Nylon 66 microcomposites with various weight percentage of titanium dioxide (TiO 2 ) were prepared by a twin screw extruder and investigated for mechanical and tribological properties.Mechanical properties of the composite such as tensile strength/modulus, flexural strength/modulus, impact, and compressive strength first showed an increase up to 6 wt% TiO 2 followed by a decrease at higher filler loading. The value of heat deflection temperature increased with the increase in wt% of TiO 2 . Sliding wear tests were performed on pin-on-disk equipment under different loads, sliding velocity, and sliding distance combinations. It was found that micro-TiO 2 -Nylon 66 composite exhibited reduced wear and coefficient of friction up to 6 wt% TiO 2 .Micro-TiO 2 at 2 wt% was most effective in improving the tribological properties of plain nylon 66. The worn surfaces were examined by scanning electron microscopy to understand the wear mechanism. The optimal combination from 2 wt% to 6 wt% micro-TiO 2 -Nylon 66 can be used depending upon the application requiring improvement in tribological or mechanical properties, respectively.
Synchronous bilateral germ cell tumo (BGCT) of the testis is rare and its association with bilateral cryptorchidism is even rarer. We report one case of BGCT of testis with bilateral cryptorchidism who presented as blunt injury abdomen in emergencyand was not diagnosed preoperatively. Postoperatively after an appropriate diagnosis, he was managed with chemotherapy. In this report, we have reviewed the larger series of BGCT for the presentation and management of synchronous BGCT to derive some conclusions.
Composite of Nylon 66 with different proportions of microparticle Al2O3 were made by compounding on a twin screw extruder. The sliding wear and mechanical properties of the resulting microcomposite of 2 to 8 wt.% Nylon 66–Al2O3 were investigated. The study of sliding wear under different loads, velocity and sliding distance combinations was done using pin-on-disk equipment. The results show that wear rate reduces with addition of microparticles and lowest wear is exhibited by 2 wt.% Al2O3–Nylon 66 composite. The lowest friction coefficient is also observed for 2 wt.% Al2O3-Nylon 66 composite and the value increases with increasing load, sliding velocity and sliding distance. The mechanical properties such as flexural strength and modulus, tensile strength and modulus, compressive and impact strength improved with the addition of alumina and maximum values are observed for 6 wt.% composite. The heat deflection temperature of the microcomposite increased with increasing weight % of alumina. Scanning electron microscopy images of the worn surfaces were examined to understand the wear mechanism. The improved mechanical and tribological properties of Nylon 66–Al2O3 composite will enhance the application of plain Nylon 66.
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