METHACRYLIC ACID POLYMER

Melt Viscosity. As shown in Tables 2 and 3, the melt viscosity of an acid copolymer increases dramatically as the fraction of neutralization is increased. The relationship for sodium ionomers is shown in Figure 4 (6). Melt viscosities for a series of sodium ionomers derived from an ethylene—3.5 mol % methacrylic acid polymer show that the increase is most pronounced at low shear rates and that the ionomers become increasingly non-Newtonian with increasing neutralization (9). The activation energy for viscous flow has been reported to be somewhat higher in ionomers than in related acidic... 

Methacrylic acid polymer is iasoluble ia the monomer, which may result ia the plugging of transfer lines and vent systems. Polymers of the lower alkyl esters are often soluble ia the parent monomer and may be detected by an iacrease ia solution viscosity. Alternatively, dilution with a nonsolvent for the polymer such as methanol results ia the formation of haze and can be used as a diagnostic tool for determining presence of polymer. 

Polymers of methacrylic acid or maleic acid, either alone or as a blend or copolymer with the sulphonated aryl-formaldehyde condensation products, have also been evaluated as stain-blocking chemicals [508,509]. An interesting development is the use of a polystyrene-maleic acid copolymer, this being unusual because of the absence of sulphonic acid groups [508,510]. Although the maleic and methacrylic acid polymers do not have the durability of the conventional syntans, they have the advantage that they are non-yellowing. 

Polyvinyl methyl ether and polymers of acrylic and methacrylic add are also water-soluble. Because of salt formation in the polymers, the acrylic and methacrylic acid polymers, as well as CMC, are more soluble in alkaline solutions than they are in water. 

The freeze/thaw (F/T) stability of a polymer emulsion serves as a macroscopic probe for investigating the properties of the average particle in a polymer emulsion. A review of the factors which contribute to this stability is included. A study of styrene-ethyl acrylate-methacrylic acid polymers shows the existence of a minimum in the plot of minimum weight percent acid required for F/T stability vs. the minimum film formation temperature (MFT) of the polymer. This is considered to be a function of both the amount of associated surfactant and the minimum acid content. Thus, both the type of surfactant and the copolymer ratio—i.e., MFT—play major roles. Chain transfer between radicals and polyether surfactant resulting in covalently bonded surfactant-polymer combinations is important in interpreting the results. 

Amberlite IRP-88 methacrylic acid polymer with divinylben-zene, potassium salt polacrilinum kalii. 

Synonyms Amberlite IRP-64 methacrylic acid polymer with divinylbenzene 2-methyl-2-propenoic acid polymer with divinylbenzene. 

Swift G and Herman F. Mark. Acrylic (and methacrylate) acid polymers. In Encyclopedia of Polymer Science and Technology. John Wiley Sons [ONLINE] Volume 1. p 79-96 2002. 

Methacrylic acid, 2-phenoxyethyl ester. See 2-Phenoxyethyl methacrylate Methacrylic acid polymer with divinyl benzene, potassium salt. See Polacrilin potassium Methacrylic acid, tetrahydrofurfuryl ester. See Tetrahydrofurfuryl methacrylate Methacrylic acid, 3-(trimethoxysilyl) propyl ester. See3-... 

The ability of thiol-ene click chemistry to retain high efficiency under the most benign reaction conditions was exempHfied by Ritter and Bardts, in the preparation of hydrogels based on methacryhc acid [224]. In this study, poly(methacrylic acid) polymers were modified with cysteamine and aUyl amine to afford complementary thiol-ene reactive polymer chains. Solutions of the polymer pairs in water were mixed in the presence of a radical initiator, and the formation of a highly elastic gel was observed within only 2 h at room temperature. The authors noted that this approach might have broad application for a rapid and straightforward access to hydrogel materials for which the properties could easily be tailored by the choice of the amine modifiers. 

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