Structural Study on Aromatic Poly(amic n-alkyl ester)s and Their Derivatives by Solid-State Imidization : II. Effect of Unremoved Alkyl Chains Attached by Ether Linkage
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Rodlike aromatic copolyamides (CoPA-8), in which some octyloxycarbonyl [H(CH2)8OC(=O)-] side chains of poly(amic octyl ester) (PA-8) were substituted by octyloxy [H(CH2)8O-] groups, were prepared. In CoPA-8, the octyl side chains were attached to the main chain by ether or ester linkage. Structure of CoPA-8 before and after thermal and chemical imidization was investigated, and the results were compared with PA-8. Before the imidization, CoPA-8 formed a layered structure with alternating main-chain and side-chain segregated layers. Because the ether linkage was stable against the imidization reaction, formation of imide ring occurred only at the monomer unit having octyloxycarbonyl group. After imidization at 300deg, the octyloxy groups were removed by thermal degradation, however, the layered structure was still maintained as suggested by wide-angle X-ray diffraction pattern. Effectiveness of the octyl chains attached by ether linkage in order to maintain the layered structure has been discussed.
- Sen-ito Kogyo
Sen-ito Kogyo 64(10), 279-283, 2008-10-10
The Society of Fiber Science and Technology, Japan