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Gel formation in crosslinking of isotactic polypropylene initiated by dicumyl peroxide (DCP) is increased by addition of sulphur at 170°C; the dependence of gel formation on sulphur concentration (c DCP = const.) has a maximum at DCP/S equal to one. The highest gel content at DCP/S = 1 is obtained in the presence of about 0.7% of sulphur. The addition of divinylbenzene influences slightly the gel content, while pentaerythritol tetrallylether decreases it considerably.
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Čapla et al. (1985) studied this question.
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