Poly methylacrylate

Beaded methacrylate polymers, poly(hydroxyethylmethacrylate), Spheron, Separon (29), and poly(glycidylmethacrylate), Eupergin (30,31), are studied extensively at the Czechoslovak Academy of Macromolecular Sciences. An addition to this type of support is poly(oxyethylene-dimethacrylate) (32). Heitz et al. (33) described the preparation of beaded poly(methylacrylates) cross-linked with ethanedimethacrylates. 

Fig. 34. Specific volume-temperature curves at different pressures for the poly(methylacrylate) (isobaric measurements)...

Fig. 35. Examination of the validity of the Ehrenfest equations for the glass transition of the poly-(methylacrylate) shown in Fig, 34...

Wizel later extended her study and included another metallic nanopartide, cobalt, and an additional polymer, poly(methylmethacrylate), in her metal-polymer composite research [58]. A significant difference in the solubility of the iron-poly(methylacrylate) and cobalt-poly(methylacrylate) in various solvents was observed. While the iron-poly(methylacrylate) composite (FePMA) and iron-poly(methylmethacrylate) composite (FePMMA) dissolved in chloroform, acetone, and toluene at room temperature, the corresponding cobalt-poly(methylacrylate) composite (CoPMA) was insoluble in these solvents at room temperature. At elevated temperatures (45 °C), dissolution of CoPMA in these solvents was observed. This difference is accounted for by the stronger interaction existing between the cobalt and the surrounding polymer. For iron-poly(methylacrylate) this interaction is weakened due to the formation of an iron complex. The Mw of the various polymers and composites as a function of the metal-to-monomer weight ratio was measured and reported. 

If poly methylacrylate is irradiated at 77°K, a complex spectrum is obtained (Fig. 16), where that due to methyl radicals is apparent [104]. If... 

Stepwise decay in poly methylacrylate irradiated at 77° K has been reported [220, 255]. 

The above reactions probably proceed through the excited triplet state of the acetate group as with low molecular weight model compounds [91]. It can be concluded that a mechanism similar to that proposed for the photolysis of poly methylacrylate (see section 5) does not account for more than 3% of the total yield of main chain reactions in the photolysis of poly vinylacetate [13]. 

A typical plot of 1/P against T/n is shown in Figure 26, leading to computation of rotational relaxation times given In Table 6 (81) for various polymers and fluorescent probes. It is evident that with probes derived from anthracene and 9-methylanthracene on the ends of chains, relaxation is too rapid for accurate measurement. More recently, results have been obtained that indicate that the rotational relaxation time for an anthracene molecule incorporated in a terminal site in poly(styrene) is 0.86 nsec, compared with that in a site within the chain of 4.7 nsec (83). While the method is applicable to relatively immobile methacrylate and styrene-based polymers, again relaxation times were too short for the more flexible polymers such as poly-(methylacrylate) and poly(vinylacetate). 

Drzewinski, M. A. Blends of polycarbonates containingfluorinated-bisphenol A and poly(methylacrylate). US Patent. 5,292,809, (1994). 

Blends of poly(methacrylic acid) or polystyrene with epoxidised linseed oil are prepared in solution by mechanical mixing in dimethyl sulphoxide (DMSO) or tetrahydrofuran (THF) to improve the performance of the individual components. However, blends of poly(methylacrylic acid) are not able to produce compatible systems, although different compositions (15-55 wt%) of polystyrene blends will form miscible blends. The results show an improvement in properties, including biodegradation of the miscible blends, and the systems are comparable with low density polyethylene. 

Zheng, X., et al. 2015. Antifouling property of monothiol-terminated bottle-brush poly (methylacrylic acid)-graft-poly(2-methyl-2-oxazoline) copolymer on gold surfaces. Journal... 

FIGURE 13.7 Tapping mode AFM phase images of polymer thin films (a) poly(3-hexylthiophene) (b) poly(3-hexylthiophene)-b-polystyrene (c) poly(hexylthiophene)-fc-poly(butylacrylate) (d) poly(3-hexylthiophene)- -poly(methylacrylate) (e) poly(3-dodecylthiophene-ran-3-methylthiophene). Reprinted with permission from [83], Copyright 2006 American Chemical Society. 

Voyutskii [87] has shown some electron micrographs of the interfaces of poly-methylacrylate-PVC and polybutylmethacrylate-PVC prepared at 210-220°C. Mixing at the interface was much greater with the first pair. 

Figure 5.8 shows the temperature dependence of the relaxation rate in an Arrhenius-plot. The data were obtained in several experiments on polyacrylates and poly(methylacrylates) with pendant cyclohexyl groups. The linearity of the plot is indicative of an activated process, the relaxation time being given by the Arrhenius law... 

Aciyloyl-L-prolinemethyl ester Copolymers of N-isopropyl aciylamide and butyl methacrylate" Copolymers of aciyloyl-L rolinemethyl ester and Itydroxyethyl methacrylate (xjpolymers of acryloyl-L-prolinemethyl ester and hychxixypropyl methacrylate" IPNs of poly(ethylene oxide) and poly(acryloyl pyrrolidone)" IPNs of poly(tetramethylene ether glycol) and poly(N-isopropyl acrylamide)" Association complexes of poly(methylacrylic acid) and poly(ethylene oxide)" 24... 

A typical example referring to frequency domain measurements is shown in Figure 1.11, where e", recorded with poly(methylacrylate) at various temperatures, is plotted as a function of frequency. The two peaks, related to a relaxation (low-frequency) and relaxation (high-frequency) are shifted to higher frequencies with increasing temperature (details of this phenomenon were outlined in Section 1.1.2.2). It should be noted that the a-relaxation is... 

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