中文摘要：

本工作采用混合强酸H2SO4∶HNO3（V∶V）=3∶1活化多壁碳纳米管,结合超声分散技术,利用溶液浇铸法制备多壁碳纳米管（MWCNT）和聚羟基丁酸戊酸酯（PHBV）复合材料。场发射扫描电镜观察MWCNT和MWCNT/PHBV的表面形貌,DSC和XRD研究了PHBV的结晶热力学行为。酸化处理后的碳纳米管长径比变小,粒径趋于均匀,可以比较均匀地分散在PHBV中。DSC和XRD结果显示,碳纳米管在PHBV结晶过程中起异相成核作用,加入碳纳米管后,PHBV的晶型不发生改变,MWCNT/PHBV的结晶温度和结晶焓升高,结晶速率和热稳定性提高。

英文摘要：

H2SO4/HNO3 （v/v ： 3 ： 1） solution was used to activate MWCNT. Poly （hydrobutyrate-co-hydroxyvalerate） （PHBV） and multi-walled carbon nanotubes （MWCNT） blended films were prepared by conventional solvent-casting technique. Ultrasonic energy was explored to enhance dispersion of MWCNT in PHBV matrix. Field emission microscope was used to observe the morphology of treated and untreated MWCNT powder and acidified MWCNT/PHBV composites. It revealed that length/diameter ratio and grain diameter prior to small and uniform, respectively. MWCNT dispersed in PHBV matrix homogeneously. The thermal properties and crystallization behaviors of the composites were measured by differential scanning calorimetry and X-ray spectrum. The results indicate the nucleation effect of MWCNT. And there is no significant change in crystals. With the addition of MWCNT, crystallizing point and crystallization heat are increased; crystallization rates and thermal stability of PHBV are accelerated as well.