A series of polyesters PBSBS

Poly(butylene succinate—co-butylene phenylsuccinate)

were synthesized from the polycondensation of succinic acid and phenylsueeinic acid with 1

4-butanediol．The compositions and thermal properties of resulted homopolyesters and copolyesters were investigated by 1H—NMR

differential scanning calorimetry(DSC)and X-ray diffraction．The results suggested that the introduction of the comonomer containing a phenyl side-group led to a change in thermal properties and crystallization behavior．The glass transition tomperature increased with the increasing of the comonomer composition

while the equihbrium melting temperature obtained by the Hoffman—Weeks plot decreased significantly．Furthermore

an Avrami method was used to analyze the kinetics of isothermal crystallization of PBS and PBSBS-10．The Avrami exponents

estimated by Avrami plots

ranging from 2．8 to 3．0 for PBS and 2．7 to 2．9 for PBSBS-10

indicated that the mechanism of crystallization for both homopolyester and copolyester was a tridimensional growth with heterogeneous nucleation．Meanwhile

X-ray diffraction showed that there was almost no effect of the phenyl succinate unit on the crystal structure．