Poly Alkyl Methacrylate Macromonomers

Yamashita 2 132) studied the copolymerization of co-methacryloyl-poly(methyl 

Yamashita et al.2,99) also investigated the copolymerization of PMMA macromonomers both with a mixture of HEMA and perfluoroalkyl acrylate and with a MMA-methacrylic acid mixture here again, the PMMA grafts originating from the macromonomer play the role of anchoring segments, and surface accumulation of the functional backbone segments is well established. 

The same authors132) studied the copolymerization of short co-methacryloyl-PMMA macromonomers with monomers such as styrene, vinyl acetate and acrylonitrile using AIBN as the initiator. They found that the copolymers formed are free of homopolymer these graft copolymers possessing a small number of very short grafts exhibit properties similar to those of the backbone chains. 

Waite 93,100) investigated the copolymerization of lauryl methacrylate macromonomers with methyl methacrylate and used the graft copolymers as stabilizers for the dispersions. The polar backbone is more compatible with dispersed polar droplets and the grafts, which are much less polar, are miscible with the continous phase, thus yielding stable oil-in-oil -dispersions. 

This brings new evidence of the surface accumulation of one of the constituents, a property that could lead to a great variety of applications, whenever surface modification is needed, e.g. in films, fibers, adhesives, coatings, varnishes, affinity chromatography etc. 

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Poly (alkyl methacrylate) macromonomers are formed by reaction of the living polymer with VBC. This method was shown to be free of side reactions and quantitative, in spite of the low nucleophilicity of the carbanionic site involved 72,75). 

Segmented terpolymers of poly(alkyl methacrylate)-g-poly(D-lactide)/poly(dimethylsiloxane) (PLA/PDMS) were prepared by combination of a grafting through technique (macromonomer method) and controlled/living radical polymerization such as atom transfer radical polymerization (ATRP) or reversible addition-fragmentation chain transfer polymerization. In a single-step approach, the low molecular weight methacrylate monomer (methyl methacrylate... 

A graft copolymer was prepared by Rohm GmbH [16] by copol5nnerizing 10-90 wt% of a poly(aIkyl methacrylate) macromonomer with Ce 30 alkyl methacrylates, Ci s alkyl methacrylates, styrene, Ci 4 alkyl styrene, <60 wt% C2-12 fatty acid vinyl esters, and <40 wt% functionalized comonomers from a group of vinyl heterocycles and fimctionalized methacrylates and amides. The lubricant additive was reported to have pronounced Vl-improving and dispersing efficiency. 

On the other hand, with decreasing alkyl chain length separating the styrene (vinylbenzene) group from PEO the particle size increases. This was interpreted in terms of differences in rl (a reactivity parameter) values. It was assumed that the apparent reactivity of the macromonomer (1/rj) (characterizing the relative reactivity of the macromonomer towards poly(butyl methacrylate) radical) in... 

In the following text we focus on cylindrical brushes prepared by polymerization of macromonomers, in particular on two systems. First, cylindrical brushes consisting of poly-2-vinylpyridine side chains and a poly-methacrylic main chain are discussed these were converted into cationic polyelectrolyte brushes by quaternization of the pyridine units by alkyl halides. The second system comprises sulfonated anionic cylindrical brushes, i.e. polymacromonomers with polystyrene side and main chains and polymacromonomers with polymethacrylic main and polymethacrylic acid side chains. 

Poly(2-alkyl oxazoline)s having methacrylate or acrylate end groups were prepared by two methods [182]. a) Living polyoxazoline chains, prepared using methyl p-toluene sulphonate as initiator, were end-capped by reaction with metal salts or tetraalkylammonium salts of acrylic or methacrylic acid or a trialky-lammonium salt or trimethylsilyl ester of methacrylic acid (functional termination). b) The living polymers were terminated with water in the presence of Na2C03 to provide hydroxyl-terminated chains. Subsequent acylation with acry-loyl or methacryloyl chloride in the presence of triethylamine led to the formation of the macromonomers. The procedures are outlined in the following Scheme 51. 

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