The solid state polymorphism of poly[oxydodecanedioyloxy-1,4-phenylene-(2-methylvinylene)1,4-phenylene], a mesophasic polymer, has been investigated by X-ray and electron diffraction methods. The polymer shows two crystal phases apparently equally stable at room temperature. One is obtained by solution crystallization, the other by melt crystallization or by annealing the polymer within an appropriate range of temperatures. Two additional crystal phases are observable at high temperatures. The unit cell parameters of all the observed crystal forms have been determined. © 1980.
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