Creep and Recovery Behaviour of Oriented Nylon 6 Filaments

Abstract

<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 creep and creep recovery of commercial and heat-set nylon 6 monofilaments have been investigated. The creep was found to be non-linear viscoelastic even at strains below 1%. The creep data are shown to fit Nutting type of creep equation, viz. a plot of log creep strain versus log time results in a straight line. These studies show that an increase in the crystalline content of the anisotropic filament can lead to an increase in creep and creep rate. The mechanical data are analyzed in structural terms and it is suggested that the state of orientation of the non-crystalline regions can play an important part in determining the creep, creep rate and recovery from creep. The creep modulus is time-dependent; at low<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:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"=""> <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"="">speeds of measurement, as in creep, it appears to be related to the orientation of the noncrystalline regions of the fibre.</span></span></span>