New Block Copolymers Based on Rigid-
and Flexible-Chain Polyheteroarylenes¹

O. G. Nikol’ski*, I. I. Ponomarev**², N. S. Perov*, V. A. Martirosov*,
E. S. Obolonkova*, Yu. A. Volkova**, A. L. Rusanov**, and S. V. Vinogradova**

* Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences,
ul. Profsoyuznaya 70, Moscow, 117393 Russia

** Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences,
ul. Vavilova 28, Moscow, 119991 Russia

Received September 15;
Revised Manuscript Received December 10, 2003

Abstract—For the mechanical blend of a rigid-chain poly(naphthoyleneimidobenzimidazole) and a flexible-
chain poly(phenylquinoxaline) and a series of new soluble block copolymers based on them, the structure and
mechanism of phase separation were studied by relaxation spectrometry, structural–morphological analysis,
and thermogravimetry. It was shown that in the case of copolymers, in contrast to the fully incompatible
mechanical blend, a partial or complete compatibility of the components exists, depending on the ratio and size
of blocks, which is primarily associated with the effect of copolymerization. For partially compatible copoly-
mers, the composition of mixed phases was determined and the possibility of formation of anisometric particles
was demonstrated. Heat-resistant film materials with good mechanical characteristics were prepared based on
block copolymers.

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