~et--The photoinitiated polymerization of methyl methacrylate by triethyl-aluminium is shown to occur by a free radical mechanism, initiated by a photoexcited state of a 1 : I Wittig '-ate' complex between MMA and Et3AJ. A survey of related compounds shows that only monomers having an unsaturated g
Polymerization of methyl methacrylate by organo-metallic compounds. The mechanism of initiation by triethyl-aluminium
โ Scribed by P.E.M. Allen; B.A. Casey
- Publisher
- Elsevier Science
- Year
- 1966
- Tongue
- English
- Weight
- 294 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0014-3057
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โฆ Synopsis
The polymerizations of methyl methacrylate and methyl acrylate in the presence of triethylaluminlum are photochemical. The initiator is a yellow complex formed between monomer and triethyl-aluminium. Experimental evidence is weighted against a radical mechanism. An anionic insertion mechanism involving the photo-excited state of the yellow complex is proposed.
๐ SIMILAR VOLUMES
The initial rate of polymerization is where Io is the incident illumination and [A12Ets]o is the total molar concentration of tfialkyl aluminium dispensed, estimated as dimer. Direct photolysis of the 1 : 1 MMA:AIEts Wittig-"ate" complex is not responsible for polymerization. Initiation is thought
The polymerization of methyl methacrylate mechanochemically initiated by the grinding of several inorganic compounds was attempted using a vibrating ball mill. The inorganic compounds used were quartz, quartz glass, marble, limestone, feldspar, and talc with the particle size range of 149-210 pm. Th
## Abstract A divalent samarium complex that bears two bulky phenoxide ligands promotes the living polymerization of methyl methacrylate in the absence of cocatalyst. The initiation involves a tailโtoโtail coupling reaction of the samariumโenolate radical followed by a oneโelectron reduction of the
## Abstract The effect of air in atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was studied. Air initiated polymerization was clearly noticed by the appearance of a low molecular weight peak in the synthesis of high molecular weight poly(isobutylene)โ__graft__โpoly(methyl