The effect of iodine doping on space charge distribution in LDPE has been investigated using a probe technique. The results indicate that iodine dramatically reduces the amount of space charges formed and changes their distribution pattern when compared with plain LDPE. Whereas in plain LDPE the distribution is of the homocharge type, in iodine-doped LDPE the distribution is of the heterocharge type with negative charges predominating. X-ray diffraction patterns show that the iodine has no influence on the crystallinity of the polymer.
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Khalil et al. (1985) studied this question.
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