Mesoscopic Mechanical Properties of PEO Single Crystal

Xiu-juan Lv; Yu Song; Wen-ke Zhang

doi:10.11777/j.issn1000-3304.2017.17246

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Mesoscopic Mechanical Properties of PEO Single Crystal

Research Article | 更新时间：2021-01-26

- Mesoscopic Mechanical Properties of PEO Single Crystal
- Acta Polymerica Sinica Vol. 0, Issue 6, Pages: 748-754(2018)
- 作者机构：
  
  超分子结构与材料国家重点实验室吉林大学化学学院理论化学研究所　长春 130012
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17246
  CLC：
- Published：2018-6，
  
  Received：30 August 2017，
  
  Revised：1 December 2017，
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Xiu-juan Lv, Yu Song, Wen-ke Zhang. Mesoscopic Mechanical Properties of PEO Single Crystal. [J]. Acta Polymerica Sinica 0(6):748-754(2018)
DOI：

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

摘要

以固定于平整硅基底上的聚氧乙烯单晶为模型体系，利用原子力显微镜的成像功能定位单晶后，用探针压穿聚氧乙烯单晶层，测量单晶层的介观力学性质. 结果显示，原子力显微镜探针压穿单晶层所需要的力值为50 ~ 200 nN，随着探针曲率半径、下压速率和聚氧乙烯与溶剂界面能的增加，压穿单晶层所需要的力值也随之增加. 结合分子模型证明在压穿过程中聚氧乙烯分子被原子力显微镜探针挤压到单晶外部. 另外，发现在相同的下压速率和拉伸速率下，将相同数目的聚氧乙烯分子链挤压出晶体的能量与拉伸出晶体所需要的能量接近，继而从能量角度建立了聚氧乙烯晶体微观力学性质与介观力学性质的联系.

Abstract

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.

关键词

聚氧乙烯单晶原子力显微镜介观力学性质

Keywords

PEO single crystalAtomic force microscopyMesoscopic mechanical properties

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School of Mechanical Engineering, Jiangnan University

Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences

School of Materials Science & Engineering, Zhengzhou University

Key Lab of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University

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