Porod scattering study of coarsening in immiscible polymer blends

Studies of immiscible blend compatibilization often involve laborious microscopy methods to characterize changes in the particle size distribution with time in the melt. Here we explore a simple alternative approach based on Porod scattering from the two-phase structure. Although micron-sized particles in immiscible polymer blends are too large to be fully characterized by small-angle scattering, Porod scattering measurements of the interfacial area combined with knowledge of the blend volume fraction allows determination of an average particle diameter from a single scattering measurement. This technique is illustrated in experiments monitoring coarsening of particle size in polystyrene/poly(methyl methacrylate) blends prepared either by melt blending or solid-state shear pulverization. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 3413–3420, 2005

[1]  Sotiris E. Pratsinis,et al.  Structure of Flame-Made Silica Nanoparticles by Ultra-Small-Angle X-ray Scattering , 2004 .

[2]  T. Russell,et al.  Intercalibration of small-angle X-ray and neutron scattering data , 1988 .

[3]  G. Kostorz,et al.  Generalization of Porod's law of small-angle scattering to anisotropic samples , 2000 .

[4]  R. Roe,et al.  Methods of X-ray and Neutron Scattering in Polymer Science , 2000 .

[5]  J. Torkelson,et al.  In Situ Block Copolymer Formation during Solid-State Shear Pulverization: An Explanation for Blend Compatibilization via Interpolymer Radical Reactions , 2002 .

[6]  C. Macosko,et al.  Block copolymer compatibilizers for polystyrene/poly(dimethylsiloxane) blends , 2002 .

[7]  G. C. Gemeinhardt,et al.  Characterization of Ionomer-Compatibilized Blend Morphology Using Synchrotron Small-Angle X-Ray Scattering , 2005 .

[8]  Eric D. Siggia,et al.  Late stages of spinodal decomposition in binary mixtures , 1979 .

[9]  P. W. Schmidt,et al.  Small-angle scattering studies of disordered, porous and fractal systems , 1991 .

[10]  Harold D. Bale,et al.  Small-angle X-ray-scattering investigation of submicroscopic porosity with fractal properties , 1984 .

[11]  John M. Torkelson,et al.  Sub-micron dispersed-phase particle size in polymer blends: overcoming the Taylor limit via solid-state shear pulverization , 2003 .

[12]  Robert H. Bragg,et al.  Small‐angle scattering of x rays from groups of nonrandomly oriented ellipsoids of revolution of low concentration , 1974 .

[13]  Philippe Guégan,et al.  Compatibilizers for Melt Blending: Premade Block Copolymers† , 1996 .

[14]  F. Mirabella,et al.  Ostwald ripening in immiscible polyolefin blends , 1995 .

[15]  R. Prud’homme,et al.  SAXS Measurements of Interfacial Thickness in Amorphous Polymer Blends Containing a Diblock Copolymer , 1994 .

[16]  Smith,et al.  Surface areas of fractally rough particles studied by scattering. , 1989, Physical review. B, Condensed matter.

[17]  J. Torkelson,et al.  Novel Strategy for Polymer Blend Compatibilization: Solid-State Shear Pulverization , 2000 .

[18]  J. Torkelson,et al.  Stabilization of dispersed phase to static coarsening: Polymer blend compatibilization via solid-state shear pulverization , 2002 .

[19]  Souheng Wu.  Formation of dispersed phase in incompatible polymer blends: Interfacial and rheological effects , 1987 .

[20]  S. Carr,et al.  Trace levels of mechanochemical effects in pulverized polyolefins , 2001 .

[21]  Christopher W. Macosko,et al.  Drop Breakup and Coalescence in Polymer Blends: The Effects of Concentration and Compatibilization , 1995 .

[22]  G. Beaucage,et al.  Morphology of Polyethylene-Carbon Black Composites , 1999 .

[23]  G. Beaucage,et al.  Particle size distributions from small-angle scattering using global scattering functions , 2004 .

[24]  F. Boué,et al.  Foams As Viewed by Small-Angle Neutron Scattering , 2003 .

[25]  J. Torkelson,et al.  Coarsening effects on microstructure formation in isopycnic polymer solutions and membranes produced via thermally induced phase separation , 1994 .

[26]  S. Lyonnard,et al.  Analysis of the small-angle intensity scattered by a porous and granular medium , 2003 .