Polymer

Polymers are characterised by a wide range of physical and chemical properties that make them ideal for different applications:

• Versatility: polymers can be flexible, rigid, transparent or opaque.

• Low density: lightweight materials, ideal for applications where weight matters.

• Durability: high resistance to chemical influences, weathering and mechanical wear.

• Processing: polymers can be shaped by processes such as extrusion, injection moulding or calendering.

• Insulating properties: excellent for electrical and thermal insulation.

Polymers can be divided into different categories, depending on their structure and behaviour under certain conditions:

Thermoplastics

• Description: soften when heated and can be shaped repeatedly.

• Examples: polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC).

• Applications: packaging, pipes, cable sheathing.

Thermosets

• Description: remain rigid after curing and cannot be reshaped.

• Examples: epoxy resin, phenolic resin.

• Applications: adhesives, insulators, housings.

Elastomers

• Description: highly elastic, return to their original shape after stretching.

• Examples: natural rubber, silicone.

• Applications: seals, tyres, hoses.

Polymers are produced by chemical reactions in which monomers are linked together:

Polymerisation processes

• Addition polymerisation: monomers with double bonds are linked into long chains (e.g. polyethylene).

• Condensation polymerisation: monomers react with the elimination of a by-product such as water (e.g. polyester).

Manufacturing processes

• Extrusion: polymer melt is pressed through a die to produce continuous profiles such as pipes or hoses.

• Injection moulding: polymers are injected into moulds to produce components with complex geometries.

• Blow moulding: production of hollow bodies such as bottles or tanks.

Polymers are indispensable in almost every industry:

Automotive industry

• Lightweight construction: polymers reduce vehicle weight and improve energy efficiency.

• Components: bumpers, interior trim, cable sheathing.

Construction industry

• Insulation: polymers are used for thermal and acoustic insulation.

• Pipes and seals: durable materials for plumbing and heating applications.

Medical technology

• Disposable items: syringes, gloves, catheters.

• Implants: biocompatible polymers for medical devices.

Packaging industry

• Flexibility: production of films, bags and bottles.

• Protection: barrier properties for food and sensitive products.

Polymers, especially plastics, are increasingly the focus of environmental debate:

Challenges

• Waste: plastics are often difficult to degrade and contribute to pollution.

• Microplastics: plastics break down into small particles that can enter the food chain.

Solutions

• Recycling: mechanical and chemical recycling to reuse plastics.

• Biopolymers: degradable alternatives made from renewable raw materials.

• What is the difference between thermoplastics and thermosets? Thermoplastics can be reshaped when heated, whereas thermosets remain rigid after curing.

• How are polymers recycled? Polymers can be recycled mechanically (shredding and reshaping) or chemically (conversion back into monomers).

• Are polymers environmentally friendly? Many synthetic polymers are not biodegradable, but biopolymers offer environmentally friendly alternatives.

• Which polymers are food-safe? Polyethylene (PE) and polypropylene (PP) are widely used for food packaging.

Modern industry is unthinkable without polymers. They offer an enormous range of properties that make them suitable for applications in almost every sector. Despite the challenges in terms of the environment and sustainability, polymers remain a central material whose potential is being further exploited through innovations such as recycling and biopolymers.