聚乙烯单晶纳米力学性质的单分子力谱研究

doi:10.7503/cjcu20170434

高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (1): 166.doi: 10.7503/cjcu20170434

聚乙烯单晶纳米力学性质的单分子力谱研究

吕秀娟, 宋宇, 张文科()

吉林大学超分子结构与材料国家重点实验室, 化学学院, 长春 130012

收稿日期:2017-07-10 出版日期:2018-01-10 发布日期:2017-10-17
作者简介:联系人简介: 张文科, 男, 博士, 教授, 主要从事高分子相关纳米力学方面的研究. E-mail:zhangwk@jlu.edu.cn
基金资助:
国家自然科学基金(批准号: 21525418, 21474041)资助

Single Molecule Force Spectroscopy Study on the Apparent Nanomechanical Properties of Polyethylene Single Crystals^†

LÜ Xiujuan, SONG Yu, ZHANG Wenke^*()

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China

Received:2017-07-10 Online:2018-01-10 Published:2017-10-17
Contact: ZHANG Wenke E-mail:zhangwk@jlu.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21525418, 21474041)

摘要/Abstract

摘要：

基于原子力显微镜(AFM)的单分子力谱技术(SMFS), 在单分子水平上研究聚乙烯单晶中单分子链在外力诱导下的熔融过程. 研究表明, 随着聚乙烯单晶厚度的增加, 熔融解链过程需要破坏的作用位点随之增加, 解链力值显著提高; 刚性力加载装置会降低作用位点解离速率, 进而升高解链力值, 促进力学稳定性相对较差的中间态形成.

关键词: 聚乙烯单晶, 原子力显微镜, 单分子力谱, 纳米力学性质

Abstract:

Semi-crystalline polymers have been widely used as plastic, fiber and elastomers due to their excellent mechanical properties. As is well known, semi-crystalline polymer materials are composed of crystal and amorphous phases, and crystal phase plays very important roles in their mechanical properties. However, it is very difficult to discern the contribution of crystalline phase to the mechanical properties using traditional methods. Here, we study the mechanical properties of single polyethylene(PE) molecule within its single crystal using combined techniques of atomic force microscopy(AFM) imaging and AFM-based single-molecule force spectroscopy(SMFS). The results show that the apparent mechanical stability of single PE chain significantly increased with the increase of the thickness of PE single crystal. The stiffer loading device greatly enhanced the unfolding force of the single PE chain and promoted the formation of intermediates during unfolding process. These results deepen understanding on the origin of mechanical properties of PE single crystal, and may be useful for tuning the mechanical response of corresponding polymer materials.

Key words: Polyethylene single crystal, Atomic force microscopy, Single-molecule force spectroscopy, Nano-mechanical property

中图分类号:

O631.1⁺3

TrendMD:

吕秀娟, 宋宇, 张文科. 聚乙烯单晶纳米力学性质的单分子力谱研究. 高等学校化学学报, 2018, 39(1): 166.

LÜ Xiujuan, SONG Yu, ZHANG Wenke. Single Molecule Force Spectroscopy Study on the Apparent Nanomechanical Properties of Polyethylene Single Crystals^†. Chem. J. Chinese Universities, 2018, 39(1): 166.

图/表 5

Fig.1 AFM images of PE single crystals prepared at different crystallization temperatureTc/℃: (A) 65; (B) 70; (C) 75; (D) 80.

Fig.2 Schematic illustration of the force-induced unfolding of single PE chain from its single crystal(A), typical force-extension curves obtained on PE single crystals prepared at Tc of 65 ℃(red), 70 ℃(blue), 75 ℃(green), 80 ℃(purple)(B) and histograms of length increments between adjacent peaks(C) and peak forces(D)Thickness/nm: a. 8; b. 10; c. 11; d. 12.

Fig.3 Typical small sawtooth-containing force-extension curves obtained on PE single crystal(A) and closer inspection of the small sawtooth peaks on the big peak(B)ΔLp: length increment between adjacent small peaks. Inset: histogram of ΔLp.

Fig.4 Typical force-extension curves obtained by cantilevers(A), histograms of peak forces(B), closer inspection of the small sawtooth peaks on the big peak(C) and spring constant effect on the relative width of small sawtooth peaks(D)Cantilever/(pN·nm-1): a. 40; b. 150; c. 600. ΔL*: width of sawtooth peaks on the big peak.

Fig.5 Typical force-extension curve divided into five parts according extension(A), histogram of peak forces(B), ΔL*/ΔL(C) and Ke(D)(A) 0—50 nm(red, a), 50—100 nm(yellow, b), 100—150 nm(green, c), 150—200 nm(blue, d), 200—250 nm(purple, e).(B) a. (507±221) pN; b. (462±236) pN; c. (443±195) pN; d. (337±138) pN; e. (247±185) pN.(C) a. (32±27)%; b. (16±19)%; c. (3.8±6.6)%; d. (3.2±4.3)%; e. (3.0±3.5)%;(D) a. (103±74) pN/nm; b. (53±40) pN/nm; c. (44±32) pN/nm; d. (40±30) pN/nm; e. (25±24) pN/nm.

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聚乙烯单晶纳米力学性质的单分子力谱研究

Single Molecule Force Spectroscopy Study on the Apparent Nanomechanical Properties of Polyethylene Single Crystals^†

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聚乙烯单晶纳米力学性质的单分子力谱研究

Single Molecule Force Spectroscopy Study on the Apparent Nanomechanical Properties of Polyethylene Single Crystals†

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Single Molecule Force Spectroscopy Study on the Apparent Nanomechanical Properties of Polyethylene Single Crystals^†