Citation: Xiu-juan Lv, Yu Song, Wen-ke Zhang. Mesoscopic Mechanical Properties of PEO Single Crystal[J]. Acta Polymerica Sinica, ;2018, 0(6): 748-754. doi: 10.11777/j.issn1000-3304.2017.17246 shu

Mesoscopic Mechanical Properties of PEO Single Crystal

State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130012

Corresponding author: Yu Song, songyu16@jlu.edu.cn
Received Date: 30 August 2017
Revised Date: 1 December 2017
Available Online: 1 March 2018

Semicrystalline polymers are composed of crystalline and amorphous regions. The crystalline region plays a key role in determining their mechanical properties by providing stiff crosslinking domains. Understanding how the microscopic mechanical properties of the polymer single crystals are related to their macroscopic mechanical properties is significant to reveal the fundamental elastic and plastic deformations for advanced polymer engineering materials. The study of mesoscopic mechanical properties of polymer single crystal is key to this issue. Here, by using atomic force microscopy (AFM) imaging and force spectroscopy together, the mesoscopic mechanical properties of PEO single-crystal were investigated by squeezing PEO molecules out of the crystal phase using AFM tip. After elastically deformed, PEO single-crystal layer was penetrated by AFM tip at several tens of nN.The breakthrough force increased with the increase of the tip radius and PEO-solvent interfacial energy. The breakthrough force shows a linear correlation with the logarithm of the approaching velocity, which is fitted very well by molecular model. The energy for squeezing PEO chains out of their single crystal corresponds to the area enclosed by the approaching and retracting curves. Moreover, the energy for pulling a single PEO chain from its single crystal is calculated from the typical pulling curves. The energy for squeezing a same number of PEO chains out of their single crystal is about 23.4% lower than pulling. This energy comparison is helpful for bridging the microscopic and the mesoscopic mechanical properties. These results indicate that the combined techniques represent a novel experimental tool to investigate mesoscopic mechanical properties of the polymer materials in their condensed states.
- PEO single crystal,
- Atomic force microscopy,
- Mesoscopic mechanical properties
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