Small-angle neutron scattering (SANS) experiments were performed on blends of deuterated and nondeuterated copolyesters of poly(ethy1ene terephthalate) (PET) and poly@-hydroxybenzoic acid) (PHB). The PET content varied between 80 and 60 mol % , the sample containing 60 mol ' ?6 being liquid crystalline. Depending on the time of melting during sample preparation, transesterification took place to various degrees resulting in samples in which the molecules contained deuterated and nondeuterated blocks of various lengths. The average degree of polymerization and radius of gyration of these blocks were measured and the length of the statistical element b was calculated as a function of composition. The transition from the amorphous to the liquid-crystalline state did not lead to an additional increase in b. From this it was concluded that, in the nematic state, the molecules are not elongated. From the length of the statistical element, the average degree of polymerization of the PHB sequences could be estimated.

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