Correlation mechanism between the condensed structure and application characteristics of high modulus low shrinkage polyester industrial fiber
The impact of the condensed structure of high modulus low shrinkage(HMLS)polyester industrial fibers on their application characteristics under specific stress and heat conditions is not clear.The creep,stress relaxation and thermal shrinkage properties of three HMLS polyester industrial fibers were tested,and the condensed structure was studied by wide angle X-ray diffraction.The correlation between the application characteristics of HMLS polyester industrial fibers and parameters such as crystallinity,orientation of crystalline and amorphous regions,and grain size was analyzed.The results show that the joint effect of crystallinity and orientation of amorphous region has important influence on creep,stress relaxation and thermal shrinkage of HMLS polyester industrial fiber.The high crystallinity of HMLS2 inhibited the slip of the molecular chain during stress and thermal shrinkage processes,and the moderate orientation of amorphous region also reduced the disorientation of the molecular chain.The creep recovery rate of HMLS2 was 83.98%under 60%average breaking load,the stress relaxation rate was 14.65%treated for 60 s,and the strength loss was only 8%after heat treatment at 195℃,exhibiting good creep resistance and thermal stability.
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