Summary: The size and concentration of free‐volume holes of two kinds of montmorillonite (MMT)/styrene‐butadiene rubber (SBR) nanocomposites were investigated by positron annihilation lifetime spectroscopy (PALS). Strong interfacial interaction caused an apparent reduction of the free‐volume fraction of rubber probably by depressing the formation of free‐volume holes in the interfacial region. Interfacial interaction in MMT/SBR nanocomposites was weaker than that in SBR filled with carbon black. Dependence of normalized o‐Ps intensity of four kinds of composites on filler volume fraction. image Dependence of normalized o‐Ps intensity of four kinds of composites on filler volume fraction.
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Wang et al. (2004) studied this question.
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