This work was aimed at understanding the influence of fibrillar morphology on melt viscoelastic properties of polymer blends containing various blend ratios (polypropylene/polytrimethylene terephthalate: 99/1, 94/6, 90/10, 80/20). The blends were processed on co-rotating twin-screw extruder, and fiber spinning was employed as a post-processing method. Scanning electron microscopy was used to analyze the interior morphology of the as-extruded samples and fibers, and it was revealed that droplet and fibrillar morphologies are the formed morphologies in as-extruded and fiber samples, respectively. To appraise the melt viscoelastic responses of samples, rheological measurements were conducted in both linear and nonlinear regions. Formed physical fibrillar network caused the storage modulus and complex viscosity to appear as a secondary plateau along with intensified values in low-frequency region compared with the as-extruded blend samples. Moreover, the fibrillar structure increased the elasticity of the fibers whose effect was monitored by increased values of transient stress responses and creep-recovery experiments.

中文翻译：

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基于聚丙烯/聚对苯二甲酸丙二醇酯的原纤化混纺纤维的线性和非线性熔体粘弹性

这项工作旨在了解原纤形态对含有各种共混比（聚丙烯/聚对苯二甲酸丙二醇酯：99/1、94/6、90/10、80/20）的聚合物共混物的熔体粘弹性的影响。共混物在同向旋转双螺杆挤出机上加工，纤维纺丝用作后加工方法。扫描电子显微镜用于分析挤出样品和纤维的内部形态，发现液滴和纤维状形态分别是挤出样品和纤维样品的形成形态。为了评估样品的熔体粘弹性响应，在线性和非线性区域进行了流变测量。与挤出的共混物样品相比，形成的物理原纤维网络导致储能模量和复数粘度出现二次平台以及低频区域的增强值。此外，原纤维结构增加了纤维的弹性，其效果通过增加瞬态应力响应和蠕变恢复实验的值来监测。