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Polymer Composites

Papers and patents relating to polymer composites

Title: "Al-Cu-Fe quasicrystal/ultra-high molecular weight polyethylene composites as biomaterials for acetabular cup prosthetics"

Authors: B.C. Anderson, P.D. Bloom, K.G. Baikerikar, V.V. Sheares, and S.K. Mallapragada

Contact: V.V. Sheares

Journal: Biomaterials (2002) 23, 1761-1768.

Abstract:

Polymer composites of Al-Cu-Fe quasicrystals and ultra-high mol. wt. polyethylene (UHMWPE) were investigated for use in acetabular cup prosthetics. The wear properties of the Al-Cu-Fe/UHMWPE samples and a 440 steel ball counterface were measured. The mechanical strength of the Al-Cu-Fe/UHMWPE composites was compared to UHMWPE and alumina/UHMWPE. The biocompatibility of the composite material was tested using a direct contact cytotoxicity assay. Al-Cu-Fe/UHMWPE demonstrated lower volume loss after wear and higher mechanical strength than UHMWPE. This composite material also showed no increase in counterface wear or cytotoxicity relative to UHMWPE. These combined results demonstrate that Al-Cu-Fe/UHMWPE composites are promising candidate materials for acetabular cup prosthetics.

Title: "A novel polyamide 12/Al-Cu-Fe quasicrystal composite"

Authors: Y. Liu, P.D. Bloom, V.V. Sheares, and J.U. Otaigbe

Contact: V.V. Sheares

Journal: Mater. Res. Soc. Symp. Proc. (2002) 702, 339-344.

Abstract:

The tribological and mechanical properties of a novel polyamide 12 (PA12)/Al-Cu-Fe quasicrystal (QC) composite were systematically studied to accelerate efforts to develop a useful, melt-processable, and wear-resistant polymer composite. The wear and friction properties were characterized using a pin-on-disk configuration and the static and dynamic mech. properties were investigated using dynamical mechanical analyzer, tensile tester, and an impact tester. Further, the melt processability of the composite was studied using a Haake torque rheometer and a dynamic rotational rheometer. The results suggest that PA12/QC composite can be melt-processed into a wear-resistant material with enhanced mech. properties for applications where combinations of wear resistance and good mechanical properties are required. The static mechanical properties of the composite were found to be consistent with the Halpin-Tsai equation and agreement was observed between the measured viscoelastic properties and theoretical predictions of Burgers' and Eilers' models.

Title: "Novel poly(paraphenylene)s via nucleophilic aromatic substitution of poly(4'-fluoro-2,5-diphenylsulfone)"

Authors: P.D. Bloom and V.V. Sheares

Contact: V.V. Sheares

Journal: Macromolecules (2001) 34(6), 1627-1633.

Abstract:

Poly(4'-fluoro-2,5-diphenyl sulfone) was synthesized via Ni(0)-catalyzed coupling and was reacted with various nucleophiles via aromatic substitution (SNAr) to produce derivatized poly(paraphenylene) (PPP) thermoplastics and thermosets. Substitution by the nucleophiles was determined to be nearly quantitative by GPC and 1H NMR. The largest increase in the glass transition temperature relative to poly(4'-fluoro-2,5-diphenyl sulfone) was from 144 °C to 189 °C after displacement of fluoride with morpholine to give poly(4'-morpholino-2,5-diphenyl sulfone). Two graft copolymers were synthesized with low molecular weight poly(ethylene oxide) (PEO) and a poly(arylene ether ketone) (PAEK). The resulting PEO graft copolymer was soluble in water and in polar, aprotic solvents. The PAEK graft copolymer produced transparent, creasable PPP-based films that had 5% weight loss temperatures in nitrogen and air of 510 and 513 °C, respectively. Furthermore, a PPP epoxy cure agent was synthesized by the reaction of 4-aminophenol with poly(4'-fluoro-2,5-diphenyl sulfone). Finally, diethylenetriamine was reacted with poly(4'-fluoro-2,5-diphenyl sulfone) to produce a solvent resistant, cross-linked PPP film with a Tg of 240 °C.

Title: "Synthesis of poly[[1,1'-biphenyl]-4,4'-diyl[2,2,2-trifluoro-1=(trifluoromethyl) ethylidenel]] by nickel catalyzed coupling polymerization"

Authors: P.A. Havelka and V.V. Sheares

Contact: V.V. Sheares

Journal: Macromolecules, submitted (2000).

Abstract:

Unavailable

Title: "Novel polyimide-containing nanocomposites"

Authors: V. Tsukruk, P. Bloom, and V.V. Sheares

Contact: V.V. Sheares

Journal: Mater. Sci. Eng., A submitted (2000).

Abstract:

Unavailable

Title: "Development of Al-Cu-Fe quasicrystal-poly(p-phenylene sulfide) composites"

Authors: P.D. Bloom, K.G. Baikerikar, J.W. Anderegg, and V.V. Sheares

Contact: V.V. Sheares

Journal: Mat. Res. Soc. submitted (2000).

Abstract:

A new class of materials, polymer/quasicrystal composites with useful properties for beneficial exploitation in applications, such as dry bearings and composite gears, is reported. Preliminary results indicate that the new composites are a means of enhancing the properties of certain organic polymers while providing a new means of processing quasicrystals. Al-Cu-Fe quasicrystalline materials significantly improved wear resistance to volume loss in polymer-based composites. Furthermore, mechanical testing results showed a 2-fold increase in the storage modulus of the reinforced composites compared with the polymer samples. The fabrication in addition to the thermal, mechanical, and wear properties of these unique materials will be described.

Title: "Development of novel polymer/quasicrystal composite materials"

Authors: P.D. Bloom, K.G. Baikerikar, J.U. Otaigbe, and V.V. Sheares

Contact: V.V. Sheares

Journal: Mater. Sci. Eng., A (2000) 294-296, 156-159.

Abstract:

We report on a new class of materials, polymer/quasicrystal composites with useful properties for beneficial exploitation in applications, such as dry bearings and composite gears. Our preliminary results indicate that our new composites are a means of enhancing the properties of certain organic polymers while providing a new means of processing quasicrystals. Al–Cu–Fe quasicrystalline materials significantly improved wear resistance to volume loss in polymer-based composites. Furthermore, mechanical testing results showed a two-fold increase in the storage modulus of the reinforced composites compared with the polymer samples. The fabrication in addition to the thermal, mechanical, and wear properties of these unique materials will be described.

Title: "Fabrication and wear properties of quasicrystal/polymer composites"

Authors: V.V. Sheares and P.D. Bloom

Contact: V.V. Sheares

Journal: J. Mater. Chem., (in press).

Abstract: Unavailable.


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