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- W2736665936 abstract "Reakcije i procesi radikalnih polimerizacija temeljni su i najvise upotrebljavani tehnoloski postupci dobivanja polimernih materijala. Radikalnim mehanizmom, međutim, nije moguce povecati brzinu polimerizacije, a da se istodobno ne smanji molekulna masa polimera. Nedavnim istraživanjima homopolimerizacije stirena u masi postignuto je bitno poboljsanje u proizvodnosti uporabom inicijatora s dvije peroksidne skupine razlicitih sklonosti toplinskom raspadu. Takvi inicijatori podliježu postupnom raspadu i na taj nacin stalno proizvode slobodne radikale tijekom procesa polimerizacije, dajuci, pri određenim reakcijskim uvjetima, potpunu konverziju monomera i polimer velike mase i uže raspodjele masa u usporedbi s monofunkcionalnim peroksidnim inicijatorima. Kao rezultat, vrijeme reakcije može se znatno skratiti bez potrebe mijenjanja reaktorskog sustava. U ovom radu dan je detaljan pregled i usporedba mehanizama i kinetickih modela polimerizacije slobodnim radikalima uz monofunkcionalni i difunkcionalni peroksidni inicijator. / Most of the synthetic polymeric materials are produced by the free radical initiated polymerization. However, due to the nature of its mechanism it is not possible to simultaneously obtain high polymerization rates and high molecular mass in bulk, suspension or solution processes. Recently, it was shown that in the bulk polymerization of styrene this problem can be overcome by using initiators with two peroxide groups of different thermal stabilities. Such initiators undergo a sequential decomposition, which generates primary radicals continuously as polymerization proceeds, giving simultaneously, at suitable reaction conditions, high monomer conversion, high molecular weight and narrower molecular weight distribution. Due to these advantages, the polymerization reaction time can be significantly reduced with no need for any modification of reactor equipment. In the present study, the reaction mechanisms and kinetic models of free radical polymerization using monofunctional and bifunctional initiators were presented and compared." @default.
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- W2736665936 date "2008-01-01" @default.
- W2736665936 modified "2023-09-23" @default.
- W2736665936 title "Kinetic model of free radical polymerization using bifunctional peroxide initiator" @default.
- W2736665936 hasPublicationYear "2008" @default.
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