Morphological interpretations and their correlation with biphasic rheological networks and subsequent segmental relaxation, and electrical conductivity were comprehensively addressed for polyamide‐12/polypropylene‐multi‐walled carbon nanotubes (PA‐12/PP/MWNT) based ternary nanocomposites fabricated by melt mixing route. The partial migration of MWNT from PP to PA‐12 phase is evident from the spreading coefficient estimations based on interfacial dynamics and transmission electron microscopy (TEM) analysis. Melt rheology measurements based on scaling parameters associated with various viscosity models such as, Cross model, Carreau‐Yasuda model, and Berzin model indicated systematic variation in network rigidity that is in tune with dispersion‐selective nano‐morphology of the nanocomposites. The phase inversion was attained for composition in the range of 50 to 60 wt% of PP‐MWNT content as indicated by Han plot and van‐Gurp Palmen plots which is in direct correspondence to dispersed‐phase‐volume‐fraction range of ~0.3‐0.36. Broadening of loss‐peaks vis‐a‐vis enhanced storage moduli in dynamic mechanical analysis (DMA) signifies the reduced mobility (of polyamide chains) and hence the enhanced stiffness. The electrical conductivity of the nanocomposites post‐annealing decreased at temperatures above 100°C demonstrating the temperature‐sensitive morphology disruption (of the conductive PP‐MWNT channels) in the nanocomposites.

中文翻译：

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相选择性的微观结构对熔融混合的聚酰胺12 /聚丙烯-多壁碳纳米管三元纳米复合材料的流变网络，节段弛豫和导电行为的影响

通过熔融混合法制备的基于聚酰胺12 /聚丙烯多壁碳纳米管（PA-12 / PP / MWNT）的三元纳米复合材料的形态学解释及其与双相流变网络，随后的段弛豫和电导率的相关性得到了全面解决。MWNT从PP到PA-12相的部分迁移可以从基于界面动力学和透射电子显微镜（TEM）分析的扩散系数估算中看出。基于与各种粘度模型（例如，Cross模型，Carreau-Yasuda模型和Berzin模型）相关的缩放参数的熔体流变学测量表明，网络刚度的系统变化与纳米复合材料的分散选择性纳米形态相吻合。根据Han曲线和van-Gurp Palmen曲线所示，PP-MWNT含量在50％至60 wt％范围内的组成可以实现相变，这直接对应于〜0.3％的分散相体积分数范围0.36。相对于动态力学分析（DMA）中增强的储能模量，峰值损失范围的扩大表明（聚酰胺链的）迁移率降低，因此刚度增强。在高于100°C的温度下，纳米复合材料的退火后电导率下降，这表明纳米复合材料中（导电PP-MWNT通道的）温度敏感性形态破坏。相对于动态力学分析（DMA）中增强的储能模量，峰值损失范围的扩大表示（聚酰胺链的）迁移率降低，因此刚度增强。在高于100°C的温度下，纳米复合材料的退火后电导率下降，这表明纳米复合材料中（导电PP-MWNT通道的）温度敏感性形态破坏。相对于动态力学分析（DMA）中增强的储能模量，峰值损失范围的扩大表示（聚酰胺链的）迁移率降低，因此刚度增强。在高于100°C的温度下，纳米复合材料的退火后电导率下降，这表明纳米复合材料中（导电PP-MWNT通道的）温度敏感性形态破坏。