AFM-tip-induced crystallization of poly(ethylene oxide) melt droplets |
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| Authors: | Dunshen Zhu Xingxian Shou Yixin Liu Erqiang Chen Stephen Zhengdi Cheng |
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| Institution: | (1) Department of Polymer and Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China;(2) Maurice Morton Institute and Department of Polymer Science, University of Akron, Akron, Ohio 44325-3909, USA |
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| 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 (M
n) 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 M
n ⩾ 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.
Translated from Acta Polymerica Sinica, 2006, (4): 553–556 (in Chinese) |
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| Keywords: | atomic force microscopy poly(ethylene oxide) tip-induced crystallization nanoindentation |
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