Effect of coupling agents on mechanical property of AN/PU energy Composite

ABSTRACT:Composites of high-density polyethylene (HDPE) filled with sintered and nonsintered hydroxyapatite (HA) powders, designated as HAs and HAns, respectively, were compounded by twin screw extrusion. Compounds with neoalkoxy titanate or zirconate coupling agents were also produced to improve interfacial interaction and filler dispersion in the composites. The composites were molded into tensile test bars using (i) conventional injection molding and (ii) shear-controlled orientation in injection molding (SCORIM). This latter molding technique was used to deliberately induce a strong anisotropic character to the composites. The mechanical characterization included tensile testing and microhardness measurements. The morphology of the moldings was studied by both polarized light microscopy and scanning electron microscopy, and the structure developed was assessed by wide-angle X-ray diffraction. The reinforcing effect of HA particles was found to depend on the molding technique employed. The higher mechanical performance of SCORIM processed composites results from the much higher orientation of the matrix and, to a lesser extent, from the superior degree of filler dispersion compared with conventional moldings. The strong anisotropy of the SCORIM moldings is associated with a clear laminated morphology developed during shear application stage. The titanate and the zirconate coupling agents caused significant variations in the tensile test behavior, but their influence was strongly dependent on the molding technique employed. The application of shear associated with the use of coupling agents promotes the disruption of the HA agglomerates and improves mechanical performance.

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Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Sousa

Reis

Cunha

et al. 2002

J of Applied Polymer Sci

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Evaluation of physico‐mechanical properties and in vitro biocompatibility of compression molded HDPE based biocomposites with HA/Al₂O₃ ceramic fillers and titanate coupling agents

Tripathi

Dubey

Basu

2011

J of Applied Polymer Sci

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The present article demonstrates how the stiffness, hardness as well as the cellular response of bioinert high-density polyethylene (HDPE) can be significantly improved with combined addition of both bioinert and bioactive ceramic fillers. For this purpose, different amounts of hydroxyapatite and alumina, limited to a total of 40 wt %, have been incorporated in HDPE matrix. An important step in composite fabrication was to select appropriate solvent and optimal addition of coupling agent (CA). In case of chemically coupled composites, 2% Titanium IV, 2-propanolato, tris iso-octadecanoato-O was used as a CA. All the hybrid composites, except monolithic HDPE, were fabri-cated under optimized compression molding condition (140 C, 0.75 h, 10 MPa pressure). The compression molded composites were characterized, using X-ray diffraction, Fourier transformed infrared spectroscopy, and scanning electron microscopy. Importantly, in vitro cell culture and cell viability study (MTT) using L929 fibroblast and SaOS2 osteoblast-like cells confirmed good cytocompatibility properties of the developed hybrid composites.

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Ammonium nitrate: a promising rocket propellant oxidizer

Oommen

Jain

1999

Journal of Hazardous Materials

256

167

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Effect of coupling agents on mechanical property of AN/PU energy Composite

Cited by 4 publications

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Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Evaluation of physico‐mechanical properties and in vitro biocompatibility of compression molded HDPE based biocomposites with HA/Al₂O₃ ceramic fillers and titanate coupling agents

Ammonium nitrate: a promising rocket propellant oxidizer

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Effect of coupling agents on mechanical property of AN/PU energy Composite

Cited by 4 publications

References 0 publications

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Evaluation of physico‐mechanical properties and in vitro biocompatibility of compression molded HDPE based biocomposites with HA/Al2O3 ceramic fillers and titanate coupling agents

Ammonium nitrate: a promising rocket propellant oxidizer

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Evaluation of physico‐mechanical properties and in vitro biocompatibility of compression molded HDPE based biocomposites with HA/Al₂O₃ ceramic fillers and titanate coupling agents