Research on aggregate structure of polyester industrial filament based on conformational changes of ethylene glycol segments
Three different spinning processes,namely traditional process(A),raising spinneret draw ratio(B)and reducing the second draw ratio based on the elevation of spinneret draw ratio(C),were applied to prepare polyester industrial yarn samples(F-A,F-B,F-C)which were exposed to 30-120 days of heat treatment in a 150℃ oven.The effects of spinning process and heat treatment time on the ethylene glycol chain conformation of polyester industrial yarn were studied to investigate the changes in the aggregate structure of polyester industrial yarn.The results showed that increasing the spinneret draw ratio promoted the trans-formation of the side conformation of ethylene glycol chain segment in the fiber to the trans conformation,and reducing the second draw ratio was not enough to damage the original structure of the fiber;the relative content(Xt)of the trans conformation of eth-ylene glycol chain segment in the sample increased from 23.37%to 29.00%,and the crystallinity(Xc)decreased from 43.04%to 42.57%when the spinneret draw ratio increased from 109.62 to 120.00;the Xt of the sample increased from 29.00%to 41.73%and the Xc increased from 42.57%to 45.44%when the second draw ratio decreased from 3.389 to 3.200;for samples F-A and F-C,as the heat treatment time was prolonged,the Xt and Xc of the samples both first increased and then decreased,reaching their maximum values after 90 days of heat treatment;and for sample F-B,as the heat treatment time was prolonged,the Xt and Xc of the sample gradually increased,reaching 64.90%and 63.36%respectively after 120 days of heat treatment.
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