Effect of Drawing Conditions on Polyester Filaments: Part I-Changes in Chemical, Structural and Physical Properties

5-9<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The influence of drawing ratio and drawing temperature on the characteristics of polyester filament yarns drawn under different drawing conditions has been studied. Chemical, structural and physical properties of drawn polyester filaments have been determined and correlated. Some parameters for assessing the dyeability of commercial polyester samples are suggested.</span

Some New Metal Complex Solvents for Use as Analytical Agents for Wool and Silk

34-36<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Cadoxen and zincoxen solvents have been found to dissolve wool and silk fibres. The dye content of the dyed material can be estimated by colorimetry of the solutions. With most dyeings, except yellow and orange, the cadoxen method is preferable. The extent of canary yellow coloration can he estimated using zincoxen. Wool solutions have extremely low specific viscosity and wool cannot be reprecipitated. Paper chromatography as well as TLC indicates the absence of amino acids. Light scattering measurements, however, show that wool molecules dissolved in zincoxen retain their polymeric nature.</span