By D. Tripathi
Polypropylene is now the 3rd greatest fed on plastic fabric after polyethylene and polyvinyl chloride. This ebook discusses the benefits and downsides of operating with polypropylene, delivering useful touch upon the on hand kinds of polypropylene, its mechanical homes and in-service functionality, and processing. This ebook is choked with invaluable information regarding polypropylene. Comparisons with different universal plastics also are supplied, which spotlight the benefits of this polyolefin.
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Additional resources for Practical Guide to Polypropylene
The main requirements for contact with food are that the article must not impart odour or taste to the food and should be suitable for the intended application. The main reason for assessment of PP for contact with food or potable water comes from the use of additives in material formulation. , can migrate to any food in contact if the concentration of these substances is lower in the food than in the plastic. The migration of these species is a function of time and temperature. The rate of migration of chemicals or additives is inversely proportional to the molecular weight of the PP.
4 Metal Deactivators and Acid Scavengers As with most polyolefins and polydiene, the presence of metals has a strong adverse effect on PP and most antioxidants are relatively ineffective. Copper and cuprous alloys produce the greatest effects, but other metals such as iron and nickel also accelerate degradation. Metal deactivators are widely used to deactivate metal residues present in the formulation due to catalyst residues, impurities in additives, direct contact with copper in wire and cable applications and metal inserts.
Copolymer grades of PP have substantially lower creep modulus than the homopolymer grades. PP has a similar modulus to high density PE, but its resistance to creep is much better and, at a equivalent time under similar load, the creep modulus of PP is more than that of high density PE. However, the creep resistance of amorphous plastics is much better than the semi-crystalline plastics such as PP and PE. Creep resistance of PP could be further improved by addition of fillers or reinforcements. The creep behaviour of moulded artefacts is affected by the residual stress or orientation effect in the moulded article.