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Erschienen in:
1999 | OriginalPaper | Buchkapitel
Crystallization of Homopolymers
verfasst von : Dr. Harro Träubel
Erschienen in: New Materials Permeable to Water Vapor
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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Homopolymers consisting of crystalline and possibly amorphous parts can be transferred to microporous products. A homopolymer, like polyethylene for instance, is treated with a swelling agent like perchloroethylene. Then the foil is stretched and the swelling agent removed [3, 20]. Homopolymers like polypropylene or polytetrafiuoroethylene (PTFE) (9.3 [11]) are in a crystalline state at room temperature. If films are stretched a kind of mini-crack occurs, which remain as micropores. Polymers with a partial crystalline structure such as polyolefins, polyacetates or polyamides become microporous by stretching [21].