Polybutyl Methacrylate monomer

Nevertheless, the monomer moment calculated from the random flight model for polybutyl methacrylate in CC14 at 40°, is 1.90 D, a value which is very close to that of most aliphatic esters. This would seem to prove that, at temperatures higher than 40°, the moment has reached its highest possible value. 

In polymers with side groups that are a part of the regular structure of one of the monomers, as in the case of polystyrene, polypropylene, polybutyl methacrylate, etc., we generally do not consider these as branches or side chains. Instead, they are called side groups. An exception to this rule is for polyethylene/a-olefin copolymers, the LLDPE family, where the side group is referred to as a side chain. The reason for this exception is that the polymers look exactly like those that could be made by a side chain growth reaction. In fact, it is common for books to list LLDPE as a branched polymer, even though its name, linear low density polyethylene, clearly and correctly describes it as a linear polymer. 

Individual molecules will differ in the proportions of the comonomer units, but the overall proportions will depend on the ratio of the monomers charged into the reaction vessel. Copolymers have properties in between those of the homopolymers which could be made from the separate components. Thus polymethyl methacrylate is hard, relatively brittle and insoluble in petrol. Polybutyl methacrylate is softer, more flexible and soluble in petrol. A copolymer, predominantly methyl methacrylate, could remain insoluble in petrol (though softened by it) and yet be more flexible than polymethyl methacrylate. 

Details are given of the control of latex particle size and particle size distribution in semibatch emulsion polymerisation of polybutyl methacrylate and polymethacryhc acid. A seeded technique was used to examine secondary nucleation during monomer addition. 12 refs. 

A study was made of the impact of incorporation of a small amount of carboxylic monomers (acrylic acid or methacrylic acid) into the latex particles in the limited flocculation process, often encountered in the semi-batch surfactant-free emulsion polymerisation of pure butyl acrylate. The possibility of producing carboxylated polybutyl acrylate latices with a smaller particle size was evaluated. The resultant latex was characterised to gain a better understanding of the effect of the surfactant-free technique on their physical properties, e.g. zeta potential, distribution of acrylic acid or methacrylic acid in the particles, and stability towards the added salt, compared with the conventional emulsion polymerisation system stabiUsed by surfactants. 35 refs. 

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See also in sourсe #XX -- [ ]

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