Effect of heat setting method on thermal shrinkage properties of high-strength polyvinyl alcohol filaments
High-strength polyvinyl alcohol(PVA)filaments were prepared by boron crosslinking wet spinning process.Tension heat setting and shrinking heat setting treatments were used respectively.The effects of heat setting methods on the mechanical properties,melt crystallization properties and thermal shrinkage properties of high-strength PVA filaments were studied.The re-sults showed that the high-strength PVA filaments prepared by two different heat setting methods had excellent mechanical proper-ties,including a breaking strength higher than 13 cN/dtex,an initial modulus higher than 300 cN/dtex and an elongation at break lower than 7.0%;the high-strength PVA filaments prepared by two different heat setting methods had the same melt crys-tallization properties,the melting peak temperature of the first heating was 239.82℃and the melting peak temperature of the second heating decreased to 232.29℃while the crystallization start temperature was 205.04℃and the crystallization peak tem-perature was 199.72℃;the dry heat shrinkage and shrinkage stress of high-strength PVA filaments prepared by two heat setting methods increased with the increase of temperature,and the upper service temperature limit of high-strength PVA filament was 200℃;shrinking heat setting treatment,compared with tension heat setting,contributed significantly lower dry heat shrinkage and shrinkage stress to high-strength PVA filament and effectively improved the dimensional stability of fibers.
polyvinyl alcohol fiberhigh strength and high modulustension heat settingshrinking heat settingthermal shrinkage properties
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