分别以氮化硼（BN）、BRUGGOLENP250、CaCO3和Tm-3为成核剂,用熔融模压法制备了聚（3-羟基丁酸酯-co-4羟基丁酸酯）[P（3HB-co-4HB）]样品,借用偏光显微镜（POM）、差示扫描量热（DSC）、热重分析（TGA）和扫描电镜（SEM）等考察了成核剂种类及用量对P（3HB-co-4HB）结晶形态、熔点、热分解温度、力学性能及断面形态的影响。结果表明,各种成核剂均能有效细化P（3HB-co-4HB）的球晶尺寸,提高其熔点及热分解温度;当成核剂BN的质量分数为5‰~8‰时,P（3HB-co-4HB）的综合性能最好。
Poly（3-hydroxyllbutyrate-co-4-hydroxylbutyrate） [P（3HB-co-4HB）] with nucleating agents BN,P250,CaCO3 and Tm-3 respectively were prepared via melt molding.Polarizing microscope（POM）,differential scanning calorimetry（DSC）,thermogravimetric analysis（TGA） and scanning electron microscope（SEM）,etc were used to characterize the effects of type and dosage of nucleating agents on the spherulitic morphology,melting point,thermal decomposition temperature,mechanical properties and fracture morphology of the samples.The results show that nucleating agents can effectively refine the spherulite,improve the melting point and thermal decomposition temperature of the P（3HB-co-4HB）.The comprehensive properties of the P（3HB-co-4HB） are optim μm with BN as nucleating agent at 5‰～8‰.
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