Electrospun isotactic polystyrene nanofibers as a novel β-nucleating agent for isotactic polypropylene

Chi Wang, You Ling Chu, Yi Jiun Wu

研究成果: Article同行評審

14 引文 斯高帕斯(Scopus)

摘要

Electrospinning of isotactic polystyrene (iPS) solutions at 73 °C or at room temperature was feasibly carried out using ortho-dichlorobenzene as the solvent. Depending upon the solution concentration, solution temperature, and collector design, bead-free iPS fibers with diameter of 230-430 nm were successfully obtained. As-spun nanofibers were found to be amorphous and contained oriented iPS chains. The structural evolution of the amorphous iPS nanofibers during stepwise annealing was investigated through two-dimensional small-angle X-ray scattering/wide-angle X-ray diffraction measurements using synchrotron radiation sources. Both the crystal structure (i.e., crystallinity degree and crystal orientation) and lamellar morphology (i.e., lamellar thickness and long period) in the fibers were studied to reveal the possible confinement effect on crystal development. When embedded in the isotactic polypropylene (iPP) matrix, crystalline iPS fibers act as effective nucleating agents that induce iPP transcrystallization on the surface of the fiber. A thin transcrystalline (TCL) layer of α-form iPP crystals is first developed. Subsequent formation of β-form nuclei sporadically takes place at the growing front of α-form TCL, and its growth eventually becomes dominant due to its higher growth rate than the α crystal in the temperature range studied. Having a high surface-to-volume ratio and the ability to induce β-form iPP, electrospun iPS nanofibers act as a promising filler, not only in increasing crystallization kinetics but also in potentially enhancing the toughness of as-prepared nanocomposites.

原文English
頁(從 - 到)5404-5412
頁數9
期刊polymer
53
發行號23
DOIs
出版狀態Published - 2012 十月 26

All Science Journal Classification (ASJC) codes

  • 有機化學
  • 聚合物和塑料
  • 材料化學

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