By D. Tripathi
Polypropylene is now the 3rd greatest fed on plastic fabric after polyethylene and polyvinyl chloride. This booklet discusses the benefits and downsides of operating with polypropylene, supplying useful touch upon the on hand kinds of polypropylene, its mechanical homes and in-service functionality, and processing. This publication is filled with important information regarding polypropylene. Comparisons with different universal plastics also are supplied, which spotlight the benefits of this polyolefin.
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Example text
Mould shrinkage and thermal expansion values for PP are compared with other thermoplastics in Table 2. 6). 3. 3 Mechanical Properties The mechanical properties of PP depend on several factors and are strongly influenced by the molecular weight. General observations suggest that an increase in molecular weight, keeping all other structural parameters similar, leads to a reduction in tensile strength, stiffness, hardness, brittle point but an increase in impact strength. This effect of molecular weight on the properties of PP is contrary to most other well-known plastics.
1 Assessment Under Food and Water Legislation PP is generally accepted as a non-toxic and non-carcinogenic material. PP homopolymers and copolymers are used in many food contact applications ranging from simple beverage closures to retortable pouch applications. 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.
The properties of some PP grades with different melt flow indices and structure are compared in Table 12. It can be observed that an increase in mechanical properties is not necessarily reflected in a trend predicted only on the basis of molecular weight, and other structural parameters, particularly crystallinity, play a very important role. Hence, the prediction of the mechanical properties on the basis of molecular weight or melt flow rate should be treated with caution. Appropriate data for the properties of the material should always be consulted.