Morphology and micromechanical behavior of blends of ethene/1-hexene copolymers
作者:
R. Godehardt,
S. Rudolph,
W. Lebek,
S. Goerlitz,
R. Adhikari,
E. Allert,
J. Giesemann,
G.H. Michler,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1999)
卷期:
Volume 38,
issue 5-6
页码: 817-835
ISSN:0022-2348
年代: 1999
DOI:10.1080/00222349908248141
出版商: Taylor & Francis Group
关键词: Blend;Copolymers;In situ deformation;Morphology;Scanning force microscopy;Transmission electron microscopy.
数据来源: Taylor
摘要:
Using (Me5Cp)2ZrCl2and Et(Ind)2ZrCl2activated by methylaluminoxane (MAO), ethene/1-hexene copolymers of markedly different densities were produced under the same conditions. Binary blends were produced by melt blending of a high-density ethene/1-hexene copolymer with an elastomeric ethene/1-hexene copolymer. Transmission electron microscope (TEM) investigations of ultrathin sections of samples stained with ruthenium tetroxide revealed the morphology of the different blends. Depending on the blend composition, the degrees of segregation differed. An analysis of the TEM micrographs shows that increasing the segregation of the elastomeric blend component seems to be accompanied by an increase of the mean thickness of the crystalline lamellae of the matrix. Corresponding to the TEM results, typical morphological structures were also revealed by scanning force microscope (SFM) investigations using the tapping mode and a force modulation mode. Furthermore, these SFM techniques were applied to study in situ local deformations and changes in the morphological structures in a certain specimen position while the external stress was successively increased. Results of these experiments, as well as those from additional TEM in situ tensile tests of thin sections, show that the deformation that appears homogeneously down to the micron range is strongly inhomogeneous in the submicron range.
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