This study presents a comprehensive experimental evaluation of the protective and ergonomic properties of three polymeric glove types: chloroprene-latex (C I), chloroprene (C II), and nitrile (N) upon exposure to methanol. Testing included chemical permeation breakthrough time determination, resistance to degradation by chemicals and bending stiffness measurements. Morphological changes were analyzed by scanning electron microscopy (SEM) of glove surfaces and cross-sections.
Results demonstrated that methanol breakthrough time strongly depends on polymer composition, with N gloves exhibiting the shortest breakthrough time and C II gloves providing the best balance between chemical resistance and mechanical integrity. Material C I exhibited negative degradation values, indicating increased hardness and puncture resistance after exposure, likely due to leaching of polymer material components. In contrast, C II and N materials showed mechanical weakening, with nitrile gloves undergoing the most significant degradation.
Bending stiffness increased for all materials after methanol contact, negatively impacting flexibility and ergonomics. SEM observations revealed increased surface porosity and micropores in C II gloves after prolonged exposure, as well as micro-cracks in cross-sectional layers, indicating permeation throughout the material. Thickness measurements correlated with these findings: C I showed decreased thickness consistent with leaching, while C II and N exhibited swelling.
The study highlights the necessity to limit glove use duration to the time before breakthrough of chemicals occurs, since chemical permeation is not halted by intermittent contact or cleaning and is not always detectable visually. These findings emphasize that both permeation and chemical degradation must be considered to ensure effective protection in chemically hazardous environments.
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