polycaprolactone (PCL) (up to 50% w/w) as a filler to form a biodegradable polymer composite. A microscopic examination showed a well-dispersed particle-matrix sys- tem. The composite was evaluated for its tensile proper- ties. The tensile strength of the composite decreased line- arly with increasing WG content from 20 (0% WG) to 6 MPa (50% WG). However, the reduction of the tensile strength did not fit the Nicolais-Narkis model, and this indicated that some adhesion between WG and PCL occurred. High elongation (>900%) was observed in PCL- WG composites with up to 20% WG; it decreased to 400% with 35% WG and finally to less than 100% with 40-50% WG. There was a particle-induced transition at a calcu- lated critical volume of 0.3 corresponding to 30% WG by weight with respect to PCL. 2008 Wiley Periodicals, Inc.* J Appl Polym Sci 110: 2218-2226, 2008
30 citations
TL;DR: It is demonstrated that thermal cycling differently influences the flexural properties of composites reinforced with different sized silica-glass fibers.
30 citations
Cites background from "Mechanical Properties of Polymers a..."
...On the other hand the Tg of cross-linked PMMA is well above 100 ◦C [9]....
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...[9] Nielsen LE....
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...At temperatures above Tg the amorphous polymer becomes soft and flexible whereas at temperatures belowTg, thepolymer is in a rigid glassy state [9]....
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...Cross-linking also increases the glass transition of a polymer by introducing restrictions on the molecular motions of the chain [9]....
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...The glass transition temperature (Tg) is an importantmaterial characteristic of a polymer [9]....
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01 Jan 2017
TL;DR: In this article, the potential of dynamic mechanical thermal analysis is assessed by focusing on the ability of the technique to offer information not only on the viscoelastic performance of filled thermoplastic, thermosets, and elastomeric materials, but also on the miscibility and interface strengthening of polymer blends with nanoinclusions.
Abstract: The objective of this chapter is to establish the use of dynamic mechanical thermal analysis in characterizing polymer nanocomposites. Dynamic mechanical analysis is a powerful tool employed to comprehend thermal transitions of viscoelastic materials by characterizing the evolution of their macromolecular relaxation as a function of temperature and loading frequency. The presence of nanofillers perturbs the relaxation of the polymer chains affecting the stiffness, rigidity, and energy absorbing capability of polymeric materials. The modifications in the viscoelastic behavior of the polymers with the inclusion of nanofillers can be effectively studied from the storage/loss moduli and damping factor spectra obtained from this analysis. In this chapter, the potential of dynamic mechanical thermal analysis is assessed by focusing on the ability of the technique to offer information not only on the viscoelastic performance of filled thermoplastic, thermosets, and elastomeric materials, but also on the miscibility and interface strengthening of polymer blends with nanoinclusions. The various theoretical equations used for modeling dynamic mechanical properties of polymer nanocomposites are discussed in detail.
30 citations
TL;DR: In this paper, the effects of physical aging and temperature on the creep behavior of polymer blends and felt-filled plastics used to rehabilitate deteriorated sewer pipelines were investigated, with emphasis on characterizing the effects on the effect of physical ageing and temperature.
Abstract: This work presents an experimental investigation of creep behavior of polymer blends and felt-filled plastics used to rehabilitate deteriorated sewer pipelines, with emphasis on characterizing the effects of physical aging and temperature. The procedure for finding the aging shift rate μ is based on Struik's protocol and includes a novel method for rotating the data in addition to shifting. The master curve, obtained by Time Temperature Superposition (TTSP), of short-term data is shifted to the desired test temperature and initial age. A novel method is proposed to incorporate data from several specimens into a single averaged master curve and shift factor plot. Long-term behavior of the samples is predicted using the master curve and Effective Time Theory (ETT). The predicted long-term creep behavior is found to be close to the experimentally measured long-term creep behavior.
30 citations