Effect of antioxidants and latex vulcanising agents on the environmental degradation of latex films.

Amir Hashim M. Y., . and Ma’zam M. S., . and Fauzi M. S., . and amaruzaman S., . and Ahmad Ikram A. J., . Effect of antioxidants and latex vulcanising agents on the environmental degradation of latex films. pp. 220-240. ISSN 1511-1768

The role of antioxidants and latex vulcanising agents on the environmental degradation of NR latex gloves and films was studied. In soil burial tests acetone-treated glove pieces degraded significantly more than the untreated samples after 24 weeks whereas polychloroprene and nitrile pieces remained unaffected. This solvent-induced rapid degradation rate of NR glove pieces was due to the leaching out of the organic antioxidants and dithiocarbamate accelerators. Under the scanning electron microscope the particulate-structured surface of the treated NR samples displayed wide cracks and cavities in the degraded areas which indicates bulk disintegration in the film. In agar plate culture studies more than 80 of bacteria could grow at the highest level (10 000 g/mL) of the phenolic antioxidants (Irganox Wingstay L). With the dithiocarbamate accelerators ZDEC was more inhibitory than ZDBC as 50 of the bacteria grew at the highest level of ZDBC (10 000 g/mL) but only 16 grew on ZDEC. The growth of fungi except yeast was unaffected by the presence of the antioxidants or accelerators. When latex films of varying curing systems were used increasing the level of crosslink concentrations increased their resistance to environmental degradation. As a group the non-sulphur prevulcanised films degraded much faster than the sulphur-vulcanised films. The singular presence of sulphur ZDEC ZnO or Irganox did not significantly affect the resistance of the non-sulphur prevulcanised films to environmental degradation whereas the combined effect of these additives did. The study confirmed that antioxidants and accelerators affect the rate of latex film degradation via their role in influencing the crosslink efficiency of the rubber.The role of antioxidants and latex vulcanising agents on the environmental degradation of NR latex gloves and films was studied. In soil burial tests acetone-treated glove pieces degraded significantly more than the untreated samples after 24 weeks whereas polychloroprene and nitrile pieces remained unaffected. This solvent-induced rapid degradation rate of NR glove pieces was due to the leaching out of the organic antioxidants and dithiocarbamate accelerators. Under the scanning electron microscope the particulate-structured surface of the treated NR samples displayed wide cracks and cavities in the degraded areas which indicates bulk disintegration in the film. In agar plate culture studies more than 80 of bacteria could grow at the highest level (10 000 g/mL) of the phenolic antioxidants (Irganox Wingstay L). With the dithiocarbamate accelerators ZDEC was more inhibitory than ZDBC as 50 of the bacteria grew at the highest level of ZDBC (10 000 g/mL) but only 16 grew on ZDEC. The growth of fungi except yeast was unaffected by the presence of the antioxidants or accelerators. When latex films of varying curing systems were used increasing the level of crosslink concentrations increased their resistance to environmental degradation. As a group the non-sulphur prevulcanised films degraded much faster than the sulphur-vulcanised films. The singular presence of sulphur ZDEC ZnO or Irganox did not significantly affect the resistance of the non-sulphur prevulcanised films to environmental degradation whereas the combined effect of these additives did. The study confirmed that antioxidants and accelerators affect the rate of latex film degradation via their role in influencing the crosslink efficiency of the rubber.

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Abstract

The role of antioxidants and latex vulcanising agents on the environmental degradation of NR latex gloves and films was studied. In soil burial tests acetone-treated glove pieces degraded significantly more than the untreated samples after 24 weeks whereas polychloroprene and nitrile pieces remained unaffected. This solvent-induced rapid degradation rate of NR glove pieces was due to the leaching out of the organic antioxidants and dithiocarbamate accelerators. Under the scanning electron microscope the particulate-structured surface of the treated NR samples displayed wide cracks and cavities in the degraded areas which indicates bulk disintegration in the film. In agar plate culture studies more than 80 of bacteria could grow at the highest level (10 000 g/mL) of the phenolic antioxidants (Irganox Wingstay L). With the dithiocarbamate accelerators ZDEC was more inhibitory than ZDBC as 50 of the bacteria grew at the highest level of ZDBC (10 000 g/mL) but only 16 grew on ZDEC. The growth of fungi except yeast was unaffected by the presence of the antioxidants or accelerators. When latex films of varying curing systems were used increasing the level of crosslink concentrations increased their resistance to environmental degradation. As a group the non-sulphur prevulcanised films degraded much faster than the sulphur-vulcanised films. The singular presence of sulphur ZDEC ZnO or Irganox did not significantly affect the resistance of the non-sulphur prevulcanised films to environmental degradation whereas the combined effect of these additives did. The study confirmed that antioxidants and accelerators affect the rate of latex film degradation via their role in influencing the crosslink efficiency of the rubber.The role of antioxidants and latex vulcanising agents on the environmental degradation of NR latex gloves and films was studied. In soil burial tests acetone-treated glove pieces degraded significantly more than the untreated samples after 24 weeks whereas polychloroprene and nitrile pieces remained unaffected. This solvent-induced rapid degradation rate of NR glove pieces was due to the leaching out of the organic antioxidants and dithiocarbamate accelerators. Under the scanning electron microscope the particulate-structured surface of the treated NR samples displayed wide cracks and cavities in the degraded areas which indicates bulk disintegration in the film. In agar plate culture studies more than 80 of bacteria could grow at the highest level (10 000 g/mL) of the phenolic antioxidants (Irganox Wingstay L). With the dithiocarbamate accelerators ZDEC was more inhibitory than ZDBC as 50 of the bacteria grew at the highest level of ZDBC (10 000 g/mL) but only 16 grew on ZDEC. The growth of fungi except yeast was unaffected by the presence of the antioxidants or accelerators. When latex films of varying curing systems were used increasing the level of crosslink concentrations increased their resistance to environmental degradation. As a group the non-sulphur prevulcanised films degraded much faster than the sulphur-vulcanised films. The singular presence of sulphur ZDEC ZnO or Irganox did not significantly affect the resistance of the non-sulphur prevulcanised films to environmental degradation whereas the combined effect of these additives did. The study confirmed that antioxidants and accelerators affect the rate of latex film degradation via their role in influencing the crosslink efficiency of the rubber.

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Item Type:	Article
AGROVOC Term:	Antioxidants
AGROVOC Term:	Latex
AGROVOC Term:	Vulcanization
AGROVOC Term:	Environmental degradation
AGROVOC Term:	Microbial degradation
AGROVOC Term:	Natural rubber
AGROVOC Term:	Films
AGROVOC Term:	Soil
AGROVOC Term:	Testing
AGROVOC Term:	Leaching
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:18
URI:	http://webagris.upm.edu.my/id/eprint/23120

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