A series of copolyimines from terephthalaldehyde and 1,8-diaminooctane and 1,10-diaminodecane is synthesized. X-ray diffraction and cross-polarized microscopic studies reveal that all the copolyimines exhibit a liquid crystalline smectic phase as does one of the parent homopolyimines, PIt0. The transition temperatures and the associated enthalpy and entropy change continuously as functions of copolymer composition. The crystalline and liquid crystalline phases of the copolyimine series are isomorphic. The copolyimines are soluble in chloroform and tetrahydrofuran.
Посилання на статтю:
Polyimines from terephthalaldehyde and aliphatic diamines: 5. Copolymers with even-even numbers of methylene units in the flexible spacer / Haixin Yang and Almeria Natansohn* // Polymer. – 1993. – Vol 34. – P. 4135-4139.