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Preparation Of Methyl Methacrylate Lab Report

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1. Introduction
Acrylic glass is a solid, non-porous and hard material formed by polymerisation of alkyl acrylate ester. The chemical name of acrylic glass is Poly methyl methacrylate. This transparent thermoplastic is a polymer of methyl methacrylate and is used in form of sheets and tubes as an alternative to glass. Acrylic sheets Tubes Skylight
(Source: www.polymersenterprises.com)
2. Chemical reaction
Poly methyl methacrylate is produced from polymerisation of methacrylate through acetone cyanohydrin route (ACH). Acetone hydrocyanodrin is hydrodrolysed with sulphuric acid and results in the formation of sulphate ester of methacrylamide. In this reaction hydrogen is replaced by O-alkyl group. This further reacts with …show more content…

Properties
The properties of the material are induced due to the presence of pendant groups present in the polymer. Crystallization is prevented as the molecules of the polymer chain are not closely packed because of the pendant group (CH3). As a result, this polymer is amorphous, rigid and tough plastic.
“Pendant groups snag on adjacent groups and eliminate slip between polymer chains. This causes PMMA to be rigid, brittle, have a high glass transition temperature and little mold shrinkage.” (Website: http://steinwall.com)
Acrylic is scratch resistant than polycarbonate and hardest thermoplastic. The hydrolyzed ester groups make poly methyl methacrylate to swell and dissolve in organic solvents. Its resistance towards other chemicals is very poor. The methyl group blocks the possibility of chain transfer reaction during pyrolysis (molecular breakdown into smaller molecules under heated conditions) and gets converted almost completely to

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