甲壳型液晶高分子PBPCS熔体纺丝的剪切本构行为

Research on Shear Constitutive Behavior of PBPCS in Melt Spinning

采用近似简化处理,将甲壳型液晶高分子PBPCS熔体复杂纺丝过程模拟为探讨熔体的稳态剪切行为,首先用随体坐标系建立其本构方程,得到Dewitt模型;然后进行了甲壳型液晶高分子PBPCS的剪切流变ARES实验,实验发现PBPCS熔体出现剪切变稀,粘度有"结构粘性"的特点。Dewitt理论模型和ARES实验均表明,甲壳型液晶高分子PBPCS熔体易破裂,为了避免熔体破裂,要在小于120 min-1的剪切速率下纺丝。

In this paper, the mesogen-jacketed liquid crystalline polymer PBPCS melt spinning process is simplified to explore the melt’ s shear behavior by the approximation approach. Firstly, the constitutive equation is established through the satellite coordinates, and then Dewitt model is derived. Moreover, the ARES shear rheology experiment show PBPCS melt is shear-thinning and its viscosity is structure-sticky. Dewitt theoretical model and ARES experiments both demonstrate that the shear rate should less than 120 min-1 to avoid melt frangible.