纳米羟基磷灰石/聚酰胺66仿生复合材料的非等温结晶动力学研究

用差示扫描量热仪(DSC)研究了不同比例的纳米羟基磷灰石(nano hydroxyapatite, n HA)/聚酰胺66(polyamide 66,PA66)仿生复合材料的非等温结晶行为。结果表明:(1)纳米羟基磷灰石的加入,起到了异相成核剂的作用,提高了PA66 的结晶速率,且结晶速率随纳米羟基磷灰石的含量的增加而增加,纯PA66的结晶度则随着纳米羟基磷灰石的增加而降低。(2)PA66 和复合材料的结晶峰都随降温速率的增加从高温向低温方向移动,且结晶峰变宽。(3)以Mo法进行非等温结晶数据处理,得到的F(T) 随结晶度的增加而增加,a值却几乎不随结晶度变化,表明降温速率越快,单位结晶时间达到的结晶度越高,但各降温速率下的结晶方式基本相同。

The study of nonisothermal crystallizing kinetics for nano-hydroxyapatite/polyamide 66 composites

The nonisothermal crystallization kinetics of pure PA66 and n-HA/PA66 composites with 30wt%,40wt% of nano-hydroxyapatite (n-HA) respectively has been studied by means of differential scanning calorimeter(DSC).The results showed that:(1)The addition of n-HA in PA66 played a role of nucleating agent and enhanced the crystallization growth rate.The more of n-HA in the composites, the faster of the crystallization growth rate.However,more nano-hydroxyapatite in the composites would strengthen the interface action and make polyamide 66 molecules to crystallize,which induced the relative crystallization degree to decrease.(2)The crystallizing curves of pure PA66 and n-HA/PA66 composites moved from higher temperature to lower temperature with the increase of cooling rate,and the width of crystallizing peak became larger.(3) Mo method applied to deal with the nonisothermal data could get good linear relation between F_((T))and a.For the same composite,the value of a was almost the same at different relative crystallization degree,and the values of F_((T)),however,decreased with the increase of the relative crystallization degree,indicating the crystallizing rate became greater in the unit time with the increase of cooling rate,but the trend of crystallizing was almost the same at different cooling rate.