Phase behavior of poly(4‐tert‐butylstyrene‐stat‐4‐tert‐ butoxystyrene)/polyisoprene blends with competitive interactions

The phase behavior of statistical copolymers composed of (4-tert-butylstyrene) (B) and (4-tert-butoxystyrene) (O), abbreviated as s-BO, with polyisoprene (I) was investigated by optical microscopic (OM) observation and small-angle neutron scattering (SANS) measurements. It has been known that B/I blend shows lower critical solution temperature (LCST) type phase diagram, while O/I blend has upper critical solution temperature (UCST) type one. Several blends of s-BOs having mol fraction of B, mB, comparable to 0.50, with I showed both UCST and LCST type phase diagram. Furthermore, UCST type phase behavior was observed for blends having small mB, while LCST type one was for that of large mB at all used temperatures. Hence, the phase behavior of s-BO/I blend can be understood as a result of the competition of two interactions having opposite temperature dependence. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 2272–2280, 2009

[1]  Junhan Cho,et al.  Phase Behavior of Polystyrene-block-Poly(n-butyl-ran-n-hexyl) Methacrylate Copolymers , 2008 .

[2]  H. Shimizu,et al.  Upgrade of the 32 m small-angle neutron scattering instrument SANS-U , 2005 .

[3]  Yuri B. Melnichenko,et al.  Recent applications of small-angle neutron scattering in strongly interacting soft condensed matter , 2005 .

[4]  Haiqing Hu,et al.  A Closed‐Loop Phase Diagram in a Weakly Interacting Polyolefin Copolymer Binary Blend System , 2005 .

[5]  M. Harada,et al.  Novel miscible polymer blend of poly(4-trimethylsilylstyrene) and polyisoprene , 2005 .

[6]  D. Schwahn.  Critical to mean field crossover in polymer blends , 2005 .

[7]  S. Yun,et al.  Small-angle neutron scattering from symmetric blends of poly(dimethylsiloxane) and poly(ethylmethylsiloxane) , 2004 .

[8]  R. Krishnamoorti,et al.  Thermodynamic interactions in blends of poly(4‐tert‐butyl styrene) and polyisoprene by small‐angle neutron scattering , 2004 .

[9]  Unyong Jeong,et al.  Closed-Loop Phase Behavior of Polystyrene-block-poly(n-pentyl methacrylate) Copolymers with Various Block Length Ratios , 2004 .

[10]  Unyong Jeong,et al.  Phase Behavior of Deuterated Polystyrene-block-poly(n-pentyl methacrylate) Copolymers , 2003 .

[11]  T. Russell,et al.  Phase behavior of polystyrene and poly(n-pentyl methacrylate) blend , 2002 .

[12]  R. Krishnamoorti,et al.  Anomalous mixing behavior of polyisobutylene with other polyolefins , 1995 .

[13]  H. Kammer,et al.  Light-Scattering and TEM Analyses of Virtual Upper Critical Solution Temperature Behavior in PCL/SAN Blends , 1994 .

[14]  D. R. Paul,et al.  Interaction energies for blends of poly(methyl methacrylate), polystyrene, and poly(.alpha.-methylstyrene) by the critical molecular weight method , 1993 .

[15]  C. Han,et al.  Thermodynamic interactions in model polyolefin blends obtained by small-angle neutron scattering , 1992 .

[16]  I. Sanchez,et al.  Temperature, composition and molecular-weight dependence of the binary interaction parameter of polystyrene/poly(vinyl methyl ether) blends , 1988 .

[17]  J. W. Barlow,et al.  Effect of copolymer composition on the miscibility of blends of styrene-acrylonitrile copolymers with poly (methyl methacrylate) , 1987 .

[18]  J. Bendler,et al.  Thermally reversible phase separation in polystyrene/poly(styrene-co-4-bromostyrene) blends , 1986 .

[19]  F. E. Karasz,et al.  Upper and lower critical solution temperature behavior in thermoplastic polymer blends , 1986 .

[20]  H. Kammer,et al.  UCST and LCST behavior in polymer blends , 1985 .

[21]  T. Nishi,et al.  Thermally Induced Phase Separation Behavior of Compatible Polymer Mixtures , 1975 .