拉伸取向尼龙1010样品的抗张回复

Tensile Recovery of Oriented Nylon1010

研究了拉伸取向尼龙 10 10的抗张回复现象 .残存应变ε′表征了由链滑移而产生的永久形变 ,回复应变(ε -ε′)表征了键角变化和链段取向产生的形变 .当拉伸温度T=18℃ (T <Tg)时 ,残存应变ε′和回复应变 (ε-ε′)均随拉伸应变ε增大而线性增加 .T =5 0 ～ 140℃时 ,随ε增大 ,ε′开始逐渐增加而后趋于一常数 ;(ε-ε′)迅速增加 .ε′和 (ε-ε′)与拉伸速率v无关 .回复率R随ε增大呈线性增加 ,其方程为R(% ) =R0 +kε,其中R0随T的升高基本是线性下降 ,而k值随T升高而上升 .永久形变与热定形温度和拉伸倍数有关 .

The tensile recovery of oriented Nylon 1010 was discussed in this paper.The residual strain (ε′) characterizes the permanent set caused by chain slippage,and the recovery strain (ε-ε′) characterizes the deformation caused by changes of bond angle and the orientation of chain segment.Both ε′ and (ε-ε′) are increased linearly along with the extension of tensile strain (ε) when the tensile temperature (T) amounts to 18 ℃ (T<T g) .When T=50～140℃, ε′ is first increased and then tends to become a constant,and (ε-ε′) is increased rapidly with the extension of ε .Both ε′ and (ε-ε′) are independent with the tensile speed (v) .The recovery ratio (R) is increased linearly with the extension of ε ,and R(%)=R 0+kε .The permanent set is dependent on the temperaturd and tensile ratio.