Influence of degree of crosslinking on rubber properties

Manufacturer:You explained the action of vulcanisation earlier but no mention was made about the physical properties of the rubber after vulcanisation. Can this be included?

JohnWoon: Please see the Table at the side bar on the right hand side. This is a good general guide... bearing in mind that some of the properties could be influenced by the level and types of fillers used.

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Can you wet a water repelling polyolefin like Polypropylene?

It is a well known fact that Polyolefins such as PP and PE have excellent hydrophobic characteristic making them difficult to wet since they tend to repel water. While this is advantageous in many applications, it makes them unsuitable for some fiber/nonwoven applications, where properties like aqueous absorption and wettability are required.

A hydrophylic effect can be achieved through the application of topical hydrophilic treatments by spraying or wiping with surfactants. While these treatments achieve an initial hydrophilic effect, they are not durable because the coating could be easily washed away. Application such as wipes must rely on the absorptive capacity of the fibers to hold water.

A hydrophilic internal additive for polyolefin fibers and nonwovens is available from Ciba. It is a melt-processable alternative to topical finishes and allows polypropylene fabrics to absorb many times their weight in water. In addition the additive also improves the soft feel and comfort of nonwoven fabrics.

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