Sasimowski Emil, Majewski Łukasz, Grochowicz Marta
Department of Technology and Polymer Processing, Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Department of Polymer Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, 20-614 Lublin, Poland.
Materials (Basel). 2021 Jan 16;14(2):424. doi: 10.3390/ma14020424.
Unmodified poly (butylene succinate) (PBS) is characterized by very good processability; however, after the incorporation of various fillers of plant origin, its processing becomes much more complicated and its properties are significantly affected. Detailed studies of the processing aspects of PBS/wheat bran (WB) biocomposition are lacking, despite the addition of WB having a significant impact on both the production efficiency and the properties of end products. This research paper presents test results of the co-rotating twin-screw extrusion processing of a biodegradable polymer blend, the matrix of which was PBS, with WB as the filler. In undertaking this task, we examined the impact of extruder screw rotational speed and WB content on the characteristics of extrusion processing, as well as on certain thermal, physical, structural and processing properties of the obtained blend. The WB introduced to the blend was in the form of a selected fraction with particles smaller than 0.2 mm. The measurements were conducted using the Design of Experiment (DOE) methods, which enabled establishing the studied relationships in the form of polynomials and response surfaces. The determined extrusion process characteristics covered the impact of screw rotational speed and WB content on the mass flow rate of the processed blend and its pressure, the screw drive torque and specific energy consumption. The studies of the obtained polymer blend included determining the impact of the aforementioned variable factors on the melt flow rate (MFR) index, chemical structure (FTIR), thermal properties (differential scanning calorimetry (DSC), thermogravimetry (TG), derivative thermogravimetry (DTG)), relationships, microstructure, density and moisture absorbance. Analysis of variance (ANOVA) was used to assess the effect of individual variable factors. The results of this work are presented, inter alia, using Pareto charts of standardized effects, which illustrate the influence of individual terms of the determined regression equations on the studied quantity.
未改性聚丁二酸丁二醇酯（PBS）具有非常好的加工性能；然而，在加入各种植物源填料后，其加工变得更加复杂，性能也受到显著影响。尽管添加小麦麸皮（WB）对生产效率和最终产品性能都有重大影响，但目前缺乏对PBS/小麦麸皮生物复合材料加工方面的详细研究。本研究论文展示了以PBS为基体、WB为填料的可生物降解聚合物共混物的同向旋转双螺杆挤出加工测试结果。在进行这项任务时，我们研究了挤出机螺杆转速和WB含量对挤出加工特性的影响，以及对所得共混物某些热性能、物理性能、结构性能和加工性能的影响。引入共混物中的WB为选定的粒径小于0.2毫米的级分。测量采用实验设计（DOE）方法进行，这使得能够以多项式和响应面的形式建立所研究的关系。确定的挤出工艺特性包括螺杆转速和WB含量对加工共混物的质量流量及其压力、螺杆驱动扭矩和比能耗的影响。对所得聚合物共混物的研究包括确定上述可变因素对熔体流动速率（MFR）指数、化学结构（傅里叶变换红外光谱（FTIR））、热性能（差示扫描量热法（DSC）、热重分析法（TG）、导数热重分析法（DTG））、关系、微观结构、密度和吸湿率的影响。采用方差分析（ANOVA）来评估各个可变因素的影响。这项工作的结果尤其以标准化效应的帕累托图呈现，该图说明了所确定的回归方程的各个项对所研究量的影响。
