【摘要】 采用红外光谱(IR)、X射线衍射(XRD)和差示扫描量热仪(DSC)从分子水平上分析了纳米羟基磷灰石/聚酰胺66生物复合材料中纳米羟基磷灰石(nHA)和聚酰胺66(PA66)之间的相互作用机理。结果表明,纳米羟基磷灰石与聚酰胺66之间主要通过氢键结合,而氢键作用主要发生在纳米羟基磷灰石的羟基和聚酰胺的仲氨基之间。氢键的方向性,削弱了PA66的β结晶取向,复合材料中PA66的结晶形态主要是α晶型。纳米羟基磷灰石和聚酰胺66之间的氢键作用,增加了成核点,起到了异相成核剂的作用,虽然加快了PA66的成核速率,但同时会使体系的粘度增加,影响PA66的有序排列而导致PA66的结晶度降低。更多还原

【Abstract】 The interaction mechanism between n-HA and PA66 in composites has been studied by IR,XRD and DSC.The results showed that n-HA and PA66 were mainly linked by hydrogen bond,and the hydrogen bond existed between hydroxyl of n-HA and amido of PA66.Orientation of the hydrogen bonds induced β-crystal to decrease,and most of the crystal in composites was α-crystal.The hydrogen bond between n-HA and PA66 increased nucleation spots and played the role of nucleating agent.Although the nucleating speed of PA66 in the composites was enhanced,the relative crystallization degree decreased because of the high viscosity of the system resulted from the addition of n-HA and the hydrogen bond between n-HA and PA66.更多还原