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Analysis of the end groups of poly(methyl methacrylate)
Author(s) -
Stolarzewicz Andrzej,
MorejkoBuż Barbara,
Grobelny Zbigniew,
Neugebauer Dorota
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)184:1<325::aid-masy325>3.0.co;2-p
Subject(s) - macromolecule , polymerization , polymer chemistry , chemistry , protonation , methyl methacrylate , chain transfer , end group , anionic addition polymerization , potassium , pendant group , radical polymerization , organic chemistry , polymer , ion , biochemistry
Methyl methacrylate polymerization by potassium hydride results in macromolecules with the methyl starting group. A side‐reaction occurs during the process leading to potassium methoxide. It serves as the second initiator of the polymerization and gives macromolecules with the methoxy starting group. All macromolecules possess the methine group at the chain end after protonation. Potassium alkalide K − , K + (15‐crown‐5) 2 produces various active centres in the initial step of the polymerization. It results in macromolecules with the methyl, ethyl, methoxy and vinyl ether starting groups. However, the majority of macromolecules are formed on the species with two active centres. The termination reaction takes place during the polymerization, therefore, not all chains have the methine end group after protonation.