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Termiczne sieciowanie samoprzylepnych klejów silikonowych nadtlenkami organicznymi

Antosik A. K., Ragańska P., Czech Z.

Polimery

2014

T. 59, nr 11-12

792--797

Badano wpływ zawartości (0,5—3,0 % mas.) związków sieciujących — nadtlenku benzoilu (BPO) oraz nadtlenku dichlorobenzoilu (DClBPO) — na proces sieciowania wybranych samoprzylepnych klejów silikonowych (Si-PSA). Wszystkie badane samoprzylepne kleje silikonowe charakteryzowały się doskonałą adhezją oraz dużą wartością kohezji. W większości przypadków zwiększenie udziału związków sieciujących wpływało na zwiększenie kohezji i na zmniejszenie adhezji kleju. Stwierdzono, że odpowiedni dobór nadtlenku organicznego pozwala na uzyskanie określonych wartości kohezji i adhezji silikonowych klejów samoprzylepnych.

The effect of the concentration of crosslinking agent [benzoyl peroxide (BPO) and dichlorobenzoyl peroxide (DClBPO), in the range of 0.5 — 3.0 wt. %] on the crosslinking process of the selected silicone pressure-sensitive adhesives (Si-PSA) was investigated. All of the tested silicone adhesives showed excellent peel adhesion and high cohesion. In most cases, an increase in the crosslinking agent concentration resulted in the improved cohesion and reduced peel adhesion of Si-PSA. The specific parameters of the investigated silicone pressure-sensitive adhesives such as cohesion and peel adhesion can be obtained by a suitable selection of organic peroxide additive.

Kozak G. D., Tsvigunov A. N., Akinin N. I.

Central European Journal of Energetic Materials

2011

Vol. 8, nr 4

249-260

Properties that cause explosion hazard of organic peroxides, hydroperoxides and nitrocompounds are examined in the article. Ability to thermal explosion initiation of benzoyl peroxide and of nitrocompounds is compared. Explosion properties of peroxides are analyzed. Measurements of burning temperature by means of micro thermocouples and the comparison of their values with the calculated ones of benzoyl peroxide and hydroperoxide of isopropyl benzene lead to the conclusion that burning of them propagates in condensed phase. It is noted that heat instability of benzoyl peroxide burning, contrary to many nitrocompounds, is absent. Burning of benzoyl peroxide is stable even in vacuum. It is noted that, although benzoyl peroxide is not applied as explosive, in some cases the explosion hazard of benzoyl peroxide heating can be bigger than that of PETN. This conclusion was made on the basis of an investigation carried out by means of DSC method. The explosion process of benzoyl peroxide and hydroperoxide of isopropyl benzene propagates in a regime reminiscent of a low velocity detonation and the explosive effects are suffcient for severe destructions during accidents. This conclusion unfortunately is confrmed by bitter experience in practice. The results of the investigation of condensed products of explosion at impact of mixtures aluminum with peroxides and with nitrocompounds by means of impact-testing machine that were carried out in this work by X-ray diffraction analysis are discussed. It was shown that if the temperature of explosion of a mixture is Tp ≥ 2200-2300 K, practically all aluminum or aluminum hydride in the mixture transformed into aluminum oxide.