Abstract
The fracture in dentures prepared from acrylic resin occurs frequently during the accidental damage or service through heavy occlusal force [1]. Impact failures usually occur out of the mouth as a result of accidental dropping due to cleaning, coughing or sneezing or a sudden blow to the denture [2]. This paper is focused on the effect of natural fibers on the mechanical properties of PMMA by changing two parameters (content of fibers and length of fibers). Fibers were treated with alkaline solution to improve the interfacial adhesion. Composite specimens were prepared by using hand lay-up method. The results were showed that the increasing the weight fraction of both fibers lead to increase compression strength and decrease impact strength of composite specimens. While, increasing fiber length of both fibers lead to decrease compression strength and increase impact strength of the composite specimens. The largest value obtained for bamboo specimens at (2mm) fiber length and (9wt. %) and reach (530 MPa.). The main goal of this research is studying the impact and compression properties of PMMA reinforced by natural fibers (siwak and bamboo) by varying length and concentration of both kinds of fibers.
Highlights
Increasing necessity for cost effective materials with relatively high strength to weight ratio, made researchers to study natural fibers
The results showed that the impact strength increase by increasing fraction of glass fiber and the highest value of impact strength found in weight fraction 5% [6]
The values of compression strength of pure PMMA specimens about (64.4 MPa) whiles the higher magnitude of compression strength of composite sample reinforced by bamboo and siwak fibers found at 9 wt. % and fiber length (2mm) reach (530 MPa & 310 MPa) respectively
Summary
Increasing necessity for cost effective materials with relatively high strength to weight ratio, made researchers to study natural fibers. Khalaf et al have study the effect of strengthening acrylic resin reinforced with siwak micro powder on the some mechanical properties of. Results showed that strengthening acrylic resin by (7 %) siwak powder have a considerable reduce in impact, compressive and tensile strength [7]. The result was showed that the polypropylene fiber improves the impact properties of acrylic base material and the higher value obtained at 10 wt. The results were showed that the magnitude of compression strength improved by adding particles. The results were showing that the flexural properties, impact strength and fracture toughness increased with increasing Content of particles and the highest values of obtaining for (PMMA:1% nono fly dust ) and maximum values of fracture toughness obtained for (PMMA:3%nano fly dust ) [10]
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