功能化氧化石墨/聚羟基丁酸酯纳米复合材料的制备与性能研究

Preparation and Characterization of Functionalized Graphite Oxide /Poly( 3-hydroxybutyrate) Nanocomposites

采用溶液插层技术制备功能化氧化石墨/聚羟基丁酸酯纳米复合材料(MGO/PHB),利用红外光谱分析(FTIR)和原子力显微镜(AFM)对MGO的表面结构进行表征,并用扫描电子显微镜(SEM)、X射线衍射(XRD)、示差扫描量热仪(DSC)及拉伸试验分别对MGO/PHB的微观形貌、结晶性能及力学性能进行分析测试。结果表明:MGO的加入加速了PHB基体的结晶并导致结晶度增大;氧化石墨经表面功能化处理后,改善了MGO片在PHB基体中的均匀分散以及其与PHB基体的界面相互作用;随着MGO质量分数的增加,复合材料的断裂强度先降低后增大,而与纯PHB相比,复合材料都表现出更高的断裂模量值,但复合材料的力学性能变化与MGO添加量的阀值有一定关系。

Functionalized graphite oxide （MGO）/Poly（3-hydroxybutyrate） （PHB） nanocomposites with excellent thermal and mechanical properties were prepared via a facile solution intercalation method .The surfacial structure of MGO was characterized by u-sing FTIR and AFM.The morphology, crystalline and mechanical properties of the MGO/PHB nanocomposites were investigated by u-sing SEM, XRD, DSC and tensile test.The results indicated that the crystallization process was accelerated , leading to an increase in crystallinity.The surfacial interactions between MGO and PHB were improved effectively through chemical functionalization of MGO , leading to even dispersion of MGO in the PHB during solution blending .With the increase in MGO content , the flexural strength of MGO/PHB nanocomposites increased firstly , followed by decreasing .However , all MGO/PHB nanocomposites showed higher flexural modulus , compared with pure PHB .The variation of mechanical strength with the loading of MGO in the nanocomposites showed some -what correlation with the threshold filler concentration .