(n.d.). Retrieved April 17, 2016, from http://www.slideshare.net/ ripestone_ho/polymers-and-their-properties INTERESTING facts about Isotactic Polypropylene Polypropylene is a versatile thermoplastic polymer. It can be moulded into different shapes and sizes and hence, can be put to many uses (material used to make chairs, containers, tools etc.) It is hard but flexible. (semi-rigid) It is lightweight!
Besides that, it is uncomplicated processing due to it has uncomplicated crosslinking requirement. The cost of polyester is also low in price. Polyester is durable, it can stretch, making it hard to tear. On the other hand, the material tends to be shiny, which is not always a desired characteristic. The color of polyester does not fade quickly in the sun.
After the improvement of natural polymers, efforts began to produce synthetic polymers. In the year 1909, first synthetic polymer known by the name Bakelite was prepared. After which another polymer was synthesized known as rayon in the year 1911. Since then polymers started to gain attention in the world. Another scientist Herman Staudinger described polymers in a new fashion by defining them as high molecular mass substances that are made up of subunits bonded covalently in the year 1919.
Engineering Chemistry Digital Assignment 3 - Polymers Name: Prasannakumar Krishnaraj Class: SJT 504 Reg no: 15BCE0985 Semester: 2 Slot: D1 Date: 24/04/2016 Faculty: Prof. Rajagopal D. Conducting polymers: Polyacetylene and Polyaniline - Mechanism of Conduction, doping; Conducting polymers: A conducting polymer is an organic based polymer that can act as a semiconductor or a conductor. The most widely studied organic polymers are polyaniline (PANI), polypyrroles, polythiophenes, and polyphenylene vinylenes. Conducting polymers (CPs) are extensively conjugated molecules: they have alternating single and double bonds. In these molecules, electrons are able to move from one end of the polymer to the other through the extended p-orbital system. Hence Conducting Polymers are known to be either
Hot Press molding. Factors affecting Quality There are various factors affecting the fabrication of Poly (ether sulphone). Firstly, the mold material plays an important role. The mold must sustain the high temperature while Poly (ether sulphone) cools. For this the mold should be made from high strength preferably of hardened steel.
The oxidation reaction of ethyne gas is facilitated by potassium permanganate, which is the catalyst in the reaction. The reaction allows ethyne to be oxidized into ethan-1,1,2,2-tetraol by breaking the two pi bonds between the carbons and adding hydroxyl groups. However, the new compound, having 2 hydroxyl groups on each carbon, results in the hydroxyl groups reacting with each other so that two H2O molecules are released and each carbon becomes double-bonded with an oxygen, creating ethandial. The ethandial is further oxidized, through the use of potassium permanganate, to oxalic acid as aldehydes are easily oxidized. No ethandial is preserved as the solution the reaction took place in was not acidic.
DIGITAL ASSIGNEMENT -2 INTRODUCTION • Fibre reinforced plastics also known as the fibre reinforced polymer is a composite material made of polymer matrix reinforced with fibre. • Has two important components Fibre and Matrix. • Classified as composite plastics ,i.e. made out of bonding of materials with two different material property derived to give a certain property of the material • The fibres usually consists of glass, carbon, aramid and basalt….whereas paper wood or asbestos the material rarely used in the form of fibre. • The polymer or matrix is generally an epoxy, vinyl ester or polyester thermosetting plastic…even phenol thermal raisins are also used for the fibre matrix.
Raw materials include fiberglass (in roving or mat form), unsaturated polyester resin and other additives. Reinforcement i.e. glass fibers is in accordance with mechanical properties of window frames. Polyester resin used because it is cheap and easily available. Resin contain additives like pigments, and initiator.
Yolanda Lu Mr. Eifert Science 6 8 January 2018 Expanded Polystyrene My Material Polystyrene is one of the most common synthetic polymers in the world. Expanded Polystyrene was first sold by the Dow Company, they renamed this Styrofoam. Expanded Polystyrene has many uses: construction, keep products cool, Panels. Expanded Polystyrene also has lots of advantages: it is easy to handle with when constructing, it is available in different ranges of thicknesses width and lengths, its freeze-thaw resistance, it has good pending pressure, and it 's easier to cut than most plastics. In some places, Expanded Polystyrene is mostly known as Styrofoam instead of Expanded Polystyrene.