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Abstract：
In this work, a multivariate approach was utilized for gaining some insights into the processing-structure-properties relationships in polyethylene-based blends. In particular, two high-density polyethylenes (HDPEs) with different molecular weights were melt-compounded using a twin-screw extruder, and the effects of the screw speed, processing temperature and composition on the microstructure of the blends were evaluated based on a Design of Experiment-multilinear regression (DoE-MLR) approach. The results of the thermal characterization, interpreted trough the MLR (multilinear regression) response surfaces, demonstrated that the composition of the blends and the screw rotation speed are the two most important parameters in determining the crystallinity of the materials. Furthermore, the rheological data were examined using a Principal Component Analysis (PCA) multivariate approach, highlighting also in this case the most prominent effect of the weight ratio of the two base polymers and the screw rotation speed.
摘要：
在这项工作中,使用多变量方法来获得对聚乙烯基共混物中加工-结构-性能关系的一些见解。特别是,使用双螺杆挤出机将两种具有不同分子量的高密度聚乙烯（HDPE）熔融混合，以及螺杆速度的影响，基于实验设计-多元线性回归（DoE-MLR）方法评估共混物微观结构的加工温度和组成。热表征的结果，通过MLR(多元线性回归)响应面解释，表明，共混物的组成和螺杆转速是决定材料结晶度的两个最重要的参数。此外，使用主成分分析(PCA)多变量方法检查流变数据，在这种情况下还强调了两种基础聚合物的重量比和螺杆转速的最显著的效果。
