Abstract: In this study，the nanocomposites based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3,4)HB) and organically-modified layered α-zirconium phosphate(OZrP) were prepared by solution intercalation. The micro-structure，thermal properties，crystallization behavior and degradation properties of P(3,4)HB and its nanocomposites were investigated by XRD ，SEM，TGA，DSC and POM. The crystal properties of P(3,4)HB were greatly improved，which indicated that a small amount of OZrP (3%) dispersed at nanoscale in P(3,4)HB matrix could act as nucleating agent and facilitate crystallization of polymer by heterogeneous nucleation. Degradation experiment results showed that OZrP could improve degradability of P(3,4)HB. In addition，OZrP could reduce thermostability of P(3,4)HB.

Key words: poly(3-hydroxybutyrate-co-4-hydroxybutyrate), α-zirconium phosphate, biodegradability, composites, nucleation

摘要： 以可生物降解聚（3-羟基丁酸酯-co-4-羟基丁酸酯）[P(3,4)HB]为基体，有机改性层状化合物?-磷酸锆（OZrP）为增强相，采用溶液插层法制备了P(3,4)HB/OZrP纳米复合材料。分别用X射线衍射仪（XRD）、扫描电镜（SEM）、偏光显微镜（POM）、热重分析仪（TGA）和差式扫描量热仪（DSC）等对其微观结构、热稳定性、结晶行为及降解性能进行了表征与分析。研究表明，具有纳米片层结构的OZrP能均匀分散在P(3,4)HB基体中形成纳米复合结构，OZrP能通过异相成核作用促进P(3,4)HB的结晶，并能促进P(3,4)HB的降解，但降低P(3,4)HB 的热稳定性。

关键词: 聚（3-羟基丁酸酯-co-4-羟基丁酸酯）, α-磷酸锆, 可生物降解性, 复合材料, 成核