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首页> 外文学位 >Analysis of distributive mixing during polymer blending in twin screw extruders using reactive polymer tracers.
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Analysis of distributive mixing during polymer blending in twin screw extruders using reactive polymer tracers.

机译：使用反应性聚合物示踪剂分析双螺杆挤出机中聚合物共混期间的分布混合。

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A novel quantitative method for analyzing distributive mixing during polymer blending in a co-rotating twin screw extruder was developed. This method employed a mixing limited interfacial reaction between two reactive polymer tracers to gain direct evidence of the generation of interfacial area during polymer blending. The tracers were based on a low molecular weight amorphous polyolefin wax containing a high concentration of terminal double bonds, which were targeted for functionalization with anhydride and primary amine functional groups. These functional groups were selected because their coupling reaction is extremely fast under the conditions employed during polymer processing in extruders. A melt-phase Alder Ene reaction between the terminal double bond of the polyolefin and the double bond of maleic anhydride was used to introduce a terminal succinic anhydride functional group. Hydroboration followed by amination was completed in solution with THF to introduce terminal primary amine functional groups. For the mixing experiments, the reactive polymers were blended into polypropylene (PP) resins at a concentration of 5wt%, which was adequate for quantitative analysis of the anhydride functional group conversion using a FT-IR spectrometer.; Distributive mixing, or the generation of interfacial area, was investigated during melt-melt blending of two segregated PP streams in a co-rotating twin screw extruder. Each PP stream contained one of the reactive polymers, which come into contact and react at the growing interface. A tandem single/twin screw extruder apparatus was used to perform the melt-melt blending experiments. One stream was metered to the beginning of the twin screw extruder, and the second was melt fed at a desired downstream position using the single screw extruder. As verified using model interfacial reactions, the coupling of anhydride and primary amine functional groups was mixing limited, and the anhydride conversion was linearly related to the interfacial area available for the reaction. A slit die at the end of the twin screw extruder was used to prepare a film for FT-IR analysis of the anhydride conversion, which was a direct measurement of the overall distributive mixing performance of the melt-melt blending section of the twin screw extruder. Experiments were completed to investigate the effects of operating conditions, screw configuration, and polymer viscosity on the overall distributive mixing. (Abstract shortened by UMI.)
机译：提出了一种新型的定量分析同向双螺杆挤出机共混过程中分布混合的方法。该方法采用了两个反应性聚合物示踪剂之间的混合受限界面反应，以获取聚合物共混过程中界面面积生成的直接证据。示踪剂基于含有高浓度末端双键的低分子量无定形聚烯烃蜡，目标是利用酸酐和伯胺官能团进行官能化。选择这些官能团是因为它们的偶联反应在挤出机中聚合物加工过程中所采用的条件下非常快。聚烯烃的末端双键与马来酸酐的双键之间的熔融相Alder Ene反应用于引入末端琥珀酸酐官能团。在硼氢化钠溶液中进行硼氢化，然后胺化，以引入末端伯胺官能团。对于混合实验，将反应性聚合物以5wt％的浓度混合到聚丙烯（PP）树脂中，这足以使用FT-IR光谱仪定量分析酸酐官能团的转化。在同向旋转双螺杆挤出机中将两种分离的PP料流熔融共混期间，研究了分布混合或界面面积的产生。每个PP料流都包含一种反应性聚合物，它们在增长的界面处发生接触并发生反应。使用串联的单/双螺杆挤出机设备进行熔融-熔融共混实验。将一种物料流计量加入双螺杆挤出机的开始，然后使用单螺杆挤出机将第二种物料熔融进料到所需的下游位置。如使用模型界面反应所验证的，酸酐和伯胺官能团的偶联受到混合限制，酸酐的转化率与可用于反应的界面面积呈线性关系。双螺杆挤出机末端的狭缝模头用于制备用于酸酐转化的FT-IR分析的薄膜，该薄膜是双螺杆挤出机熔体熔融共混部分的总体分布混合性能的直接测量值。完成了一些实验，以研究操作条件，螺杆配置和聚合物粘度对整体分配混合的影响。 （摘要由UMI缩短。）

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