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The supramolecular structure in pipe walls of isotactic PP‐R is a function of compound composition and processing parameters, which both influence the mechanical properties of the pipes. µFTIR shows a gradient of the crystallinity across the pipe wall, with a lower‐crystalline outer layer, and a higher‐crystalline core layer. The rate of extrusion has an influence on the thickness of the outer layer. The nucleating effect on the morphological profile throughout the pipe wall can be visualised. µFTIR shows a homogeneous distribution of the primary antioxidant in the pipe wall. Both the spectral crystallinity and the antioxidant concentration distribution are calculated.magnified image

Polyurethane sponge was used for scleral buckling in 165 patients suffering from retinal detachment. This material showed good tissue compatibility and the therapeutic procedure was successful in 90% of the cases thus treated. In 10 patients polyurethane was used with success for cerclage. Postoperative complications observed were infection of the sponge in one patient and conjunctival dehiscence in two. Polyurethane sponge is less elastic than silicone sponge but has the same scleral buckling effect.

Soft polyurethane foam was sutured to the sclerae of 28 rabbit eyes in a manner similar to scleral buckling in retinal detachment surgery. During the follow-up period no tissue incompatibility was observed and wound healing appeared to be without complications. Microscopic examination revealed fibrocytes growing through the sponge and after 24 weeks the polyurethane meshwork was completely filled with granulation tissue.

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