Preparation of bamboo fiber polymer composite by Vacuum Injection Molding technique and some properties of composite material

This paper presents the result of research on equipment development of vacuum injection molding technique for preparation the chopped bamboo fiber polymer composite and some properties of obtained composite material. For the vacuum injection molding technique, firstly the dry fibers were plated in the mold. Then the mold was closed by the vacuum bag, the air inside the mold was sucked out by a vacuum pump, due to the difference of the pressure in side and outside the mold, the polymer liquid was transferred to the closed mold and impregnated the bamboo fiber. The polymer used in this research was unsaturated polyester and epoxy resin. The obtained composite materials were evaluated by measuring some mechanical properties, such as tensile strength, compressive strength, and flexural strength according to ASTM standards.
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Preparation of bamboo fiber polymer composite by Vacuum Injection Molding technique and some properties of composite material Journal of Chemistry, Vol. 45 (5A), P. 214 - 220, 2007 Preparation of bamboo fiber polymer composite by Vacuum Injection Molding technique and some properties of composite material Received 16 August 2007 Nguyen Hoang An1, Ta thi Phuong Hoa2, Bui Chuong2 1 International Training Institute for Materials Science 2 Polymer Centre, Hanoi University of Technology summary This paper presents the result of research on equipment development of vacuum injection molding technique for preparation the chopped bamboo fiber polymer composite and some properties of obtained composite material. For the vacuum injection molding technique, firstly the dry fibers were plated in the mold. Then the mold was closed by the vacuum bag, the air inside the mold was sucked out by a vacuum pump, due to the difference of the pressure in side and outside the mold, the polymer liquid was transferred to the closed mold and impregnated the bamboo fiber. The polymer used in this research was unsaturated polyester and epoxy resin. The obtained composite materials were evaluated by measuring some mechanical properties, such as tensile strength, compressive strength, and flexural strength according to ASTM standards. I - Introduction the abundance of low cost, bamboo fibers in Vietnam make these fibers very attractive for Man-made fibers (such as glass fibers and application in composites. carbon fibers) are widely used as reinforcing Some commercially important fiber sources materials in fiber reinforced plastics. Although are present in table 2 [2], which show an annual these materials have high mechanical properties, large amount of bamboo to be supplied in to the drawbacks consist of the high costs, the fact that world. This research expects good possibilities they are non-degradable and that they can cause for the use of bamboo fibers in fiber reinforced skin irritation during processing. Natural fibers composites. (jute, flax, sisal, hemp, bamboo etc.) show many Beside the research on the natural fiber, in advantages. They have a low density, are from a order to limit the effect of man-made fibers and renewable resource, cause no skin irritation and the organic substance on the human and have low costs. At present, the research on environment and improve the property of natural fiber reinforced plastics has attracted composite material, the research on the new many scientists [1, 3, 4]. preparation technique is also concerned. Some Properties of some common natural fibers closed molding techniques have been developed are presented in table 1. They show that the such as Resin Transfer Molding (RTM), density of bamboo fibers is much lower than of Vacuum Injection Molding (VIM)…. In this other fibers. The specific mechanical properties research, the VIM technique was developed to (properties per unit weight) in combination with prepare the polymer composite. 214  Table 1: Physical properties of some natural fibres [1, 2] Specific Tensile E Specific tensile Specific Elongation gravity, strength, modulus, strength, stiffness, at failure, % g/cm3 MPa GPa MPa/g/cm3 GPa/g/cm3 Bamboo 0.8 400 15 9 500 19 Flax 1.5 780 70 1.40 520 47 Hemp 1.48 690 70 1.60 466 47 Jute 1.46 550 20 1.80 377 14 Sisal 580 38 2.50 Ramie 1.5 870 44 2.00 580 29 Glass 2.58 2400 73 3 930 28 Steel ...