Mechanical and physical properties of carbon nano tubes with kevlar fiber reinforced with polyester resin

In this research study Hardness (shore D), Water absorption,Flexural, Impact Test, and Fracture Toughness of polymer nanocomposites. The polymer nano composites based on unsaturatedpolyester resin reinforced with Kevlar fibers (K.F). The samples areattended by hand lay – up method according to (Rule mixture) forvarious volume fractions of unsaturated polyester resin, fiber andcarbon nanotube. The polyester resin was matrix strengthened with3% volume fraction from Kevlar fiber and (0.5%, 1%, 1.5%, 2%)volume fractions of carbon nanotube. The water absorption, hardness(shore D), flexural test, impact test and toughness fracture propertieswere studied. Results showed that the water absorption increase withvolume fraction increase of fiber with Carbon Nanotube, the sample(polyester+3%K.F+0.5% CNTs) has lower water absorption thanother samples. The hardness (shore D), flexural test, impact test andtoughness fracture for the sample (polyester+3%C.F+0.5% CNTs)has higher value for Nano- composites.

In this research study Hardness (shore D), Water absorption, Flexural, Impact Test, and Fracture Toughness of polymer nano composites. The polymer nano composites based on unsaturated polyester resin reinforced with Kevlar fibers (K.F). The samples are attended by hand lay -up method according to (Rule mixture) for various volume fractions of unsaturated polyester resin, fiber and carbon nanotube. The polyester resin was matrix strengthened with 3% volume fraction from Kevlar fiber and (0.5%, 1%, 1.5%, 2%) volume fractions of carbon nanotube. The water absorption, hardness (shore D), flexural test, impact test and toughness fracture properties were studied. Results showed that the water absorption increase with volume fraction increase of fiber with Carbon Nanotube, the sample (polyester+3%K.F+0.5% CNTs) has lower water absorption than other samples. The hardness (shore D), flexural test, impact test and toughness fracture for the sample (polyester+3%C.F+0.5% CNTs) has higher value for Nano-composites.

Introduction
Polymer nano composites, which is a new class of polymeric materials based on the reinforcement of polymers using nano fillers, have attracted a great deal of interest in fields ranging from basic science to the industrial applications because it is possible to remarkably improve the physical properties of composite materials at lower filler loading [1, 2]. These attempts include studies of the polymer nano composites with the introduction of nano reinforcing fillers such as carbon nanotube CNT, carbon nano fibers, inorganic nanoparticles, and polymer nanoparticles into the polymer matrix [1][2][3][4]. In particular, excellent mechanical strength, thermal conductivity, and electrical properties of CNT have created a high level of activity in materials research and development for potential applications such as fuel cell, hydrogen storage, field emission display, chemical or biological sensor, and advanced polymer nano composites [5,6]. This feature has motivated a number of attempts to fabricate CNT/polymer nano composites in the development of high-performance composite materials. In this regard, much research and development have been performed to date for achieving the practical realization of excellent properties of CNT for advanced polymer nano composites in a broad range of industrial applications. However, because of their high cost and limited availability, only a few practical applications in industrial field such as electronic and electric appliances have been realized to date [7]. There are many studies about composite materials.
The effect of addition (0.2, 0.5%wt) of multi-walled carbon nano tube to the polyester resin composite reinforced by glass fiber. The results show that the polyester resin containing higher than 0.5% wt MWCNTs was not able to impregnate completely the last layer of glass fiber mat due to increase in viscosity while the composite containing lower than 0.5% wt MWCNTs exhibited good mechanical properties. also can be found that the composite with 0.2 % wt was apparent better mechanical properties than composite with 0.5% wt MWCNTs [8].
The mechanical properties of multiwalled carbon nanotube reinforced epoxy resin at different fraction (0.2, 1)%wt. From the results can be seen that the viscosity of the epoxy resin increase with the increase of weight fraction of CNTs and this lead to increase dispersion of CNTs in the matrix [9].
Objectives of the research 1. Prepare nano composites of polyester resin reinforced with Kevlar fiber and carbon nanotube. 2. Study some physical and mechanical properties (water absorption, XRD, AFM, hardness shore D, impact test and flexural strength).

Experimental work
The materials used in the preparation of samples consist of Kevlar fibers (fabric 49), polyester resin as the matrix from the Faralop Company with a density of (1.11 gm / cm 3 ). Multi-walled carbon nanotube from (Intelligent Materials Pvt. Ltd, NANOSHEL LLC) [10]. The dimensions required of moulds for preparing the specimens were made from glass (120×120×5) mm. The mean grain size of carbon nanotube was (48) nm, as shown in Fig.1