Plasticization, external polycarbonate

Typical Use Waterproof seals. Building materials. Internal external. Typical Use Wood, GRP, plastics (including polycarbonate), metals. ... 

The antiplasticization phenomenon is presumably common to all the polymers exhibiting a relatively strong (5 transition, well separated from the a transition. It has been observed for both linear (PVC, polycarbonate, poly-sulphones) and network polymers (amine-crosslinked epoxies). For the case of thermosets, the phenomenon may be a consequence of both internal (change of the network structure) and external (incorporation of miscible additives) modifications of the structure or the composition but it always seems to be a consequence of the plasticization, as shown in Fig. 11.7. 

This technique, termed rotational molding (e.g. Engel Process), can be used with thermoplastic materials such as polyethylene, polypropylene, nylon, polycarbonate and polyurethane. The powdered plastic is placed in a mold and heated externally in an oven chamber to about 220-400°C, whilst it is rotated around both vertical and horizontal axes. As the powder melts, it adheres to the inner mold surface, building up an even layer over the surface of the mold. The mold, whilst still rotating, is withdrawn from the heated chamber and moved into a cooling chamber and the component removed after solidification [85]. 

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