METHYLSTYRENE COPOLYMER

Siloxane-acrylate copolymers Siloxane-p-methylstyrene copolymers 29 Siloxane oligomers, see reactive siloxane oligomers... 

Nagy, A., Qrszagh, I., and Kennedy, J.P. Living carbocationic copolymerizations. II. Reactivity ratios and microstructures of isobutylene/p-methylstyrene copolymers, J. Phys. Org. Chem., 8, 273, 1995. Puskas, J.E. and Paulo, C. Synthesis and Characterization of Hyperbranched Polyisobutylenes. Proceedings of the World Polymer Congress (lUPAC Macro 2000), 384, 2000. 

Fig. 6.19. Effect of polymerisation potential (Epoi) on the isoprene content mol%) of electrochemically obtained isoprene-a methylstyrene copolymers o with ultrasound without ultrasound.

Brominated isobutylene p-methylstyrene copolymer (13) FLEXON ExxonMobil... 

The formation of solid solutions appears from the X-ray diffraction spectrum for a system formed by a 1 1 (weight) mixture of isotactic polystyrene and of a styrene//>-methylstyrene copolymer (30 moles-% / -methylstyrene), obtained after melting followed by a proper annealing treatment (2). The solid solution is possible because the two different... 

Poly(isobutylene-Woc/c- -caprolactone) copolymer Poly(isobutylene-Woc/c-styrene) copolymer Poly(isobutylene-Woc/c-isobutyl vinyl ether) copolymer Poly(isobutylene-Woc/c-a-methylstyrene) copolymer Poly(isobutylene-block-methyl vinyl ether) copolymer Poly(isobutylene-b/oc/c-methyl methacrylate) copolymer... 

E. Methyl Methacrylate-Styrene and Methyl Methacrylate-oc-Methylstyrene Copolymers... 

We have carried out a preliminary study (61) of methyl methacrylate-styrene and methyl methacrylate-a-methylstyrene copolymers which indicates that high resolution NMR spectroscopy of solutions of copolymers can yield valuable information concerning both sequence lengths and stereochemical configurations of the monomer units. At the present stage of this work, however, it is not possible to disentangle sequence and configurational effects satisfactorily, and very much remains to be done. 

The spectra of the methyl methacrylate-a-methylstyrene copolymers are similar to those of the methyl methacrylate-styrene copolymers and are not shown. The backbone methylene regions (8.1—8.6t) of the two comonomer units cannot be distinguished from each other. On the other hand, the methyl methacrylate a-methyl resonances are clearly multiple except at the two lowest values of f . In the spectrum of the 46 54 methyl methacrylate-a-methylstyrene copolymer, the shape of the methyl methacrylate a-methyl resonance is markedly altered from that observed at higher f , the peak at lower field (8.83r), which corresponds to isotactic triads in the homopolymers and is normally very small in free radical polymers, appears to be the most prominent. The a-methyl protons of the a-methylstyrene units appear at highest field, 9.6r—9.8t. Peak positions for the a-methylstyrene copolymers are... 

Fig. 21. NMR peak positions tor methyl methacrylate-a-methylstyrene copolymers and homopolymers in CHQ8 or CCU (see text) as a function of / the mole fraction of methyl methacrylate in the monomerfeed open circles represent oc-methylstyrene protons filled circles represent methyl methacrylate protons...

The spectra of the methyl methacrylate-a-methylstyrene copolymers can be explained qualitatively along similar lines, but here the small differences in sequence probabilities shown in Fig. 22 do not suffice to account for the differences between these spectra and those of the nearest corresponding styrene copolymers. For instance, in the 54 46 methyl... 

Blends of syndiotactic styrene-/ -methylstyrene copolymers (SPMS) with poly(styrene)-block-poly(ethylene-co-butylene)-block-polystyrene (SEBS) has been reported. [21] No significant effects on the tensile modulus and strength were observed for blends containing less than 10% SEBS. SEM of drawn samples of the blends showed that the dispersed SEBS phase had been extended to about the same extent as the bulk blend, indicating good adhesion between the two phases. 

Styrene and a-methylstyrene copolymer in toluene, mole-% of a-methylstyrene ... 

Chung, T.C. Lu, H.L. Synthesis of poly(ethylene-co-p-methylstyrene) copolymers by metallocene catalysts with constrained ligand geometry. J. Polym. Sci. Pt. A Polym. Chem. 1997, 35, 575. 

The enantioselective copolymerization of styrenes and CO has also been achieved (Scheme 12). Using bidentate pyridine-imine ligands (26), Sen synthesized optically active styrene and 4-methylstyrene copolymers [80]. Based on a microstructural analysis, a 36% ee for olefin insertion was reported. Brookhart employed a C2-symmetrical bisoxazoline complex (27) to produce styrene-based... 

More recently, somewhat incompatible systems with a-methylstyrene copolymers, ethylene-vinylacetate resins, and paraffin wax (13) have shown exceptional hot tack although the blend is clearly incompatible. Table III shows that the adhesion increases with the cloud point of the blend. 

Piccotex . [Hocules] Vinyltoluene/al-pha-methylstyrene copolymer resins thermoplastic used in hot-melts, adhesive systems, rubber compding., specialty paint and lacquer formulations. 

Acrylonitrile) Butadiene/D -methylstyrene copolymer 1000000 Ethyl acetate 412 220... 

Styrene/D-methylstyrene copolymer (20.0 mol% Styrene) 100000 114000 Butyl acetate 288.85 453.05 181... 

The effective removal of crystallinity by the incorporation of p-MS provides the opportunity to obtain elastic properties in polyethylene copolymers. The copolymer containing 18.96 mol % of p-MS is actually an elastomer with a Tg of -5.7 °C. Further increase of p-MS concentration provides the copolymers with higher Tg and the copolymers become glassy at room temperature. Figure 7 shows DSC curves of poly(ethylene-co-p-methylstyrene) copolymers with (a) 18.98, (b) 32.8 and (c) 40 mole % p-MS, respectively. The Tg increases from -5.7 °C to 30.9 °C and to 38.8 C. The single Tg with sharp thermal transition in each case is indicative of homogeneous copolymer structure even at as high as 40 mol % of p-MS concentration. 

GL2 Glbckner, G., Francuskiewicz, F., and Reichardt, H.-U., On the behaviour of styrene-acrylonitrile copolymers in solution V. Light scattering investigation of a-methylstyrene copolymers with about 46 mol% acrylonitrile in tetrahydrofuran as a sohrsiA, Acta Polym., 30, 628, 1979. 

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