Effect of heat retarding conditions on molecular chain orientation and mechanical properties of TLCP as-spun fibers
Thermotropic liquid crystalline polyarylester(TLCP)as-spun fibers were prepared by melt spinning under different heat retarding conditions.The molecular chain orientation and crystallinity of TLCP as-spun fibers were studied under different heat retarding conditions,as was the effect of heat retarding conditions on mechanical properties.The results showed that the change in heat retarding conditions had almost no effect on the crystallinity of TLCP as-spun fibers,but had a significant impact on their molecular chain orientation;the orientation factor(f)of TLCP as-spun fibers increased from 0.945 to 0.964 when the heat retarding temperature was controlled at 280 ℃ and the heat retarding height was reduced from 80 mm to 40 mm;f increased from 0.945 to 0.970 when the heat retarding height was set as 80 mm and the heat retarding temperature changed from 280 ℃ to no heat retarding;the breaking strength of TLCP as-spun fibers increased with the decrease of heat retarding temperature and de-creased with the increase of heat retarding height;the breaking strength of TLCP as-spun fibers increased from 5.9 cN/dtex to 8.7 cN/dtex when the heat retarding height was set as 80 mm and the heat retarding temperature changed from 280 ℃ to no heat retarding;and the fiber breaking strength decreased from 7.3 cN/dtex to 5.9 cN/dtex when the heat retarding temperature was set as 280 ℃ and the heat retarding height was increased from 40 mm to 80 mm.
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