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

摘要

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 .%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。