Acrylic macromonomers

These fluorinated cotelomers are novel precursors of the following original (meth)acrylic macromonomers (R=H or CH3) ... 

Recently, Muller et al. studied block and graft copolymers poly(n-butyl acrylate)-Wocfc/gra/f-poly(acrylic acid), PnBA-h/g-PAA [136]. The non-polar block/backbone has a low glass transition temperature, thus dynamic micelles were expected the ionic block/side-chains are weak anionic polyelectrolytes, thus a strong dependence of micellization on pH could be expected. The graft copolymers were synthesized by ATRP copolymerization of poly(-ferf-butyl acrylate) macromonomers with n-butyl acrylate, followed by hydrolysis of the terf-butyl acrylate side-chains to PAA [137]. The length of the PAA side chains was varied from 20 to 85 monomer units and their number from 1.5 to 10, whereas the length of the backbone was kept at ca. 130 units. 

To overcome the difficulties of ESI-MS, Simonsick and Prokai added sodium cations to the mobile phase to facilitate ionization [165,166]. To simplify the resulting ESI spectra, the number of components entering the ion source was reduced. Combining SEC with electrospray detection, the elution curves of polyethylene oxides) were calibrated. The chemical composition distribution of acrylic macromonomers was profiled across the molar mass distribution. The analysis of poly(ethylene oxides) by SEC-ESI-MS with respect to chemical composition and oligomer distribution was discussed by Simonsick [167]. In a similar approach aliphatic polyesters [168], phenolic resins [169], methyl methacrylate macromonomers [169] and polysulfides have been analyzed [170]. The detectable mass range for different species, however, was well below 5000 g/mol, indicating that the technique is not really suited for polymer analysis. 

Acrylic Macromonomers. Acrylic-methacrylic macromonomers prepared by catalytic chain transfer using cobalt(II) chelates afford polymer chains, each with an olefinic endgroup (18, 24). Such macromonomers can be polymerized or copolymerized to produce graft polymers that are useful in coatings, fibers, films, and composite materials applications (24). Moreover, one is able to synthesize macromonomers containing several alkylmethacrylates, alkylacrylates, and styrene (IS). 

Scheme 56 Synthesis of poly( -butyl acrylate) macromonomer...

Sergeyeva et al. [90,91] had introduced a very promising improvement by using an oligourethane-acrylate macromonomer in imprinting polymerization mixtures in order to increase the flexibility and mechanical stability of the membranes self-supported MIP membranes with a thickness between 60 and 120 pm could be prepared. Sreenivasan [92] had also addressed the problem of film stability, and a semi-IPN film was prepared by the polymerization of HEMA in a blend with polyurethane. 

Scheme P12.1.1 Synthesis of PStsQ-acrylate macromonomer according to the method of Vogt and Sumerlin (2006). For details, see Problem 12.1.

Chemically grafting the PEG chains Particles with different surface densities of PEG were prepared by copolymerisation of styrene with methoxy(PEG) acrylate macromonomer. Particle uptake by the Kupffer cells (in rat studies) decreased with increasing graft density. Only particles with a very low PEG den-... 

More monomers are mentioned in patent literature but details of the reaction conditions are discrete. One such example is the CCTP of a hydrophilic acrylic macromonomer. Sodium acrylate and ammonium acrylate homopolymers are mentioned and most likely to be examples of cobalt-mediated radical polymerization (CMRP) rather than of CCTP. ... 

The GPE was composed of a PEG-based acrylate macromonomer, photoinitiator, plasticiser, glass beads and the electrolyte to compensate for the charge injected into or extracted from the conducting polymer. The ionic conductivity of lithium-PEO has been reported to be at a maximum for a Li/O ratio of 0.04 and hence the composition of the GPE with no plasticiser was prepared with this ratio. The different compositions of the GPEs used in this study are shown in Table 12.1. 

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