alpha,omega-Dihydroxy telechelic poly(methyl methacrylate) via beta-scission (radical addition-fragmentation) chain transfer polymerisation by macromonomer chain transfer agents, as prepared by catalytic chain transfer polymerisation
UNSPECIFIED. (1996) alpha,omega-Dihydroxy telechelic poly(methyl methacrylate) via beta-scission (radical addition-fragmentation) chain transfer polymerisation by macromonomer chain transfer agents, as prepared by catalytic chain transfer polymerisation. MACROMOLECULAR CHEMISTRY AND PHYSICS, 197 (9). pp. 3027-3042. ISSN 1022-1352Full text not available from this repository.
alpha,omega-Dihydroxy telechelic poly(methyl methacrylate) has been prepared by beta-scission (radical addition-fragmentation) chain transfer polymerisation. Hydroxyethyl methacrylate dimer macromonomer prepared from catalytic chain transfer polymerisation and isolated as a pure compound is shown to be an efficient chain transfer agent. The mode of chain transfer is via beta-scission which results in the dimer breaking in half on addition to a propagating poly(methyl methacrylate) radical terminating the polymerisation and providing a hydroxyethyl methacrylate radical which reinitiates polymerisation. A combination of these two events leads to dihydroxy telechelic products, demonstrated to have a functionality of 2.05 by a combination of NMR and size exclusion chromatography (SEC). The chain transfer coefficients of these methacrylic macromonomers is concentration dependant exhibiting a type of ''bootstrap'' effect. This ultimately leads to a limiting low molecular weight telechelic product by the use of dimeric beta-scission chain transfer agents. A combination of high field NMR and matrix assisted laser desorption time-of-flight mass spectrometry has been utilised to demonstrate the structure of the products. The combination of catalytic chain transfer polymerisation and beta-scission chain transfer has been demonstrated to be a powerful tool in the controlled polymerisation of methacrylates by radical methodology.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry|
|Journal or Publication Title:||MACROMOLECULAR CHEMISTRY AND PHYSICS|
|Publisher:||HUTHIG & WEPF VERLAG|
|Number of Pages:||16|
|Page Range:||pp. 3027-3042|
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