Polymer is used as a synonym for plastic . 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 . Monomers react with each other in end to end fashion such that they form linear or straight chains of polymers. Copolymer: On the other hand, a copolymer is made up of two or more types of re… There are several ways of classification of polymers based on some special considerations. Thousands of different polymers have been synthesized and more will be produced in the future. Polyethylene Classification of Polymers 1. 1.2 Polymer Structure. These linear chains are closely packed in space. Structure of polythene. 3. Polymers are divided into three types on the basis of source of availability. E.g. These monomers are known as straight polymers. 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. The transformation of ethene to polythene and interaction of hexamethylene diamine and adipic acid leading to the formation of Nylon- 6, 6 are examples of two different types of polymerisation reactions. They are classified into two broad categories. Thus molecules like ammonia, water, ethanol etc are not monomers. Polymer is basically thousands/millions of monomer units or single repeating unit connected in long chains. Copolymer - It is called when the polymer formed by at least 2 different monomers along the entire chain. Since the entropy of mixing ΔS is always positive. These include starch cellulose, proteins, nucleic acids and natural rubber. Addition Polymers are formed by the repeated addition of monomers containing double or triple bonds. Classification: Classification Based on Source:  Natural Polymers: These polymers are found in plants and animals. Common examples would be … All about Polymers and polymer chemistry for undergraduate students. All have a large global … Classification of polymer based on sources. 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. Copolymer - It is called when the polymer formed by at least 2 different monomers along the entire chain. The following are some of the common classifications of polymers: Under this type of classification, there are three sub categories. 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. Classification of polymers: Classification based on source of availability: 1. The basic part of a polymer are the monomers, the monomers are the chemical units that are repeated throughout the chain of a polymer, eg polyethylene monomer is ethylene, which is repeated x times along throughout the chain. Monomers are thus building blocks of polymers. Alternatively, more explicit structure-based nomenclature can be used when the polymer structure is proven. Different types of polymers: 1) homopolymer 2) alternating copolymer 3) random copolymer 4) block copolymer 5) graft copolymer. Artificial polymers: They are artificially made in industries for various commercial uses. These are natural polymers with some modifications. Classification of polymers. • These chains has no any side chains, ex. 2] Classification Based on Structure of Polymers Classification of polymers based on their structure can be of three types: (i) Linear polymers: These polymers are similar in structure to a long straight chain which identical links connected to each other. 1. The urea-formaldehyde resin is a non-transparent plastic obtained by heating formaldehyde and urea. Examples are proteins, cellulose, starch, resins and rubber. Based on Source: Under this type of classification, there are three subcategories. of monomers join together to form long chains. In these polymers the monomer units are cross-linked to form a three dimensional network. Monomer – a molecule that can be polymerized to form a polymer. The polymers that ranked as most hazardous are made of monomers classified as mutagenic and/or carcinogenic (category 1A or 1B). Poly he a methylene dopamine 4. Polymers can be classified by using the backbone of the polymeric chain, type of synthesis, source, monomer, molecular forces, etc. Quick summary with Stories. The building block through which any polymer molecule is built is known as a monomer. Monomers are small and simple molecules depend and have a capacity of forming two chemical bonds with two other monomers. ADHESIVE & GLUE | 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). 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. Depending on the repetition or variety of monomers, polymers are classified as: Homopolymer - It is called when the polymer formed by the same monomer throughout its chain. There may be extensive van der Waals and hydrogen bonding between the chains. What is polymerisa, Solubility process The dissolving process in polymer is very slow and occurs in two steps as 1) The solvent dissolves into the polymer to give a swollen gel. Based on Origin: a) Natural polymers e.g starch, silk and wool. The synthetic polymers can be further classified as these made up of monomers and comonomer units. POLYMERS . These polymers have high Polymers: Lecture 2 Prepared by Dr Arunima Nayak and Dr Brij Bhushan Classification of Polymers 1. A copolymer is a polymer derived from more than one species of monomer. The small molecules that are used in synthesizing a polymer are called monomers. The synthetic polymers can be further classified as these made up of monomers and comonomer units. The cross-linking restricts the motion of the chains and leads to a rigid material. Synthetic polymers: A variety of synthetic polymers as plastic (polythene), synthetic fibres (nylon 6,6) and synthetic rubbers (Buna – S) are examples of manmade polymers extensively used in daily life as well as in industry. 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). In this case heat of mixing per unit volume ∆H= v₁v₂ ( δ₁-δ₂)² Here v₁ and v₂ are volume fraction of solvent and polymer respectively and δ² is the cohesive e, Classification based on source of availability, Classification of Polymers on the basis of Structure, Classification of polymers on the basis of synthesis. 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. The polymer chains still have some freedom to move, but are prevented from permanently moving relative to each other by the cross-links. 2] Classification Based on Structure of 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 process of converting monomers to polymer is called polymerization. If they are classified based on the backbone of the polymeric chain then they will be divided as organic and inorganic polymers. On the basis of monomers On the basis of the monomers polymers are classified into two types namely 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. All have a … The small molecules that are used in synthesizing a polymer are called monomers. For example; Bakelite, melamine formaldehyde resin. Classification of polymers Based on the Structure . Polymers are classified into three types on the basis of Structure. Examples: polyethylene, PVC, nylon. Each monomer that is added to form polymers is called repeat units. 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