Polystyrene Modified by Grafting

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چکیده

Di ver sos ti pos de po li es ti re no mo di fi ca dos fo ram ob ti dos atra vés da po li me ri za ção por en xer tia (graft poly me ri za ti on) de es ti re no na pre sen ça dos se guin tes mo di fi ca do res: co po lí me ro de eti le no-acetato de vi ni la (EVA); po li e ti le no de ba i xa den si da de (PE) e po li bu ta di e no (PB). Os mo di fi ca do res fo ram uti li za dos em se pa ra do e com bi na dos. Em to dos os ca sos, man te ve-se a con cen tra ção de mo di fi ca dor fixa em 8% em peso e fo ram ava li a das as pro pri e da des dos pro du tos ob ti dos em fun ção da sua com po si ção. A téc ni ca de po li me ri za ção em pre ga da foi a de mas sa/sus pen são. Os me lho res re sul ta dos fo ram ob ti dos para os sis te mas PS/mo di fi ca do res mis tos. Os re sul ta dos ob ti dos para es tes sis te mas com pro vam que a co po li me ri za ção por en xer tia gera pro du tos com me lho res pro pri e da des de im pac to do que as ob ti das, a par tir de mis tu ras me câ ni cas dos com po nen tes in di vi du a is, em sis te mas se me lhan tes.

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تاریخ انتشار 2001