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Duroplast is a composite thermosetting resin plastic developed by engineer Wolfgang Barthel in 1953 [2] in the German Democratic Republic. [ 3 ] [ 4 ] Its production method places it in a similar family as Formica and Bakelite .
Left: individual linear polymer chains Right: Polymer chains which have been cross linked to give a rigid 3D thermoset polymer. In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening ("curing") a soft solid or viscous liquid prepolymer (). [1]
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These are made by the reaction of phenols, formaldehyde and primary amines which at elevated temperatures (400 °F (200 °C)) undergo ring–opening polymerisation forming polybenzoxazine thermoset networks; when hybridised with epoxy and phenolic resins the resulting ternary systems have glass transition temperatures in excess of 490 °F (250 °C).
Examples of those are soft grip surfaces, design elements, back-lit switches and surfaces, as well as sealings, gaskets, or damping elements. TPE is commonly used to make suspension bushings for automotive performance applications because of its greater resistance to deformation when compared to regular rubber bushings.
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As seen on several other contemporary estates, the Trabant P 50 estate has a side-hinged rear door. The Trabant body has a skeleton-like steel frame with body panels made of duroplast, a material made from cotton waste and phenol resins. Instead of a regular grille and a radiator, the Trabant P 50 has small cooling vents below its headlamps.