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Dicumyl peroxide is an organic compound with the formula (C 6 H 5 CMe 2 O) 2 (Me = CH 3). Classified as a dialkyl peroxide, it is produced on a large scale industrially for use in polymer chemistry. It serves as an initiator and crosslinking agent in the production of low density polyethylene. [2]
The package containing the peroxide is placed in oven set for test temperature; The timer starts when product reaches 2 °C below intended test temperature; The oven is held at constant temperature for up to one week or, until a runaway event occurs. Test "Passes" if product does not exceed test (oven) temperature by 6 °C within one week
The lowest temperature at which a packaged organic peroxide will undergo a self-accelerating decomposition within a week is defined as the self-accelerating decomposition temperature (SADT). A large fire at the Arkema Chemical Plant in Crosby, Texas (USA) in 2017 was caused by the decomposition of various organic peroxides following power ...
At temperatures >100 °C, oxygen is passed through liquid cumene: [4] C 6 H 5 CH(CH 3) 2 + O 2 → C 6 H 5 C(CH 3) 2 OOH. Dicumyl peroxide is a side product. Applications
Peroxide crosslinking (PE-Xa): The crosslinking of polyethylene using peroxides (e.g. dicumyl peroxide or di-tert-butyl peroxide) is still of major importance. In the so-called Engel process , a mixture of HDPE and 2% [ 12 ] peroxide is at first mixed at low temperatures in an extruder and then crosslinked at high temperatures (between 200 °C ...
The term is usually used to describe the gradual degradation of organic compounds in air at ambient temperatures. Many common phenomena can be attributed to autoxidation, such as food going rancid , [ 2 ] the ' drying ' of varnishes and paints, and the perishing of rubber. [ 3 ]
The peroxide bond undergoes homolysis at temperatures above 100 °C. For this reason di-tert-butyl peroxide is commonly used as a radical initiator in organic synthesis and polymer chemistry. The decomposition reaction proceeds via the generation of methyl radicals. (CH 3) 3 COOC(CH 3) 3 → 2 (CH 3) 3 CO •
De Paoli and her collogues conducted a study testing thermal degradation on certain components found in fingerprints. For heat exposure, the amino acid and urea samples started degradation at 100 °C (373 K; 212 °F) and for lactic acid, the decomposition process started around 50 °C (323 K; 122 °F). [4]