Real‐Time Observations of Oriented Crystallization of Poly(ε‐caprolactone) Thin Film, Induced by an AFM Tip
Real‐Time Observations of Oriented Crystallization of Poly(ε‐caprolactone) Thin Film, Induced by an AFM Tip
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DOI：
10.1002/macp.200700208
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发表时间：
2007-09
影响因子：
2.5
通讯作者：
M. Fujita;Y. Takikawa;Hirotaka Sakuma;S. Teramachi;Y. Kikkawa;Y. Doi
中科院分区：
文献类型：
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作者：
M. Fujita;Y. Takikawa;Hirotaka Sakuma;S. Teramachi;Y. Kikkawa;Y. Doi
采用原子力显微镜（AFM）对聚e-己内酯（PCL）薄膜的表面结构进行了修饰。用强载荷扫描诱导PCL晶体在薄膜表面的特定区域定向生长。PCL晶体首先在诱导线上沿边生长，然后在片层长度上改变取向为平晶。考察了分子量、结晶温度、扫描速率和正常负载对原子力显微镜尖端诱导结晶的影响。原子力显微镜尖端诱导晶化过程中片层晶体的生长动力学与球晶晶化过程相同。研究发现，前驱体的形成强烈依赖于施加的尖端载荷，当施加的载荷高于阈值时，前驱体的形成更容易。
Atomic force microscopy (AFM) was used for modifying the surface structures of poly(e-caprolactone) (PCL) thin film. Oriented growth of PCL crystals at a desired area of the film surface was induced by scanning with a strong, normal load. PCL crystals were first grown edge-on from the induction line and then their orientation changed to flat-on at a lamellar length. The effects of molecular weight, crystallization temperature, scanning rate, and normal load on the AFM-tip-induced crystallization were examined. The growth kinetics of lamellar crystals in the AFM-tip-induced crystallization was the same as that in spherulitic crystallization. It was found that the formation of precursors strongly depends on the applied tip load and is facilitated when the applied load is higher than a threshold.