Copolymers styrene/methyl acrylate

Table 1. TLC developments of styrene-methyl acrylate copolymers with single solvents...

Figure 25. Steady shear viscosity variation with shear rate for 15% styrene-methyl acrylate copolymer suspension in a 2 wt% PAA solution (171).

MAT Matsuda, H., Yamano, K., and Inagaki, H., Styrene-methyl acrylate copolymers and acrylate homopolymers in solution, J. Polym. Sci. Part A-2,1, 609, 1969. 

The relationships between the molecular mass and the composition of styrene-methyl acrylate copolymers prepared by radical polymerization in bulk were examined [47]. Experimental results agreed with polymerization kinetics for the low-conversion samples, where the chemical heterogeneity obtained by SEC was negligible. However, the methyl acrylate content for the... 

Styrene-methyl acrylate copolymers were separated on a silica gel column... 

Important copolymers of styrene are SBR (styrene butadiene rubbers), ABS, a copolymer with butadiene and acrylonitrile, and various copolymers with methacylic and acrylic esters, such as styrene-methyl methacrylate and styrene-methyl acrylate copolymers. Additionally, copolymers formed with one or more of the following monomers also exist ethylene, a-methyl styrene, vinyl acetate, maleic anhydride, and acrylonitrile. 

Fig, 9. Quaternary aromatic carbon resonance of an a-fluoro-styrene-methyl acrylate copolymer containing 48 mole percent a-fluorostyrene. Assignments for the various regions are given in Table IV,... 

Van Doremaele and co-workers [22] applied H-NMR spectroscopy to the determination of monomer ratios in styrene methyl acrylate copolymers 400-MHz H-NMR spectra were obtained in CDCI3 solutions at 25 °C. Expansions of the methoxy region display additional fine splitting due to combined configurational (i.e., tacticity) and compositional sequence effects. Mean copolymer composition (mole fraction styrene, Fj) can be readily obtained by using absorbances, which represent the total peak areas of the aromatic and methoxy proton resonances, respectively. The initial feed (q = [S]/[M]), the average copolymer composition, and the conversion are summarised in Table 4.6, [S] = concentrated styrene in feed, [M] = concentration of methyl acrylate in feed. 

Teramachi S, Hasegawa A, Shima Y, Akatsuja M, Nakajima M (1979) Separation of styrene-methyl acrylate copolymer according to chemical composition, using high-speed liquid chromatography. Macromolecules 12 992-996... 

Urban and co-workers [82] stndied the strncture of styrene-acrylic acid copolymers using attenuated total reflection Fonrier transform infrared spectroscopy. Kandu and El Gamel [83] correlated the relative intensities of the carbonyl frequencies of the methyl acrylate units in styrene methyl acrylate copolymers with copolymer composition. The positions and shapes of the carhonyl hands in the infrared absorption spectra of the copolymers dissolved in chloroform, were shown to depend on the composition of the copolymers and upon the presence of different proportions of methyl acrylate centred triads. The results obtained by infrared spectroscopy were compared with those obtained by C-NMR. Infrared spectra may be used to yield information about both the copolymer composition and the triad sequence distribution. 

Van Doremaele and co-workers [89] applied H-NMR spectroscopy to the determination of monomer ratios in styrene methyl acrylate copolymers. Figure 4.10 depicts, as a typical example, the 400 MHz H-NMR spectrum of a low-conversion solution styrene - methyl acrylate copolymer dissolved in CDCI3 at 25 °C, whereas in... 

Figure 4.11 Expanded 400 MHz H-NMR spectra of low-conversion solution styrene-methyl acrylate copolymers and homopolymer PM showing the methoxy region only. Spectra were recorded in CDCI3 at 25 °C. Copolymer compositions are indicated for each copolymer. Area measurements have been performed for the regions X, Y, and Z by using the dotted areas. Reprinted with permission from G.H.J. Van Doremaele, A.L. German, N.K. De Vries and G.P.M. Van der Velden, Macromolecules, 1990, 23, 19, 4206. 1990, ACS) [89]...

Table 4.8 Observed cumulative average copolymer compostion (Fj = mole fraction of styrene) and final conversions of some low-conversion solution styrene - methyl acrylate copolymers ...

The use of the above combination of techniques is described and results obtained for samples of PS, PMMA, styrene-methyl acrylate copolymers and functionalised PS are presented and discussed. 32 refs. 

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