PET polyester fibres are produced commonly in round crosssection, but fibres of special cross-section are now available from a number of manufacturers. PET polyester fibres are thermoplastic, and lend themselves well to physical modificationc associated with this property. Crimped and textured yarns of all familiar types are available. Production: Polyethylene terephthalate is made by the condensation of terephthalic acid, or a derivative such as dimethyl terephthalate, with ethylene glycol. Reaction a.
What are polymers? Polymers are long chains of molecules which can also be cross-linked, joining any other chains together. They are made from smaller molecules called monomers. Some examples of polymers are Jelly, rubber bands, plastic bags and chewing gum. Natural and synthetic polymers and their sources There are two different types of polymers know synthetic and natural.
CHAPTER 1 : INTRODUCTION 1.1 Introduction A fiber reinforced polymer (FRP) is a composite material consisting of a polymer matrix imbedded with high-strength fibers, such as glass, aramid and carbon. Generally, polymer can be classified into two classes, thermoplastics and thermosetting. Thermoplastic materials currently dominate, as matrices for biofibers; the most commonly used thermoplastics for this purpose are polypropylene (PP), polyethylene, and poly vinyl chloride (PVC); while phenolic, epoxy and polyester resins are the most commonly used thermosetting matrices. In the recent decades, fiber reinforced plastics are being more attractive in many engineering applications due to their higher mechanical properties compared to their low weight. The
CHAPTER 3 Project Description 3.1 THEORITICAL CONCEPTS ABOUT FIBER REINFORCED CONCRETE Concrete being a brittle building material and having low tensile strength is unfit to resist tension until duly reinforced. The concept of using fibers to reinforce building materials is not a nascent concept this method has been old and been run by intuition. Hoarse hairs and straws had been used in old times to prevent plaster material from cracking. More recently when Portland cement started evolving, attempts were made to enhance the properties of the cement by adding fibers. The concept of adding fibers to overcome the inherent behavior of concrete of showing brittle failure under tensile load.
Aramid reinforced polymer composites (ARPCs) 3. Glass fiber reinforcement composites (GFRs) **In each case the fiber is encased in a resin matrix (the continuous phase). **These matrices are usually acrylicepoxyphenolic or polyester resins. Reason for the selection: Because carbon fiber is light and able to increase the strength of the tennis rackets. Reinforcement had impact resistance, stiffness and tensile properties.
Sizes and shapes of components should consider pro¬duction and erection techniques. Concrete is a massive material. This is an advantage for such matters as stability under wind and seismic loads, thermal changes, vibration, and fire resistance. Maximum economy is achieved with maximum rep¬etition. Standard or repetitive sections should be used whenever possible.
Analysis of the Interfacial Properties of Polyethylene Self Reinforced Polymer Composite Dipin Raj D K , Joe Varghese Varghese , Nikhil K , Sharan Chandran M SMBS, VIT University Abstract — The composites having same matrix material and reinforcement material but manufactured by different methods is called Self Reinforced Polymer Composites (SRPC). They have comparable shear strength and tensile strength unlike other composites such as glass or carbon fiber reinforced composites. To understand the interfacial shear strength of self-reinforced composite an investigation is carried out by using Polyethylene self-reinforced composite. Polyethylene (PE) is a thermoplastic polymer which has a wide range of melting point temperatures due to stereochemistry. A higher melting point PE fabric is reinforced with a lower melting point PE matrix by a process called ‘Overheating’.
Use of glass fiber in reinforced concrete supply appreciable advantage. Earlier researchers with related corbel have achieved reinforced concrete in order that reinforced concrete, which contains only glass fiber as subordinate reinforcement have approximately the same load carrying capacity with also horizontal stirrups, which used against shear failure. Application of glass fiber assists the progress of the fabrication of the
It contains a large volume fraction (up to 70%) of strong fibers that are principle load-bearing constituent. Fibers are generally anisotropic and examples include carbon and aramids. • Particulate composites: Particulate composites consist of particles immersed in matrices such as alloys and ceramics. They are usually isotropic because the particles are added randomly. These types of composites contain particulate materials as the dispersed phase.
Polymer is large molecule formed from the merger of many small molecules known as monomer. The word polymer is derived from the Greek word Poly, which means “many” and Mer, which means “parts”. There are 2 types of polymer: natural polymer and synthetic polymer. The history of natural polymer goes back as long as man has been using wood, which composed of cellulose. Natural polymers exist in nature and can be extracted.