Modificação da superficie de borracha EPDM tratada por meio de processos a plasma frio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The surface of vulcanized ethylene-propylene diene monomer (EPDM) rubber is highiy hydrophobic and so it is not suited for a number of potential applications, in particular, for to the polyurethane liner of solid propellants used in missiles and rocket. In this case, plasma treatment is a very attractive process to improve their adhesive properties. The EPDM rubber is an important material for rocket engine technology due to its thermal and mechanical characteristics. The improvement of the adhesion characteristics of EPDM on other kinds of polymers, using plasma technology, has been the major subject of many research works. carried out during the last years. In this work, the EPDM surface activation process was carried out in a reactive ion etching reactor (RIE) operated at 13,56 MHz using pure oxygen and a gas mixture of argon and oxygen in different proportions (6:0, 5:1,4:2, 3:3, 2:4, 1:5,0:6), with a total flow of 60 sccm. These essays were performed varying the process pressure from 70 mTorr to 1000 mTorr, process time from 1min to 20min and RF power input from 50W to 300W. In the order to investigate the influence ofthe parameters on the modifications of rubber surface, the samples were analyzed by goniometer, AFM, ESCA and FT - IR. The results shown that plasma assisted processes efficiently created new polar functional groups (-OR, -C=O, COOR) which increase the energy and roughness of surface rubber, thus enhancing its adhesion characteristics. The treatment of vulcanized EPDM rubber with 02/ Ar plasma proves to be a promising and alterna tive process of surface treatment able to result in the increase in the adhesive bond strength of this material. This effect is produced as a result of multiple surface phenomena induced by the plasma

ASSUNTO(S)

quimica de superficie borracha plasma de baixa temperatura

ACESSO AO ARTIGO

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