ISSN:
1435-1528
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Summary The orientation crystallization behavior of natural rubber vulcanizates was investigated by means of a dynamic X-ray diffraction technique utilizing the semi-circular sector technique, and the frequency dependence of dynamic X-ray diffraction intensities from diatropic and paratropic crystal planes, (002) and (200) crystal planes, was observed over a frequency range from 10−3 to 101 cps as function of temperature, degree of crosslink, static extension ratio, and dynamic strain amplitude. The frequency dependence of the dynamic X-ray diffraction gives two dispersion regimes around 10−2 and 101 cps, and the dynamic orientation crystallization occurs in advance of the dynamic strain of the specimen. The frequency dispersion at low frequency side around 10−2 cps is much obvious for the (200) crystal plane and shifted in some extent to higher frequencies by several factors increasing the mobility of self-diffusion of rubber molecules, such as increase of temperature and decreases of extension ratio and degree of crosslink, while the frequency dispersion at high frequency side around 101 cps is rather obvious for the (002) crystal plane and not shifted by the factors, appreciably, suggesting that these frequencies must be considered as critical ones beyond which the crystallizations in the forms of the so-calledα- andγ-filaments can not appreciably proceed, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01520885
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