Mechanical Properties of Polyester, Acrylic, Poly-amide
Fiber Reinforced Epoxy Composites

Composite materials are materials obtained by combining materials with two or more different properties that are used by people for thousands of years to solve problems without being aware of them. Polymer based composite materials have recently been developed to improve the properties of these materials, as they have many superior properties as well as insufficient strength. Depending on technological developments, different types of composites have been produced using different types of matrix and reinforcement. The purpose of this study is to produce and examine mechanical properties of polyester, acrylic and poly amide fiber reinforced epoxy composites. The composites were produced by the method of hand lay-up. Tensile, impact, flexural and interlinear shear strength (ILSS) tests were performed on the prepared specimens. Increases in the fiber content had various effects on the above mentioned mechanical properties of the obtained composites.

INTRODUCTION the polymers play very important role in our daily life. They can be combined with different materials to achieve special properties according to end use applications. Polymer based composites are being used more and more intensively in space, aviation, medicine, automotive, textile, construction, building and other developing technologies. Reinforcing fibers, which are generally used in polymer composites, provide strength and other desirable properties to the composite material. In parallel with these developments, work on fibers with better mechanical properties and higher heat resistant, non-cracking, high impact strength and hard polymer matrices continue in the world.

Today, most of the synthetic polymer fibers in use span applications such as clothing, carpets, ropes and reinforcement materials. Some of these fibers include poly amides such as nylon, polyesters (as PET, PBT), PP, PE, vinyl polymers (as PVA, PVC), PU and acrylic. Poly amide refers to family of polymers called linear poly amides made from petroleum. The generic name poly amide fiber has the same meaning as nylon fiber.

 Poly amides generally are tough, strong, durable fibers useful in a wide range of textile applications. The distinguishing characteristics are high elasticity, tear and abrasion free, low humidity absorption capability, fast drying, no loss of solidity in a wet condition, crease free, and rot and seawater proof. Application areas range from underwear to outdoor sports clothing, from automotive to aerospace. PET is the world’s most widely used fiber in a variety of forms. PET is widely used in both fiber and filament forms as a strong, dimension-ally stable fiber. Large quantities of PET fibers are also used for both woven and non woven fabrics used for industrial and technical applications. Polyester fibers have many excellent properties such as high strength, good stretch ability, durability and easy care characteristics. Acrylic fiber is named as acrylamide containing at least 85% of its chemical structure according to ISO (International Standards Organization) definition. Since acrylamide, which is predominantly homo polymerized with 100% acrylamide polymerization, is hard, brittle and difficult to paint, it has been converted into co polymers by the addition of a second monomer and is particularly suitably used in textiles. Acrylic fibers have a wide range of uses such as knitting, hand knitting, carpet, blankets, velvet, and socks. Also acrylic fiber has been extensively used in a number of industrial applications for example as a cursor for carbon fiber, as substitute for asbestos in-fiber reinforced cement, and in hot gas and wet filtration.

source:Marmara University, Department of Metallurgy and Materials Engineers