Poly-t-butylstyrene

Various substituted styrene-alkyl methacrylate block copolymers and all-acrylic block copolymers have been synthesized in a controlled fashion demonstrating predictable molecular weight and narrow molecular weight distributions. Table I depicts various poly (t-butylstyrene)-b-poly(t-butyl methacrylate) (PTBS-PTBMA) and poly(methyl methacrylate)-b-poly(t-butyl methacrylate) (PMMA-PTBMA) samples. In addition, all-acrylic block copolymers based on poly(2-ethylhexyl methacrylate)-b-poly(t-butyl methacrylate) have been recently synthesized and offer many unique possibilities due to the low glass transition temperature of PEHMA. In most cases, a range of 5-25 wt.% of alkyl methacrylate was incorporated into the block copolymer. This composition not only facilitated solubility during subsequent hydrolysis but also limited the maximum level of derived ionic functionality. 

Polystyrene-block-poly(t-butylstyrene) Aliphatic hydrocarbon Polystyrene... 

Michael addition Organo[Pg.777]

As seen from the above examples, most of these hydrophobe modification processes involve introducing a hydrophobe onto a water soluble polymer (WSP) backbone. However, Bock and Valint [30] have reversed the process they have added solubilizing ionic moieties to a hydrophobic block copolymer, poly(t-butylstyrene-h-styrene), backbone by selective sulfonation of the polystyrene block (Scheme 1.5). The resulting material is a novel hydrophobically associating block copolymer. 

Similarly, poly-Cf-methylstyrene is miscible with PMMA, PEMA, PBMA, and PCHMA. Poly-p-methylstyrene, and poly-p-t-butylstyrene show miscibility with polyalkyl(meth)acrylates. However, PS is immiscible with PMMA, PMA, polyethylacrylate (PEA), polybutylacrylate (PBA), or PBMA [Somani and Shaw, 1981],... 

Figure 3.4. Illustration of phase inversion during polymerization (Molau, 1965). Electron micrographs (transmission) of thin sections of a graft copolymer of p-t-butylstyrene with polystyrene (90/10). (a) Polymerized to 5.3 % conversion before the inversion point. The poly(p-t-butylstyrene) phase is white, and the polystyrene phase is black, (b) Polymerized to 7.8% conversion phase inversion is just beginning to occur, (c) The same system polymerized to 13.3% conversion after the phase inversion point.

Storage and loss moduli, G and G" and the dielectric loss, e" of a high-M PI99/PtBS348 miscible blend (Mpi = 9.9 x 10, Mpi g = 3.5 x 10 , w i = 50 wt%) measured at temperatures as indicated. The e" data are multiplied by a factor of 10. (Data taken, with permission, from Watanabe, H., Q. Chen, Y. Kawasaki, Y. Matsumiya, T. Inoue, and O. Urakawa, 2011. Entanglement dynamics in miscible polyisoprene/poly(p-ferf-butylstyrene) blends. Macromolecules 44 1570-1584.)... 

Test of time-temperature superposabillty for the dielectric P data of low-M and middle-M poly-isoprene/poly(p-feri butyl styrene) (PI/PtBS) miscible blends as indicated. In panels (a)-(d), the sample code numbers of the blends denote Kh M of the components. The reference temperature is T, = 90°C for aU blends. The solid curves indicate the e" data of bulk PI corrected for the PI volume fraction in the blends. These curves are shifted along the axis to match their peak frequency with that of the blends. (Etata taken, with permission, from Chen, Q., Y. Matsumiya, Y. Masubuchi, H. Watanabe, and T. Inoue. 2008. Component dynamics in polyisoprene/ poly(4-tert-butylstyrene) miscible blends. MacrvmoJeades 41 8694-8711 Chen, Q., Y. Matsumiya, Y. Masubuchi, H. Watanabe, and T. Inoue. 2011. Dynamics of polyisoprene-poly(p-tert-butylstyrene) diblock copolymer in disordered state. Macnmiolecules 44 1585-1602 Chen, Q., Y. Matsumiya, K. Hiramoto, and H. Watanabe. 2012. Dynamics in miscible blends of polyisoprene and poly(p-terf-butyl styrene) Thermo-rheological behavior of components. Polymer ]. 44102-114.)... 

Chen, Q., Y. Matsumiya, Y. Masubuchi, H. Watanabe, and T. Inoue. 2008. Component dynamics in polyisoprene/poly(4-tert-butylstyrene) miscible blends. Macromolecules 41 8694 711. 

Watanabe, H., Q. Chen, Y. Kawasaki, Y. Matsumiya, T. Inoue, and O. Urakawa. 2011. Entanglement dynamics in miscible polyisoprene/poly(p-fcrf-butylstyrene) blends. Macromolecules 44 1570-1584. 

Poly(maleic anhydride-o/t-tert-butylstyrene)-g-poly(ethylene glycol) ... 

IRA Irani, C.A. and Cozewith, C., Lower critical solution temperature behavior of ethylene-propylene copolymers in multicomponent solvents, J. Appl. Polym. Sci., 31,1879, 1986. 86KUE Kuecuekyavruz, Z. and Kuecuekyavruz, S., Theta-hehaviour of poly(p-tert-butylstyrene)-b-poly(dimethylsiloxane)-h-poly(p-tert-hutylstyrene), M A rowo/. Chem., 187, 2469, 1986. 86RAE Raetzsch, M.T., Kehlen, H., Browarzik, D., and Schirutschke, M., Cloud-point curve for the system copoly(ethylene-vinyl acetate) + methyl acetate. Measurement and prediction by continuous thermodynamics, J. Macromol. Sci.-Chem. A, 23, 1349, 1986. 

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