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在线性粘弹性范围内,通过动态线性小振幅剪切震荡实验得MC尼龙6/Kevlar纤维复合材料熔体的储能模量G′和损耗模量G″。在广义Maxwell模型的基础上,分别用最小二乘法线性回归和非线性回归法,计算出离散松弛时间谱,借此可了解材料的凝聚态及粘弹性等。两种方法的比较结果:线性回归法的松弛模态数的取值范围一般为5～9,非线性回归法的松弛时间谱与松弛模态数关系不大;随着松弛时间范围的变宽,非线性回归法松弛谱的基本形状变化不大,而线性回归法的松弛强度出现过多的负值,无法表征物料的松弛谱。本文还讨论了不同纤维含量对MC尼龙6/Kevlar纤维复合材料熔体松弛时间谱的影响。
In the range of linear viscoelasticity, the storage modulus G ’and the loss modulus G "of MC nylon 6 / Kevlar fiber composite melt were obtained by dynamic linear small-amplitude shear-vibration experiment. On the basis of generalized Maxwell model, The least squares regression and non-linear regression were used to calculate the discrete relaxation time spectrum, which can be used to understand the condensed state and viscoelasticity of the material.Comparison results of two methods: the value of relaxation mode of linear regression The range is generally 5 to 9, non-linear regression relaxation time spectrum and mode of relaxation has little to do with the relaxation time range broadened, the basic shape of the nonlinear regression relaxation spectrum little change, and linear regression The slack strength of the MC nylon 6 / Kevlar composites is excessively negative, which can not characterize the relaxation spectrum of the materials.The effects of different fiber contents on the melt relaxation time spectrum of the MC nylon 6 / Kevlar fiber composites are also discussed.