Frontiers of Chemistry in China

, Volume 2, Issue 2, pp 174–177 | Cite as

AFM-tip-induced crystallization of poly(ethylene oxide) melt droplets

  • Zhu Dunshen 
  • Shou Xingxian 
  • Liu Yixin 
  • Chen Erqiang 
  • Stephen Zhengdi Cheng
Research Article

Abstract

The AFM-tip-induced crystallization of poly(ethylene oxide) (PEO) melt droplets was studied. The melt droplets with a height of 50–100 nm and a lateral size of 2–3 μm were obtained by melting the PEO ultra-thin films on a mica surface. For the PEO samples with average molecular weights (Mn) ranging from 1.0 × 103 g/mol to 1.0 × 104 g/mol, the lateral perturbation from the AFM tip in the hard-tapping or nanoscratch modes could not induce the growth of the flat-on lamellae. In contrast, under AFM nanoindentation mode, the tip-induced crystallization occurred when a sufficiently high vertical tip force was applied to the melt droplets of PEO with Mn ⩾ 1.0 × 104 g/mol. Moreover, the experimental results indicated that the AFM-tip-induced crystallization of PEO in the nanoindentation process had molecular weight dependence.

Keywords

atomic force microscopy poly(ethylene oxide) tip-induced crystallization nanoindentation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Pearce R, Vancso G J. Imaging of melting and crystallization of poly(ethylene oxide) in real-time by hot-stage atomic force microscopy. Macromolecules, 1997, 30: 5843–5848CrossRefGoogle Scholar
  2. 2.
    Pearce R, Vancso G J. Observations of crystallization and melting in poly(ethylene oxide)/poly(methyl methacrylate) blends by hot-stage atomic-force microscopy. J Polym Sci: Polym Phys, 1998, 36: 2643–2651CrossRefGoogle Scholar
  3. 3.
    Vancso G J, Beekmans L G, Pearce R, Trifonova D, Varga J. From microns to nanometers: Morphology development in semicrystalline polymers by scanning force microscopy. J Macromol Sci Phys, 1999, B38: 491–503Google Scholar
  4. 4.
    Li L, Chan C M, Li J X, Ng K M, Yeung K L, Weng L T. A direct observation of the formation of nuclei and the development of lamellae in polymer spherulites. Macromolecules, 1999, 32: 8240–8242CrossRefGoogle Scholar
  5. 5.
    Lei Y G, Chan C M, Li J X, Ng K M, Wang Y, Jiang Y, Li L. The birth of an embryo and development of the founding lamella of spherulites as observed by atomic force microscopy. Macromolecules, 2002, 35: 6751–6753CrossRefGoogle Scholar
  6. 6.
    Godovsky Y K, Magonov S N. Atomic force microscopy visualization of morphology and nanostructure of an ultrathin layer of polyethylene during melting and crystallization. Langmuir, 2000, 16: 3549–3552CrossRefGoogle Scholar
  7. 7.
    Magonov S N, Reneker D H. Characterization of polymer surfaces with atomic force microscopy. Annu Rev Mater Sci, 1997, 27: 175–222CrossRefGoogle Scholar
  8. 8.
    Hare E F, Zisman W A. Autophobic liquids and the properties of their adsorbed films. J Phys Chem, 1955, 59: 335–340CrossRefGoogle Scholar
  9. 9.
    Reiter G, Sommer J U. Crystallization of adsorbed polymer monolayers. Phys Rev Lett, 1998, 80: 3771–3774CrossRefGoogle Scholar
  10. 10.
    Reiter G, Sommer J U. Polymer crystallization in quasi-two dimensions. I. Experimental results. J Chem Phys, 2000, 112: 4376–4383CrossRefGoogle Scholar
  11. 11.
    Schnherr H, Frank C W. Ultrathin films of poly(ethylene oxides) on oxidized silicon. 1. Spectroscopic characterization of film structure and crystallization kinetics. Macromolecules, 2003, 36: 1188–1198CrossRefGoogle Scholar
  12. 12.
    Zhai X M, Wang W, Zhang G L, He B L. Crystal pattern formation and transitions of PEO monolayers on solid substrates from nonequilibrium to near equilibrium. Macromolecules, 2006, 39: 324–329CrossRefGoogle Scholar
  13. 13.
    Cheng Stephen Z D, Chen J H. Nonintegral and integral folding crystal growth in low-molecular mass poly(ethylene oxide) fractions. III. Linear crystal growth rates and crystal morphology. J Polym Sci: Polym Phys, 1991, 29: 311–327CrossRefGoogle Scholar

Copyright information

© Higher Education Press and Springer-Verlag 2007

Authors and Affiliations

  • Zhu Dunshen 
    • 1
  • Shou Xingxian 
    • 1
  • Liu Yixin 
    • 1
  • Chen Erqiang 
    • 1
  • Stephen Zhengdi Cheng
    • 1
    • 2
  1. 1.Department of Polymer and Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular EngineeringPeking UniversityBeijingChina
  2. 2.Maurice Morton Institute and Department of Polymer ScienceUniversity of AkronAkronUSA

Personalised recommendations