Polymerization Of Methyl Methacrylate By Thiocarboxylic Acids

Author : Chenying Zhao
Publisher :
ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (126 download)

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Download or read book Synthesis and Functionalization of Hyperbranched Poly(methyl Methacrylate) written by Chenying Zhao and published by . This book was released on 2019 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hyperbranched polymers have unique physical and chemical properties that make them interesting to people in both academia and industry. One way to make hyperbranched polymers is to use self-condensing vinyl polymerization (SCVP). Hyperbranched polymethacrylates can be prepared from methacrylate inimers (inimers are monomers that contain both initiation and polymerizable groups) by atom transfer radical polymerization (ATRP) and self-condensing vinyl polymerization (SCVP). The methyl methacrylate inimer was synthesized by reacting the carboxylic acid group of 2-bromo-3-hydroxy-2- methylpropionic acid with methacrylic acid and esterifying the alcohol group with methanol.4 This methyl methacrylate inimer was then polymerized under atom transfer radical polymerization conditions. Post-polymerization functionalization is often used to change and/or improve the properties of polymers. For hyperbranched polymers made by atom transfer radical polymerization, the halogen atoms (chlorine or bromine) remaining in the polymer backbone provide sites for post-polymerization functionalization. The halogen atoms in polymethacrylates are bonded to tertiary carbons, which are more hindered and less electrophilic than the halogen sites in hyperbranched polyacrylates, but are presumably more susceptible to cationic rearrangement. The hyperbranched poly(methyl methacrylate) is rearrangeable with heating and to give a primary bromine.