Surface activation of high impact polystyrene and polypropylene by nitrogen and atmospheric air dc plasmas / Ativação superficial de poliestireno de alto impacto e polipropileno por plasmas dc de ar atmosférico e nitrogênio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Among the treatment options for polymers surface modifications, the plasma technology has showed a wide potential due to its efficiency and low waste generation. Conventional chemical treatments by means of sulfochromic solutions and other solvents present risks to factory workers and additional costs with residues disposal.In this study, polypropylene and high impact polystyrene were treated with nitrogen and atmospheric air cold plasmas in different voltages and treatment times. The remaining parameters (process current and gas pressure) were kept constant. Surface tensions up to 89% higher than the untreated state were observed for polypropylene and up to 57 % for high impact polystyrene. The presence of nitrogen and oxygen based polar groups was detected by means of photoelectrons spectroscopy (XPS). In addition, physical changes on polymers surfaces were observed by scanning electrons spectroscopy (SEM).The adhesion tests carried out by means of pull-off technique on painted polypropylene treated with atmospheric air during 10 minutes showed an increase of 516% in pull-off pressures after activation treatments.

ASSUNTO(S)

plasma dc tensão superficial polypropylene dc plasmas surface tension polipropileno high impact polystyrene poliestireno de alto impacto polimeros

ACESSO AO ARTIGO

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