Thermoplastic

of thermoplastics are plastics, which can be deformed in a certain temperature range (thermal) simply (plastic). This procedure is reversible, i.e. it can be repeated by cooling and Wiedererwärmung into the fusionliquid condition arbitrarily often, so long not by overheatingthe so-called.thermal decomposition of the material uses. In it they differ from the thermosetting polymers and elastomers.

structure and organization

of thermoplastics are from few or did not branch out thus linear carbon chains developed, which are connected only by weak physical connections.

It becomesin amorphous (softening) and part-crystalline (melting) thermoplastics differentiated. The so-called Chandrall polymers form a special form of the amorphous thermoplastics.

If different thermoplastics are mixed with one another, then one calls the product a Polyblend.

Thermoplastics can be welded during effect of warmth and pressure, this are alsoor without welding-rod materials possible. The materials which can be welded are warmed up thereby beyond their fusing temperature and brought into a fluid condition. Since this happens for different plastics at different temperatures, can be welded beside kind-same only plastics with similar melt-flow indices, e.g. with one another. PMMA with PVC.

processing

of thermoplastics particularly in the spraying casting process it was originally processed why one called it also spraying masses (contrary to thermosetting polymers, which one called molding compounds). Today the extruding is a further important processing method.

examples

for the thermoplastics count z. B. Polyethylene and PP, first were Celluloid.