Abstract
Poly(vinylethylene) (PVE) and polyisoprene (PIP) do not chemically interact; nevertheless, miscibility extends to infinite molecular weight of the components, indicating that the interaction parameter for the blend is negative. This inference has been directly demonstrated by small angle neutron scattering, which showed, moreover, that the negative sign has an enthalpic origin. The present solid state nuclear magnetic resonance (NMR) cross-polarization/dipolar dephasing results are consistent with a greater degree of spatial intimacy between PVE and PIP chains in the blend relative to the neat polymers. The greater intimacy suggested by the NMR results is consistent with stronger van der Waals bonding in the blends, and hence the negative mixing enthalpy.
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