Development of fibers with soft touch to human skin prepared from gelatin and the application of the fibers to clothing materials

从牛骨中提取的明胶可以给人的皮肤带来柔软的触感。然而，明胶膜的拉伸是非常困难的。为了制备对人体具有柔软触感的纤维，采用凝胶结晶法制备了明胶/聚乙烯醇（PVA）共混纤维。将Me_2SO和H_2O的组成设定为60/40。通过将充分共混的聚合物/溶剂混合物在80℃下加热10 min制备溶液。将热均化溶液骤冷至所需温度并在相同温度下干燥。当温度高于50℃时，观察到宏观相分离。样本无法伸长。另一方面，将溶液淬冷至低于亚稳温度的室温，发生微观相分离。蒸发溶剂后所得膜可伸长达5倍。X射线衍射从混合溶液中检测到的一个弯曲的PSPC系统表明，PVA的结晶迅速发生的冷却温度降低，但不能检测到任何信息的明胶。无论如何，证实了PVA-明胶共混物的拉伸比取决于淬火温度。这一机制将在后面讨论。

Gelatin prepared from bone of cow gives soft touch to human skin. However, drawing of gelatin film was very difficult. To prepare fibers with soft touch to human body, the blends of gelatin and poly (vinylalcohol)(PVA) were prepared by gelation/crystallization from solutions in dimethyl sulfoxide (Me_2SO) and water mixtures. The Me_2SO and H_2O composition was set to be 60/40. The solutions were prepared by heating the well-blended polymer/solvent mixture at 80℃ for 10 min. The hot homogenized solution was quenched to the desired temperature and dried at the same temperature. The macroscopic phase separation was observed at temperature higher than 50℃. The specimen could not be elongated. On the other hand, the solution was quenched to room temperature lower than spinodal temperature, the microscopic phase separation occurred. The resultant film after evaporating solvent could be elongated up to 5 times. X-ray diffraction from the mixed solutions detected by a curved PSPC system indicated that the crystallization of PVA occurs rapidly as the cooling temperature decreases but any information cannot be detected for gelatin. Anyway, it was confirmed that the draw ratio of PVA-gelatin blends depends on the quenching temperature. This mechanism shall be discussed later.