Abstract
It is shown that the plateau modulus G N and entanglement molecular weight M e of poly(methyl methacrylate) are strongly dependent on tacticity, although they are independent of molecular weight and its distribution (in the absence of fractions with molecular weights below the entanglement value). Thje dependency on tacticity follows the geometric-mean (semilogarithmic) relationship with respect to diad fractions. The plateau modulus G 0 N and entanglement molecular weight M e vary from 2.4x10 6 dyn cm -2 and 16400 for pure isotactic chains to 5.3x10 6 dyn cm -2 and 7800 for pure syndiotactic chains
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