The present invention relates to polyvinyl chloride plastisol compositions‚ for example sealant compositions. In the manufacture of automobiles‚ the automobile body is initially primed with a coating composition to prevent corrosion of the metal. This can be done in a number of ways although generally it is performed by cationic electrodeposition using the auto body as the cathode. Once the automobile body has been primed in this manner‚ subsequent steps in the assembly are carried out. These
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POLYMER SYNTHESIS AND PROPERTIES AIM: The aim of the experiment was to prepare three different polymers‚ namely nylon 66‚ Agar Gel and slime‚ being able to differentiate between the configuration and analysis among the three structures‚ noting the physical characteristics of each polymer and the chemical reactions that occur during the formation of the polymer. Pre- lab questions 1. Is Nylon 66 a step or chain – growth polymer? Define both types of polymerization in your answer. Nylon 66
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Write down the full name of the following. Mention their application in polymer science. (Any Five) a) Tg c) M n d)ENR e)GPC f) ’Q’ (5 X 2) == 10 3. Answer the following (i) Name a rubber which has high impermeability to gases and a rubber which has got very high permeability to gases. (ii) Name two rubbers which are vulcanized by peroxide. (iii) Name two rubbers which are vulcanized by sulphur. (iv) Name a polymer which has a hetero atom in the main chain and name another rubber which has
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Introduction Polytetrafluoroethylene (PTFE)‚ more commonly known as Teflon‚ is a polymer. Polymer is a substance which contains many structural units that are joined the same type of linkage.(1) Hence‚ the molecular structure of polytetrafluoroethylene is based on a chain of carbon atoms. However‚ unlike some other fluoropolymers‚ in Teflon the chain is completely surrounded by fluorine atoms.(2) There is a very strong bond between fluorine atoms and the carbon as the fluorine atoms act as a protective
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production of PHB began after the 1990s because of the growing need for a environmentally friendly plastic alternative. Properties of PHB... The biodegradability of PHB gives it extraordinary appeal as a potential replacement for the widely used polymers derived from petrochemicals. These petrochemical products‚ such as polypropylene and polyethylene‚ are often used for packaging‚ but are a hazard to the environment because of the fact that when discarded they do not decompose and can cause injury
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at 190°Cwere identified through the use of an extrusion plastometer. The data obtained was used to determine the average melt flow rate and melt flow index. Introduction: Polymers are an important class of materials. The range of properties of polymeric materials allows it to be essential in everyday life. The simplest polymer is polyethylene which consists of long chains of C2H4 monomers. Each monomer is joined by a covalent bond while the bonding between the chains is a weak van der Waals bond
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Introduction One of the most precise measurements in polymer science is also the simplest and cheapest. Intrinsic viscosity‚ which is measured from the flow time of a solution through a simple glass capillary‚ has considerable historical importance for establishing the very existence of polymer molecules. It also provides considerable physical insight. In this lab‚ each group will study the intrinsic viscosity of hydroxypropylcellulose‚ a common polymer derived from cellulose--hopefully at a different
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EXECUTIVE SUMMARY 0.1 0.1.1 GENERAL Nylon Tyre Cord: Nylon tyre cord is made from high tenacity continuous filament yarn by twisting and plying. There are two major types of nylons used as tyre cord‚ i.e. nylon-6 and nylon-6‚6. The properties of nylon-6 and nylon-6‚6 vary marginally and are controlled by the manufacturing process‚ type of stabilisers and additives used. In India only nylon-6 is produced commercially for tyre cord. Thetypesofnylon-6tyrecordusedinIndiaare840/2‚1260/2‚1260/3‚
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includes‚ coacervation phase separation and polymer encapsulation by rapid expansion of supercritical fluid. Chemical processes‚ include solvent evaporation interfacial polymerization‚ insitu polymerization‚ polymer/polymer incompatibility and vapor deposition. The technique chosen is dependent on the chemical and physical properties of the core material. There are many factors that affect the efficiency of encapsulation. This includes‚ solubility of polymer in solvent‚ solubility of organic solvent
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Investigating the Ratio Between Poly-Vinyl Alcohol and Sodium Borate to form a Bouncing Ball Timothy English Gen. Chem. 1 Lab Section: 009 Introduction: Poly-Vinyl Alcohol (PVA) is a water-soluble synthetic polymer that will be used as one element to form the well know bouncing ball‚ along with Sodium Borate (borax)‚ which has a variety of uses because of its weak base. PVA is ideal for this experiment because it is odorless‚ nontoxic‚ has high tensile strength and flexibility. The
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