Kalorische Untersuchungen an Wolle
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ASTBURY und WOODS fanden 1933 [1], da sich gedehnte Wollfasern nach kurz- zeitiger Behandlung 5 Minuten) mit Wasserdampf beim Entspannen unter ihre Ausgangslänge zusammenziehen. Sie bezeichneten diese Erscheinung als Superkontraktion. Dieser Begriff wurde dann erweitert auf alle durch Einwirkung verschiedener Agenzien bewirkte Kontraktion von Keratinfasern, ohne da eine vorherige Dehnung vorausgesetzt ist. Es handelt sich also beim Ausdruck Superkontraktion um einen phänomeno- logischen Oberbegriff, der verschiedenartige reversible oder irreversible mole- kulare Ordnung-Unordnungsumwandlungen chemischer und physikalischer Natur umfa t. Nach ZAHN [2] wird durch die Superkontraktion der Elastizitäts- modul um Zehnerpotenzen herabgesetzt und der lineare thermische Ausdeh- nungskoeffizient wird negativ, das hei t die Keratinfasern sind im superkontrak- tierten Zustand gummielastisch (entropieelastisch). Superkontraktion kann man 0 schon durch einfaches Erhitzen von Wolle in Wasser auf etwa 130 e (ZAHN [3]) erreichen, leichter durch Erwärmen in wä rigen Lösungen verschiedener Phenole [2], Formamid [4], Alkalisulfid, Alkalisulfit bzw. -bisulfit sowie mit konzentrier- ten Alkali- und Erdalkalisalz-Lösungen [5, 6]. In Lithiumbromid-Lösungen (> 6 m) beobachteten HALY und FEUGHELMAN [7] eine zweistufige Super- kontraktion, und zwar einmal kurz nach dem Einbringen der Faser in die LiBr- Lösungen bei Zimmertemperatur und dann die zweite Stufe bei Erhitzen auf ca. 90 C. Es liegt nahe zu vermuten, da die Verkürzung der Faser bei Raum- 0 temperatur auf anderen Vorgängen beruht als die bei 90 e beobachtete Kontrak- tion, doch soll an dieser Stelle nicht auf die verschiedenen Theorien der Super- kontraktion eingegangen werden, die einerseits ausschlie lich das Aufsprengen der Disulfidvernetzung (J. B.
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