Xie Qing, Chang Xiaohua, Qian Qian, Pan Pengju, Li Christopher Y
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
ACS Macro Lett. 2020 Jan 21;9(1):103-107. doi: 10.1021/acsmacrolett.9b00953. Epub 2020 Jan 6.
We report the formation and structure of poly(lactic acid) (PLA) nanofiber shish kebabs (NFSKs) containing stereocomplex crystal (SC) shish and SC/homocrystal (HC) kebabs. PLA-based NFSKs were obtained by combining electrospinning and controlled polymer crystallization in order to investigate the interplay between PLA SC and HC formation. Nanofibers were produced by electrospinning poly(l-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) blends and were used as the shish. A secondary polymer (either PDLA or PLLA/PDLA blends) was decorated on the nanofiber by an incubation method to form kebab lamellae. We show that both SC and HC kebab crystals can be formed using a SC shish following a soft epitaxy mechanism, while the subtle morphological differences in the resultant NFSKs reveal the propensity of SC nuclei in SC/HC crystallization.
我们报道了含有立体复合晶体（SC）晶须和SC/均相晶体（HC）串的聚乳酸（PLA）纳米纤维串（NFSKs）的形成与结构。基于PLA的NFSKs通过静电纺丝和可控聚合物结晶相结合的方法获得，以研究PLA的SC和HC形成之间的相互作用。通过静电纺丝聚（L-乳酸）/聚（D-乳酸）（PLLA/PDLA）共混物制备纳米纤维，并将其用作晶须。通过孵育法在纳米纤维上修饰第二聚合物（PDLA或PLLA/PDLA共混物）以形成串状片晶。我们表明，遵循软外延机制，使用SC晶须可以形成SC和HC串状晶体，而所得NFSKs中细微的形态差异揭示了SC/HC结晶中SC核的倾向。
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