The crystallization kinetics and mechanisms of phase transitions for sequential block copoly-mers synthesized through polycondensation of the mesogenic group 2-methyl-p-phenylene di(4-chloroformyl) benzoate

1

10-decanediol (B) and poly (oxytetramethylene) glycol (C) have been investigated by using DSC

PLM

and WAXD. As a feed ratio of B/C( 10/90

20/80

40/60

50/ 50

wt%)

the values of Avrami exponent are n≈2 at all the feed ratios. The crystallization from isotropic melt experienced the stage of mesophase period.The crystallization either from isotro-pic melt or from mesophase has the same mechanism including nucleation through aggregation of orientational segments and the two dimensional crystal growth. The flexible block of poly(oxyse-tramethylene) glycol has a significant influence on the structure formation. It is worth to indi-cate that ca. the ratio 20/80 there a lower Bk value and a larger entropy change △Si during me-sophase to isotropic melt transition.