PCL薄膜的球晶环带结构及MWCNT对其的影响

通过溶液法制备了聚己内脂和聚己内脂/碳纳米管薄膜,研究了不同结晶温度下聚己内脂的结晶形态以及碳纳米管对聚己内酯结晶的影响.结果表明,在20～50℃较宽的温度范围内可以通过溶液结晶得到聚己内酯环带球晶,加入MWCNT使形成环带结构的温度向高温度方向拓宽.利用SEM,AFM从微观层次研究了球晶环带形成的机理.

Ring-Banded Spherulites in PCL Solution-Casting Films and Effect of MWCNT on Them

The ring-banded spherulites in poly（ε-caprolactone）（PCL）solution-casting films in the absence and presence of multi-walled carbon nanotube（MWCNT） are studied by atomic force microscopy（AFM）,polarized optical microscopy（POM）,transmission electron microscopy（TEM）,and scanning electronic microscopy（SEM）.The results indicate that birefringent ring-banded spherulites of PCL can grow from solution below 50 ℃,and the temperature is much lower than that from pure PCL melt.We also find out that the presence of MWCNT apparently widen the temperature range of forming ring-banded structure.Furthermore,the mechanism for the ringbanded structure forming is studied,and it is attributed to the twisting of lamellae crystals,and the driving force is suggested including the deflexion of lamellae bundles.