DIMETHYL ACRYLAMIDE

Weaker polar monomers like, vinylacetate, N-vinyl pyrrolidone, fV-vinyl caprolactam or MiV-dimethyl acrylamide may be used at levels as high as 30-40% of the total monomers. Combinations of polar monomers [65-67] can also be used to formulate acrylic PSAs with a good balance of properties. 

Figure 17-24. Monomers in a copolymer for viscosifying diesel N,N-dimethyl-acrylamide and N,N-dimethylaminopropyl methacrylamide.

PS—polystyrene, PMMA—poly(methyl methacrylate), PMA—poly(methyl acrylate), PDMAEMA—poly((Nd f-dimethylamino)ethyl methacrylate), PDMA—poly( dimethyl-acrylamide), P(t-BA)—poly(tert-butyl acrylate), PAA—poly(acrylic acid), PPFS—poly (pentafluorostyrene), PHFA—poly(heptadecafluorodecyl acrylate)... 

Based on the optimization reactions described, the polymerization temperature was kept constant at 110°C for the NMP of W,W-dimethyl acrylamide (DMA), A-acryoyl morpholine (Amor), and 2-hydoxypropyl acrylate (HPA). However, it... 

Scheme 4 Schematic representation of the chemical structures of the monomers A,A-dimethyl acrylamide (DMA), A-acryoylmorpholine, and 2-hydroxypropyl acrylate...

The first antibody-catalyzed asymmetric 1,3-dipolar cycloaddition was reported recently by Janda and co-workers (382). The reaction of the relatively stable nitrile oxide 280 and dimethyl acrylamide 281 was catalyzed by antibody 29G12 having turnover numbers >50, and the product 282 was obtained in up to >98% ee (Scheme 12.89). The antibody 29G12 was formed for hapten 283 and coupled to a carrier protein by standard protocols. The hapten 283 contains no chiral center and therefore the immune system elicited a stereochemical environment capable of stabilizing the enantiomeric transition state leading to 282. 

Some of the primary comonomers that were investigated in the MACROMER studies were the acrylates, vinyl chloride, styrenes, ethylene, ethylene/propylene, acrylonitrile, and N,N-dimethyl-acrylamide. 

TABLE 1. Copolymers of Trans-l,4-bromo-2-butene Formed by Condensing with Selected nucleophiles in AyV-dimethyl Acrylamide Using a 1 1 Reagent Charge"... 

In the mid to late 1990s, Mimotopes was producing rigid injection molded polypropylene devices that were surface grafted with either a hydrophilic copolymer of methacrylic acid/dimethyl acrylamide or the relatively hydrophobic polystyrene.12 The polymer was then suitably deriva-tized to allow the incorporation of a linker system. In contrast to the various commercial resins available at the time, the Crown was a macroscopic, quantized solid phase. As shown in Fig. 2, the Crowns were typically fitted to a polypropylene stem, which in turn could be fitted into a... 

In some but not so rare cases, however, reactivity of macromonomers was found to be apparently reduced by the nature of their polymer chains. For example, p-vinylbenzyl- or methacrylate-ended PEO macromonomers, 26 (m=l) or 27b, were found to copolymerize with styrene (as A) in tetrahydrofuran with increasing difficulty (l/rA is reduced to one half) with increasing chain length of the PEO [41]. Since we are concerned with polymer-polymer reactions, as shown in Fig. 3, the results suggest that any thermodynamically repulsive interaction, which is usually observed between different, incompatible polymer chains, in this case PEO and PSt chains, may retard their approach and hence the reaction between their end groups, polystyryl radical and p-vinylbenzyl or methacrylate group. Such an incompatibility effect was discussed in terms of the degree of interpenetration and the interaction parameters between unlike polymers to support the observed reduction in the macromonomers copolymerization reactivity [31,40]. Similar observations of reduction of the copolymerization reactivity of macromonomers have recently been reported for the PEO macromonomers, 27a (m=ll) with styrene in benzene [42], 27b with acrylamide in water [43], and for poly(L-lactide), 28, with dimethyl acrylamide or N-vinylpyr-rolidone in dioxane [44]. 

Materials. All monomers used for synthesis were free of inhibitors and freshly distilled 2-hydroxyethyl methacrylate (HEMA) dimethyl-acrylamide (DMA) N-vinylpyrrolidone (NPV) methylmethacrylate (MMA) 2-ethylhexylacrylate (EHA) isopropylmethacrylate (IPMA) n-butyl-acrylate (BA) ethyleneglycol-dimethacrylate (EGDMA) dimethacrylate macromer obtained by reaction of 1 mol polytetramethylene oxide diol (MW 2000) with 2 mol 2,4,4-trimethyl-l,6-diisocyanatohexane and 2 mol HEMA (PX). ... 

More or less similar behavior has been observed (8) in the blends of the copolymer or the terpolymer with the following bis-A polycarbonate, polyvinyl chloride, poly (ethyl methacrylate), and a terpolymer made from methyl methacrylate, N,N -dimethyl acrylamide, and N-phenyl-maleimide. Because of this unique miscibility characteristic of the a-methyl styrene interpolymers, an attempt was made at compati-bilizing polyarylethers with the interpolymers by attaching pendant chemical groups known to exist in systems with which the interpolymers are miscible. 

In a subsequent investigation by the author [5], Af,A -dimethyl-s-thioben-zoylthioacetamide, (VI), was prepared as a RAFT chain transfer agent and used in the polymerization of V,A-dimethyl-acrylamide. 

The pure bulk-phase behavior was studied on blends consisting of poly(acryhc acidj/hydroxypropyl cellulose [44], poly(2-vinylpyridine)/end-sufonic acid poly(styrene) [45], and poly(acryHc acid)/poly(N,N-dimethyl-acrylamide) [46]. Goh et al. [47,48] and others [49] have studied an interesting example of [60]fullerenated poly(2-hydroxyethyl methacrylate) with poly(l-vinylimidazole) or poly(4-vinylpyridine) or poly(styrene-co-4-... 

Meldal M. PEGA a flow stable polyethylene glycol dimethyl acrylamide copolymer for solid phase synthesis. Tetrahedron Lett. 1992 33 3077-3080. 

Inui K, Okumura H, Miyata T, and Uragami T. Characteristics of permeation and separation of dimethyl acrylamide-methyl methacrylate random and graft copolymer membranes for a benzene/cyclohexane mixture. Polym Bull 1997 39 733-740. 

Copolymerization of the CD-complexed macromonomer 8a with hydrophilic comonomers 2-acrylamido-2-methylpropansulfonate (AMPS) and A,A-dimethyl-acrylamide (DMAA) leads to formation of hydrophobically associative polymers (Fig. 14) [48],... 

Two new hexahydroimidazopyrimidines [15, R =-C(Me)=CH2, R = R = H and R = H, R = -C(Me)=CH2, R - -COCH=CMe2] have been characterised by spectral and chemical methods. Additionally, 2,2-dimethyl-acrylamide and two guanidine alkaloids (see Pterogyne nitens) have been shown to be constituents of this species. 

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