Nanostructure and mechanical measurement of highly oriented lamellae of melt-drawn HDPE by scanning probe microscopy

	Nanostructure and mechanical measurement of highly oriented lamellae of melt-drawn HDPE by scanning probe microscopy
	Du BY ; Zhang J ; Zhang QL ; Yang DC ; He TB ; Tsui OKC
刊名	macromolecules
	2000
卷号	33 期号:20 页码:7521-7528
关键词	ATOMIC-FORCE MICROSCOPE MOLECULAR-WEIGHT THIN-FILM NANOINDENTATION POLYETHYLENE INDENTATION LOAD
ISSN号	0024-9297
通讯作者	he tb
中文摘要	scanning probe microscopy was used to simultaneously determine the molecular chain structure and intrinsic mechanical properties, including anisotropic elastic modulus and friction, for lamellae of highly oriented high-density polyethylene (hdpe) obtained by the melt-drawn method. the molecular-scale image of the highly oriented lamellae by friction force microscopy (ffm) clearly shows that the molecular chains are aligned parallel to the drawing direction, and the periodicities along and perpendicular to the drawing direction are 0.26 and 0.50 nm, respectively. the results indicate that the exposed planes of the lamellae resulting from the melt-drawn method are (200), which is consistent with results of transmission electron microscopy and electron diffraction. because of the high degree of anisotropy in the sample, coming from alignment of the molecular chains along the drawing direction, the measured friction force, f, determined by ffm is strongly dependent on the angle, theta, between the scanning direction and the chain axis. the force increases as theta is increased from 0 degrees (i.e., parallel to the chain axis) to 90 degrees (i.e., perpendicular to the chain axis). the structural anisotropy was also found to strongly influence the measurements of the transverse chain modulus of the polymer by the nanoindentation technique. the measured value of 13.8 gpa with transverse modulus was larger than the value 4.3 gpa determined by wide-angle x-ray diffraction, which we attributed to anisotropic deformation of the lamellae during nanoindentation measurements that was not accounted for by the elastic treatment we adopted from oliver and pharr. the present approach using scanning probe microscopy has the advantage that direct correlations between the nanostructure, nanotribology, and nanomechanical properties of oriented samples can be determined simultaneously and simply.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000089735800040
公开日期	2010-11-04
内容类型	期刊论文
源URL	[http://202.98.16.49/handle/322003/19529]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Du BY,Zhang J,Zhang QL,et al. Nanostructure and mechanical measurement of highly oriented lamellae of melt-drawn HDPE by scanning probe microscopy[J]. macromolecules,2000,33(20):7521-7528.
APA	Du BY,Zhang J,Zhang QL,Yang DC,He TB,&Tsui OKC.(2000).Nanostructure and mechanical measurement of highly oriented lamellae of melt-drawn HDPE by scanning probe microscopy.macromolecules,33(20),7521-7528.
MLA	Du BY,et al."Nanostructure and mechanical measurement of highly oriented lamellae of melt-drawn HDPE by scanning probe microscopy".macromolecules 33.20(2000):7521-7528.