Monomers, macromolecules and polymers
IUPAC defines a polymer as a substance composed of macromolecules. A macromolecule has a high relative molecular mass and can contain repetitions derived from smaller units. Monomers are starting molecules that participate in forming this structure during polymerisation.
Polymer does not mean only plastic. Cellulose and proteins are examples of natural polymers; polypropylene and polyethylene are synthetic polymers used in industry. Natural origin alone does not demonstrate biodegradability or a lower environmental impact.
Main classes: thermoplastics, thermosets and elastomers
Thermoplastics soften and can be shaped within an appropriate temperature range. PP belongs to this group. Reprocessing depends on conditions permitted by degradation, contamination and service history.
Thermosets develop a network during curing and cannot be remelted and reshaped like thermoplastics. Elastomers can substantially recover after large deformation under suitable conditions. These classes describe different structural and mechanical characteristics, not single formulations.
Where is polypropylene (PP) used?
PP is a thermoplastic used in processes including injection moulding, extrusion and fibre/film production. Homopolymer and different copolymer grades exist. Grade selection relates to impact behaviour, stiffness, flow and service conditions.
Products described as PP can have different technical properties. Flow values and test conditions in a supplier data sheet should be read alongside the intended part and process.
Choosing a polymer is not choosing a formulation
The main polymer is the matrix. Pigments, stabilisers, fillers and fibrous inputs may change processing and service behaviour. Properties of the raw polymer should therefore not be transferred unchanged to a finished part.
MTN POLİMER’s BIO-LIF work focuses on evaluating industrial fibrous by-products in PP formulations. General PP knowledge does not demonstrate the verified strength or suitability of a BIO-LIF-containing part; testing against a control formulation is required.