Small-angle neutron scattering by partially deuterated polymers and their blends

Partially deuterated polymers, made by saturating the double bonds of polydienes with deuterium, have been found to produce weak but significant coherent patterns in small‐angle neutron scattering (SANS) experiments. The results suggest the presence of slight differences in deuteration levels among the chains. The scattering profiles for such materials and for blends containing them were calculated with the multicomponent random phase approximation (RPA). The coherent intensity for the deuterated component alone is predicted to be proportional to the variance of its scattering length distribution and to have a q dependence corresponding to the pure component structure factor. The SANS data for a variety of partially deuterated polyolefins are shown to be consistent with these predictions. The theory also predicts that the scattering from their blends with an hydrogenous component is enhanced by this scattering length inhomogeneity, that the enhancement is additive, and that the conventional two component ...

[1]  M. Benmouna,et al.  Static scattering from multicomponent polymer and copolymer systems , 1990 .

[2]  N. Hadjichristidis,et al.  Synthesis and solution properties of linear, four-branched, and six-branched star polyisoprenes , 1974 .

[3]  G. Wignall,et al.  Small- and intermediate-angle neutron scattering from stereoregular poly(methyl methacrylate) , 1985 .

[4]  G. G. Smith,et al.  Properties of amorphous and crystallizable hydrocarbon polymers. III. Studies of the hydrogenation of polybutadiene , 1979 .

[5]  F. Bates,et al.  Thermodynamics of isotopic polymer mixtures: poly(vinylethylene) and poly(ethylethylene) , 1988 .

[6]  F. Bates,et al.  HETEROGENEOUS CATALYTIC HYDROGENATION OF POLY(VINYLETHYLENE). , 1988 .

[7]  N. Balsara,et al.  Effect of deuterium substitution on thermodynamic interactions in polymer blends , 1993 .

[8]  F. Bates,et al.  Phase behavior of amorphous binary mixtures of perdeuterated and normal 1,4-polybutadienes , 1986 .

[9]  A. Akcasu,et al.  Dynamics of copolymer and homopolymer mixtures in bulk and in solution via the random phase approximation , 1990 .

[10]  G. Wignall,et al.  Chain conformation in molten polyethylene by low angle neutron scattering , 1974 .

[11]  R. Register,et al.  Miscible blends of zinc‐neutralized sulfonated polystyrene and poly(2,6‐dimethyl 1,4‐phenylene oxide) , 1992 .

[12]  Ramanan Krishnamoorti,et al.  The compositional dependence of thermodynamic interactions in blends of model polyolefins , 1994 .

[13]  B. Hammouda.  SANS from homogeneous polymer mixtures: A unified overview , 1993 .

[14]  W. Graessley,et al.  Dimensions of polymer chains in the semicrystalline solid state , 1984 .

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