CAJ | 학술논문

将星形支化结构的聚己内酯,包括六臂星形聚己内酯(HPCL)和树枝状星形聚己内酯(DPCL),以及线形聚己内酯(LPCL)室温旋涂于云母片上,通过原子力显微镜(AFM)观察分子结构对星形支化聚己内酯超薄膜的润湿-去润湿性质的影响.在旋涂过程中,薄膜的形成受去润湿和结晶竞争的控制.差示扫描量热(DSC)测试结果表明,当相对分子质量相同时,结晶性的顺序是:DPCL最弱,HPCL次弱,LPCL最强.依据分子结构和相对分子质量的影响,即去润湿和结晶竞争的结果,LPCL、HPCL和DPCL的超薄膜表现出不同的表面形态,包括尺寸不同的完整的球晶、开口的球晶、树枝状片、分散的颗粒.
장성형지화결구적취기내지,포괄륙비성형취기내지(HPCL)화수지상성형취기내지(DPCL),이급선형취기내지(LPCL)실온선도우운모편상,통과원자력현미경(AFM)관찰분자결구대성형지화취기내지초박막적윤습-거윤습성질적영향.재선도과정중,박막적형성수거윤습화결정경쟁적공제.차시소묘량열(DSC)측시결과표명,당상대분자질량상동시,결정성적순서시:DPCL최약,HPCL차약,LPCL최강.의거분자결구화상대분자질량적영향,즉거윤습화결정경쟁적결과,LPCL、HPCL화DPCL적초박막표현출불동적표면형태,포괄척촌불동적완정적구정、개구적구정、수지상편、분산적과립.
Star-branched poly(ε-caprolactone) (PCL) including hexa-aimed star-shaped PCL (HPCL), dendritic PCL (DPCL), and linear PCL (LPCL) were spin-coated onto mica substrates at room temperature. The effect of molecular structure on the wetting-dewetting behavior of ultrathin film (about 15 nm) was investigated with atomic force microscopy (AFM). During spin-coating, film formation is governed by competing dewetting and crystallization processes.According to differential scanning calorimetry (DSC), the crystallizability of DPCL is weaker than that of HPCL which is weaker than that of LPCL, when they have the same relative molecular mass. Depending on the molecular structure and the relative molecular mass of PCL, the competition between crystallization and dewetting results in ultrathin films of LPCL, HPCL, and DPCL with surface morphologies such as perfect spherulites, open spherulites, dendritic lamellae, and dispersed droplets of different sizes.