DRDF analysis of wide-angle x-ray scattering of natural rubber
作者:
C.S. Wang,
G.S. Y. Yeh,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1978)
卷期:
Volume 15,
issue 1
页码: 107-118
ISSN:0022-2348
年代: 1978
DOI:10.1080/00222347808212248
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A differential radial distribution function (DRDF) of molten natural rubber (NR) was derived from its wide-angle x-ray scattering (WAXS) data. Three peaks with Bragg spacings 4.85, 2.31, and 1.23 Å corresponding, respectively, to interchain, C1-C3and C1-C2distances are present in the corrected WAXS curve. The derived DRDF, which is shown to be greatly improved than the ones published so far, contains six peaks located at 1.51, 2.48, 3.98, 5.68, 10.65, and 15.25 Å. Maximum contributions of intramolecular atomic distances to the radial distribution peaks were estimated and compared with the experimental results. The comparison shows that the first three peaks are intramolecular in origin and the remaining peaks are predominantly due to intermolecular regularities. A periodicity of an approximately constant interval of 5.26 Å is found between the intermolecular peaks and is attributable to the organizations of more or less parallel chain segments in the material. This finding provided additional evidence for the presence of local lateral ordering to the extent of about 30 Å in molten-state natural rubber.
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