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采用熔融共混法制备了微晶纤维素/聚丁二酸丁二醇酯(MCC/PBS)复合材料,用高级毛细管流变仪和旋转流变仪分别测定复合材料的稳态流变性能和动态流变性能,研究了不同MCC含量、不同温度对复合材料流变行为的影响。结果表明,复合材料的黏度与剪切速率的流变曲线符合幂律流体的特征,可以用幂律模型对其进行拟合;复合材料的黏度与温度的关系可用Arrhenius方程对其进行描述。在线性黏弹区,复合材料的储能模量(G′)维持恒定,当应变(γ)超过临界值(γ_c)时,复合材料进入非线性黏弹区,出现了“Payne”效应,并且随着MCC含量的增加,γ_c下降。在角频率(ω)扫描范围内,复合材料的储能模量(G′)、损耗模量(G″)和复数黏度|η*|均随着MCC含量的增加而增大。在相同的MCC含量下,G″的值始终大于G′的值,损耗因子(tanδ)均大于1。在低频区,G′出现第二平台。MCC/PBS复合材料加工流变特性的研究,对指导MCC/PBS复合材料的成型加工具有一定的价值。
The microcrystalline cellulose / polybutylene succinate (MCC / PBS) composites were prepared by melt blending method. The rheological properties of composites were determined by capillary rheometer and rheometer respectively. Dynamic rheological properties, the effects of different MCC content, different temperature on the rheological behavior of the composite material. The results show that the rheological curves of the viscosity and shear rate of the composite material accord with the characteristics of the power law fluid and can be fitted by power law model. The relationship between viscosity and temperature can be described by Arrhenius equation. In the linear viscoelastic region, the storage modulus (G ’) of the composite material remains constant. When the strain (γ) exceeds the critical value (γ_c), the composite material enters the nonlinear viscoelastic region and the “Payne” effect , And with the increase of MCC content, γ_c decreased. The storage modulus (G ’), loss modulus (G “) and complex viscosity | η * | of the composites increase with the increase of MCC content in the range of angular frequency (ω) With MCC content, the value of G ”is always greater than the value of G ’and the loss factor (tan δ) is greater than one. At low frequencies, G ’appears on the second platform. The research on rheological properties of MCC / PBS composites has certain value to guide the forming of MCC / PBS composites.