A family of synthetic elastic fibers, designated spandex fibers, has been developed, providing new degrees of sheerness and effective "power" in elastic fabrics. These fibers have segmented polyurethane structures. They are durable, they are white and accept dye readily, and they can be set by heat. The development of these fibers has led to new textile technology and to new uses for elastic fabrics.
A chromatographic method for determining the carboxyl groups in filter paper was developed. Experiments were carried out with several kinds of metal ions, making use of the strong bond of different metal ions to the carboxyl groups of the paper. Lead(II) ions gave the most satisfactory results. The influence of ester and lactone groups on the carboxyl group determinations was studied. The method is rapid and reliable.
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