Polymer chemistry
Polymer chemistry or macromolecular chemistry addresses the structure, characteristics and manufacture of polymers.
Table of contents
- What are polymers?
- What is Polymer Chemistry?
- Plastics analytics - the art of analysing polymers
- Natural and synthetic polymers
- Applications of Polymer Chemistry
- In Summary: Polymer Chemistry
What are polymers?
Polymers are chemical substances composed of macromolecules—that is, molecules with a high molecular weight and repeating structural units. They occur naturally, but are also produced synthetically on a large scale. When produced synthetically, these polymers are often referred to generally as plastics
What is Polymer Chemistry?
In polymer chemistry, chemists focus on the synthesis of polymers as well as the elucidation of their structure and properties. The modification of organic and inorganic polymers is an important branch of polymer chemistry and polymer science, aimed at adapting the properties of specific plastics to the technical requirements of industry.
Polymer analysis
at Quality Analysis
Polymers are indispensable constituents of numerous components and products from medical technology, through consumer articles, to the automotive industry. Here polymers must often withstand high loads. To make sure these requirements are met, our experts from the specialist area Chemical analytics acquire, quantify and evaluate your polymer materials and products using plastics analytics. We combine various analytical methods to analyse thermoplastics, thermosetting plastics, elastomers, composite materials and foams for their technical and chemical characteristics, e.g.
- RAMAN and FTIR spectroscopy
- SEM-EDX (scanning electron microscopy)
- Gas chromatography with coupled mass spectrometry (GC-MS)
- Thermogravimetry (TGA); coupling with FTIR and GC-MS possible
- Differential scanning calorimetry (DSC)
- Karl Fischer titration (KFT)
Natural and Synthetic Polymers
Natural Polymers
Natural polymers, also called biopolymers, are the building blocks of all organisms in nature. Here proteins and polysaccharides such as cellulose and starch are particularly worthy of mention, as well as the nucleic acids from which the DNA of all life is built. Natural polymers such as hair or fur, silk or cellulose fibres (cotton) are among the oldest materials known to man.
Semi-synthetic polymers
Semi-synthetic polymers are produced by chemically processing natural polymers; during this processing the natural monomers are modified such that the end product has the specific characteristics required. Today the most important commercially is vulcanised rubber. Celluloid was one of the first semi-synthetic polymers, however today it is only of historical significance.
Synthetic Polymers
Our modern world is practically inconceivable without synthetic polymers; there is practically no industrial sector where they are not used. They are synthesised using various chemical reactions, collectively termed polyreactions or polymerisation, from cracked naphtha, that is from a crude oil derivative.
The numerous different requirements have resulted in a broad range of plastics with different characteristics. DIN 7724 brings order to this area by classifying polymers into various groups according to their physical behaviour at room temperature and when subject to heat.
Thermosetting Plastics
As soon as they have cured after manufacture, thermosetting plastics, which are actually correctly called duromers, cannot be further deformed – not even by heating them up again because their macromolecules are closely cross-linked. Thermosetting plastics are of major importance in the automotive sector. For example, brake pads, bodywork and engine compartment parts are made using thermosetting plastics.
Elastomers
Unlike duromers, elastomers can be deformed. They deform under the action of tensile and compressive loads, but afterwards return to their original shape. Elastomers are used in many areas, for instance in the manufacture of tyres or rubber belts.
Thermoplastics
The macromolecules in thermoplastics consist of manomers with little branching, for this reason the bonds between the individual molecules are very weak. As a result they can be deformed by applying heat; this process can be repeated as often as necessary. These plastics can also be welded. Well-known and widely used plastics such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS) or polyvinyl chloride (PVC) are thermoplastics.
A sub-group of thermoplastics is high-performance plastics that meet higher requirements than ordinary technical plastics because they have, for example, greater thermal and chemical resistance. However, as a rule they place higher requirements on processing.
Thermoplastic Elastomers
Thermoplastic elastomers behave at room temperature like elastomers, however they can be subjected to plastic deformation by heating; they therefore combine the characteristics of elastomers and thermoplastics. These materials are used above all for seals and cable sheaths, however also for so-called soft-touch handles as are to be found on tools and consumer products such as toothbrushes or razors.
Electrically Conductive Polymers
Polymers are doped to make them electrically conductive, the term conductive polymers is used. Today these polymers are indispensable in many applications. Polymers produced in this manner are an important element of lithium-polymer batteries, as used for example in electric mobility. They are also essential in OLED displays, fuel and solar cells.
Applications of Polymer Chemistry
Polymer chemistry forms the foundation for numerous innovative applications across a wide range of industries. Through the targeted development and optimization of polymeric materials, it is possible to produce materials with precisely tailored properties—ranging from high mechanical strength and chemical resistance to exceptional flexibility or conductivity. As a result, polymers play a crucial role in the development of modern products and technologies. At Quality Analysis, we support companies with in-depth expertise and precise testing and analysis methods to reliably ensure the quality, safety, and performance of polymer-based materials.
Plastics Industry
In the plastics industry, polymer chemistry enables the development and production of plastics with customized properties. Plastics inspection is essential for ensuring the quality of polymeric materials. Targeted analytical methods ensure that plastics meet the required standards for mechanical strength, thermal stability, and chemical resistance. These tests are crucial for confirming the suitability of plastics for a wide range of applications—from packaging to technical components—and for ensuring consistent product quality.
Medical Technology
Polymers are used in a wide variety of medical devices and implants. For example, plastics are used in implants that integrate seamlessly into the tissue without causing inflammatory reactions. Polymers are also used in the manufacture of drug delivery systems, such as smart bandages or coated catheters, to precisely release medication and support healing.
Automotive
In the automotive industry, polymers are essential for making vehicles lighter, safer, and more efficient. Polymers are used in many vehicle components—from bumpers and interior trim to cable insulation. Thanks to polymer chemistry, plastics can be optimized to be particularly robust, heat-resistant, and resistant to mechanical stress.
Electronics Manufacturing
In electronics manufacturing, polymer chemistry is used to develop materials suitable for the production of components such as printed circuit boards, displays, cables, and enclosures. One key area is the production of flexible, lightweight, and conductive polymers used in modern electronic devices. These plastics contribute to the miniaturization and flexibility of electronic devices, such as in wearable devices, flexible displays, and sensors.
In Summary: Polymer Chemistry
Polymer chemistry deals with the study, production, and modification of polymers—large molecules composed of many repeating units (monomers). These macromolecules can occur naturally, such as cellulose or proteins, or be synthetically produced, such as plastics. Polymer chemistry encompasses both the synthesis of polymers and the analysis of their structure and properties.