The polymerization of nylon: •For condensation polymerization to occur, monomers must be bifunctional, meaning they have There are three distinct steps in the addition polymerization … 1 In the case of a condensation reaction, two monomers combine with the loss of a small molecule, usually an alcohol, a water or an acid molecule, whereas an addition reaction involves only the rearrangement of the electrons of a double bond to form a single bond with another molecule. 23 Condensation Examples The addition-condensation system Addition polymers are those formed from monomers without the loss of a … Chain initiation: Usually by means of an initiator which starts the polymerization process. Examples of addition polymers include polyethylene, polystyrene, PVC etc. Addition polymerization Vs. Condensation Polymerization Explanation: polymerization is a process or phenomenon in which a large number of small molecules are combined to form a big or macromolecule. – silicones created by polymerisation by condensation; – silicones created by polymerisation by poly-addition. Condensation Examples. Step-growth polymerizations can be divided into two lasses: condensation and addition polymerization. An addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products. Belonging to the 1 st generation of silicones, polymers obtained through polymerisation by condensation have elasticity, hardness and safety properties that are not ideal. For example, nylon – 66 is obtained by the condensation of two monomers - hexa methylenediamine and adipic acid with the loss of water molecules. Condensation polymerisation Different monomers add to form a polymer with same molecular formula of the repeating structural unit as that of starting monomer. Addition polymerization is the process of adding monomer units so that the resulting chain is a perfect sum of all the atoms in the monomers. Give below in a tabular column is the difference between addition and condensation polymerization. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) Ziegler-Natta polymerization of ethylene The Ziegler-Natta polymerization of ethyleneEthylene gas is pumped under pressure into a reaction vessel, where it polymerizes under the influence of a Ziegler-Natta catalyst in the presence of a solvent. • Condensation polymers are made from two different monomers. PVC (polyvinyl chloride), which is found in plastic wrap, simulated leather, water pipes, and garden hoses, is formed from vinyl chloride (H 2 C=CHCl). Other Addition Polymers. Some polymers are made via condensation polymerisation. Condensation polymers form more slowly than addition polymers, often requiring heat, and they are generally lower in molecular weight. 2.What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? Chain addition polymerization also referred to as chain-growth polymerization technique is a chain reaction in which the growth of a polymer chain proceeds exclusively by reaction(s) between monomers(s) and active site(s) on the polymer chain with regeneration of the active site(s) at the end of each growth step. Type of Polymerization Monomers undergo polymerizaton by two types. In addition polymerization, Lewis acids, Lewis bases, and radical initiators are used as catalysts. H2O 22 Condensation Examples. Condensation polymers form more slowly than addition polymers, often requiring heat, and they are generally lower in molecular weight. There are 4 types of addition polymerization reaction: Radical polymerization in which the initiating species (Z*) is a radical while the site of reactivity (*) is a carbon radical. Molecular weight of addition polymers is integral multiple of monomer’s molecular weight. Addition Polymerization Condensation Polymerization For example, ethane diol and hexanedioic acid undergo condensation polymerisation to form a polyester. Polyesters are formed by the reactions between a carboxylic acid containing two carboxyl functional groups and an alcohol containing two hydroxyl groups. Condensation polymers are formed by polycondensation, when the polymer is formed by condensation reactions between species of all degrees of polymerization, or by condensative chain polymerization, when the polymer is formed by sequential addition (by condensation reaction) of monomers to an active site in a chain reaction. In condensation polymerisation, a small molecule is formed as a by-product each time a bond is formed between two monomers. Notice how every other carbon must have a chlorine attached. Condensation polymerization We have previously seen addition polymerization, where a double bond in a monomer is broken and used to form connect one monomer to another, progressively forming very long chain molecules. In addition polymerization process, the reacting monomers can only attach themselves to the active sites of the molecules. these small molecules are known as building blocks and called as monomers. The terminal functional groups on a chain remain active, so that groups of shorter chains combine into longer chains in the late stages of polymerization. There is a loss of some simple molecules such as water and alcohol due to the condensation mechanism. Scroll down the page for more examples and explanations. Nylon- Its a di acid plus a diamine and it yields a polyamide ; HOOC(CH2)4 COOH H2N (CH2)6 NH2. 1.Discuss the differences between condensation and addition polymerization. Polymerization reactions are the set of chemical reactions in which an initiator or hardener monomer active other monomer starting a chain reaction which forms the polymer.. The main difference between addition and condensation polymerization is that in former the polymers are formed by the addition of monomers with no by-products while in the latter polymers are formed due to the condensation of two different monomers resulting in the formation of by-products. Chemical reaction - Chemical reaction - Polymerization reactions: Polymers are high-molecular-weight compounds, fashioned by the aggregation of many smaller molecules called monomers. In commercial addition and condensation polymerization processes reactor design is an important factor for the quality and economics of the polymer. Condensation polymerization: This type of reaction involves the repetitive condensation between two bi-functional monomers. Addition polymerisation produces addition polymers through the addition of olefinic monomers without the formation of any by-product. Differences Between Addition Polymerization and Condensation Polymerization Describe what is meant by a condensation polymer. Addition polymerization differs from condensation polymerization, which does co-generate a product, usually water. This summing distinguishes addition polymerization from condensation polymerization in which small molecules are eliminated as the monomers are assembled in … 2. The polymerization process takes place in three distinct steps: 1. The reaction is shown in the graphic on the left. Scroll down the page for more examples and explanations. Ethane diol: Condensation Polymerization Monomers combine to form a polymer and a bi-product. Definition: Condensation is a reaction … Characteristics of Condensation silicones. Some common examples of addition polymerization are polyethylene, Teflon, and PVC. Different molecules are used as catalysts in the process of condensation polymerization. Examples of condensation polymers are Nylon 66, terylene, bakelite, and alkylresins. 4.Describe biopolymer and synthetic polymer. Polyesters are examples of a polymers produced from condensation polymerisation. What is polymerization? The key difference between addition and radical polymerization is that the addition polymerization occurs via the addition of unsaturated monomers whereas the radical polymerization occurs via the addition of free radicals.. Polymerization is the process of producing a polymer using a large number of monomers. In addition polymerisation, the monomers must have a C=C double bond. 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