Polyethylene, PVC, Polypropylene, Nylon 6 Co Polymers A polymer consist of monomers of different chemical structure are called copolymers. Polyvinyl chloride (PVC) contains monomer. The unit substance or substances from which the polymer is obtained is called a monomer. Oligomer – a small macromolecule consisting of around 10 to 100 chemically bonded monomer repeat units. Polymer and monomers (Polymers definition) Polymers are high molecular mass substances containing large number of repeating structural units derived from simple molecules. These monomers are known as straight polymers. These reactions are classified as: Depending on how they are linked or joined (chemical bonds or intermolecular forces) and on the arrangement of the different chains that forms the polymer, the resulting polymeric materials can be classified as: Depending on the chemical composition, polymers can be inorganic such as glass, or they can be organic, such as adhesives of epoxy resin. The average molecular weight directly determines both the size of the polymer and its chemical and mechanical properties of the polymer (viscosity, wet, creep resistance, abrasion resistance ...), for example polymers with high average molecular weight materials are very viscous. 2) The gel gradually disintegrates into true solution. It can also be prepared by ring-opening polymerization of lactide [–C(CH 3)HC(=O)O–] 2, the cyclic dimer of the basic repeating unit. Thus molecules like ammonia, water, ethanol etc are not monomers. E.g. The synthetic polymers can be further classified as these made up of monomers and comonomer units. Branched Polymers - Linear polymer with branches with same structure/polymer as the main chain (1 kind of polymer) Crosslinked/network Polymers - Chemical linkage exist between polymer chain . Polymers can be classified by using the backbone of the polymeric chain, type of synthesis, source, monomer, molecular forces, etc. Homopolymer consist of only one type of monomers. The glass transition temperature of polymers determines the temperature at which the polymer mechanical properties of polymers change dramatically, when the glass transition temperature is slightly below room temperature the polymer behaves like an elastic material (elastomer), when the temperature is higher than the glass transition temperature the polymer behaves as a rigid material (thermoset). Polymers may however still be subject to authorisation and restriction. 1. These are natural polymers with some modifications. new clarification of intermediate definition. These are expected to be quite hard, rigid and brittle. Anything that is made up of same type of Chemical composition which is repeated numerous times can be considered as a polymer. what needs to be done for notified polymers has been added (4 pages). These polymers have high melting points and are of higher density. All have a large global … Classification of Polymer based on Structure. Addition, Videos and Examples Polymers: Classification, Polymerization, Biodegradable Polymers, Rubber. 1. By Monomer Homo Polymers A polymer consist of identical monomers is called homo polymer. Based on their structure, the polymers can be classified into three types such as linear polymers, branched-chain polymers, and network, or cross linked polymers.  Copolymer: When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. Common examples would be … 3. E.g. cellulose, jute, linen, silk, wool etc. Polymers: Lecture 2 Prepared by Dr Arunima Nayak and Dr Brij Bhushan Classification of Polymers 1. Poly he a methylene dopamine 4. Due to their complex structures, different behaviours, and vast applications we can, classify polymers based on the following criteria: Polymers based on the Source of Availability . 55 plastic polymers were ranked based on monomer classifications, and assessed. Polyethylene consist of monomer ethene only. Branched chain Polymers are linear polymers containing branches. The polymers were ranked based on monomer hazard classifications, and initial assessments were made. Conveniently, all polymers can be assigned to one of two groups based upon their processing characteristics or the type of polymerization mechanism. There are various ways to classify polymers based on source, structure, mode of forming, molecular forces etc. under REACH. 3] Based on Mode of Polymerisation Polymerization is the process by which monomer molecules are reacted together in a chemical reaction to form a polymer chain (or three-dimensional networks). Monomer – a molecule that can be polymerized to form a polymer. Classification Based on Composition of Polymers:  Homopolymer: A polymer resulting from the polymerization of a single monomer; a polymer consisting substantially of a single type of repeating unit. Thus, a co-polymer is obtained when two or more suitable monomers are polymerised together. Polypropene, also known as polypropylene, is made up of monomer propene. There are several ways of classification of polymers based on some special considerations. These may be represented as : -[A-A-A-A-A-A]- Homopolymers are commonly named by placing the prefix poly in front of the constituent monomer name. 1.1 Classification of Polymers. A polymer is a high molecular mass compound ranging from 5000 to one million and they are formed by the combination of a large number of one or more low molecular weight compounds. Examples of cross linked polymers are bakelite, glyptal, melamine-formaldehyde polymer etc. Classification of polymers. The average molecular weight of the polymer molecular. Polymers can also be classified based on the type of monomers present in them. For example; Cellulose diacetate, Vulcanised rubber. Polymers; Polymer chemistry; monomers; polymerisation; example;uses; questions; revision. Polylactic acid, or polylactide (PLA) is a thermoplastic polyester with backbone formula (C 3 H 4 O 2) n or [–C(CH 3)HC(=O)O–] n, formally obtained by condensation of lactic acid C(CH 3)(OH)HCOOH with loss of water (hence its name). For example Polymers example Polythene Polyvinyl chloride (PVC) Nylon Teflon Bakelite Terylene Cellulose diacetate Vulcanised rubber Starch Melamine formaldehyde resin Polymers Uses Coatings Adhesives Laminates Electrolytes Plastic pipes Films Questions on polymers What are polymers? Polymers are classified into three types on the basis of Structure. Polymer is defined as very large molecules having high molecular mass. Copolymer: On the other hand, a copolymer is made up of two or more types of repeating units. 27/05/2008 : Version 2.0 . The Polymers prepared in laboratory are called synthetic Polymers. These techniques are based on forcing a polymer solution through a matrix of cross-linked polymer particles at high pressure of up to several hundred bars. The process of converting monomers to polymer is called polymerization. A few other polymers that are traditionally recognized as belonging to the addition class are polymerized not by addition to an ethylene double bond but through a ring-opening polymerization of a sterically strained cyclic monomer. Classification of Polymers. Naturally occurring polymers: These occur in plants and animals and are very essential for life. Alkenes, vinyl chloride, adipic acid, glycol with two bonding sites act as monomers. Alternatively, more explicit structure-based nomenclature can be used when the polymer structure is proven. For example;High density polythene,PVC, Nylon, Polyester. Polymer nomenclature usually applies to idealised representations; minor structural irregularities are ignored. The monomers in … Based on Number of Monomers: Polymers can be homopolymer or copolymer when the number of monomers are one and two respectively. 2. preparation of polymers. ADHESIVE & GLUE | Most important addition polymers are polymerized from olefins and vinyl-based monomers. Based on the type of polymerization, polymers can be classified as: i) Addition polymers: These type of polymers are formed by the repeated addition of monomer molecules. The small molecules that are used in synthesizing a polymer are called monomers. They have vast chemistries and provide low cost, low emissions, zero VOC, good shelf-life, freeze-thaw stability, and potential sustainability in many coating formulations.Due to these benefits, the use of emulsion polymers is increasingly used in paints and coatings serve growing needs in diverse sectors and applications. Based on Structure of Polymers: There are three different types based on the structure of the polymers. Polymers are a huge chain of molecules. The following are some of the common classifications of polymers: Under this type of classification, there are three sub categories. 2. In these polymers the monomer units are joined to form long chain with branches of different length. 2. Therefore, cannot be classified under a single branch. Classification of polymers Based on the Structure .  Copolymer: When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. Polymers are macromolecules having high molecular weights and they are composed of smaller repeating units called monomers. On the basis of the monomers polymers are classified into two types namely. In these polymers the monomer units are joined to form a long and linear chain. Each monomer that is added to form polymers is called repeat units. The reactivity ratio of a growing copolymer chain terminating in a given monomer is the ratio of the reaction rate constant for addition of the same monomer and the rate constant for addition of the other monomer. What are monomers? An elastomer must be above its glass transition temperature, \(T_g\), and have a low degree of crystallinity. Polymers are formed through chemical reactions that convert large numbers of low-molecular-weight molecules, known as monomers, into large, very high-molecular-weight long-chain macromolecules.Resins are compositions of either monomers or macromolecules blended with other components to provide a material with a useful set of properties. These monomers are known as straight polymers. Classification based on the Structure of Polymers. Copolymer - It is called when the polymer formed by at least 2 different monomers along the entire chain. Based on Structure/Shape of polymer Polymers can be linear, branched, cross linked or networked. Classification of Polymers Based on Structure (i) Linear polymers These are the polymers in which the monomer units are linked to one another to form long linear chains. Polymers are high molecular mass substances containing large number of repeating structural units derived from simple molecules. 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