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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 authors presented the preparation of nano-biphasic calcium phosphate (nBCP), mechanical behavior and load-bearing of poly (lactide-co-glycolide) (PLGA) and PLGA/NBCP are presented.
40 citations
Abstract: The increasing interest of academic and industrial sectors in the use of bio-based materials mirrors the overwhelming need for replacing, as much as possible, petroleum derived chemicals, reducing the negative environmental impact derived from their usage. Vegetable oils fulfill this goal extremely well, because of their worldwide availability, large volume production at comparatively low prices and versatility of the modifications and reactions in which they can participate to produce a large variety of different monomers and polymer precursors. Further reactions of these chemicals can lead to very different types of final materials with varied applications. It is because of this remarkable versatility that many review articles have appeared during the last few years; many of them have dealt with the various routes for vegetable oil modification and options for polymer synthesis, whilst others were dedicated to the analysis of the properties of the derived materials, generally focusing on structural properties. In this review, we focus on the capabilities of vegetable oils to be modified and/or reacted to obtain materials with functional properties suitable for use in coatings, conductive or insulating materials, biomedical, shape memory, self-healing and thermoreversible materials as well as other special functional applications. © 2015 Society of Chemical Industry
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TL;DR: In this paper, the synthesis and characterization of two new aromatic-aliphatic hyperbranched polyesters modified with long and short vinylic chains was reported, which were used as toughening modifiers of epoxy/anhydride thermosets.
Abstract: The synthesis and characterization of two new aromatic–aliphatic hyperbranched polyesters modified with long and short vinylic chains was reported. These hyperbranched polymers were used as toughening modifiers of epoxy/anhydride thermosets. The curing of mixtures of diglycidyl ether of bisphenol A and hexahydro-4-methylphtalic anhydride with different proportions of both hyperbranched polymers using N , N -benzyldimethylamine as catalyst was investigated by differential scanning calorimetry. The kinetic of curing process was established using an isoconversional integral procedure. The characterization of these materials was done by means of several thermal analysis techniques and their morphology was investigated by electron microscopy. The addition of highly branched structures led to homogeneous morphologies and a more toughening fracture of the thermosets in comparison to the neat epoxy/anhydride material. The modified thermosets presented slightly lower glass transition temperature than the unmodified one and the thermal stability barely changed by the addition of the modifiers.
40 citations
TL;DR: In this paper, the mechanical behavior of POSS-modified polyamide 6 (PA6), containing PA6 chains terminated at one end with aminopropyl-heptaisobutyl POSS, was investigated.
Abstract: This work investigated the mechanical behavior of POSS-modified polyamide 6 (PA6), containing PA6 chains terminated at one end with aminopropyl-heptaisobutyl POSS. Three systems with different POSS contents (5.4, 10.8, and 16.2 wt %), each characterized by a specific molecular mass, and the corresponding PA6 neat polymers were examined. The materials were first subjected to morphological and calorimetric analysis by wide-angle X-ray diffraction and differential scanning calorimetry, respectively. Tensile tests, performed on the samples in wet conditions, showed that stiffness, strength, and ductility were appreciably modified by the presence of POSS in the polymeric chains. The relationships among these effects and the microstructural characteristics of the systems also were analyzed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3409–3414, 2006
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TL;DR: In this paper, a potential bone replacement material, hydroxyapatite (HA) reinforced polypropylene (PP) composite (HA/PP), was made, with the HA volume percentage being up to 25% and the characteristics of the composite were studied using various techniques including scanning elec- tron microscopy (SEM), differential scanning calorimetry (DSC), tensile testing, microhardness testing, and dy- namic mechanical analysis (DMA).
Abstract: Composite biomaterials, which consist of a polymer matrix and a particulate bioactive phase and are hence analogous to bone microstructure, have been developed for human hard tissue substitution. In this investigation, a manufacturing route employing injection moulding was established for producing bone analogue biomaterials. Using this manufacturing technology, a potential bone replacement material, hydroxyapatite (HA) reinforced polypropylene (PP) composite (HA/PP), was made, with the HA volume percentage being up to 25%. The characteristics of the HA/PP composite were studied using various techniques including scanning elec- tron microscopy (SEM), differential scanning calorimetry (DSC), tensile testing, microhardness testing, and dy- namic mechanical analysis (DMA). It was demonstrated that with the use of the established manufacturing route, HA particles were well dispersed and homogeneously distributed in the PP matrix. Properties of the composite were affected by the amount of HA incorporated in the composite. The melting temperature and crystallisation temperature of the composite were slightly affected by the addition of HA particles, and the crystallinity of the PP matrix polymer was decreased with an increase in HA content. Young's modulus, microhardness, and stor- age modulus increased when the HA volume percentage was increased from 10 to 25%, with corresponding decreases in tensile strength, elongation at fracture and loss tangent. 2007 Wiley Periodicals, Inc. J Appl Polym Sci 106: 2780-2790, 2007
40 citations
Cites result from "Mechanical Properties of Polymers a..."
...This indicates that the addition of HA bioceramic stiffened HA/PP composite, which is in agreement with theories and the general observation that fillers having higher stiffness than the matrix can increase the elastic modulus of the composites.(1,29) Apart from bioactivity due to the presence of HA, the higher Young’s modulus the HA/PP composite is desirable for hard tissue replacement....
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