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首页> 外文期刊>Journal of Applied Polymer Science >MORPHOLOGY DEVELOPMENT OF LDPE-PS BLEND COMPATIBILIZATION
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MORPHOLOGY DEVELOPMENT OF LDPE-PS BLEND COMPATIBILIZATION

机译：LDPE-PS共混物的形态学发展

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LDPE-polystyrene (PS) blends were compatibilized using three PS-hydrogenated polybutadiene-PS and one PS-hydrogenated polybutadiene block copolymers. The blends were prepared by corotating twin-screw extrusion, then were injection-molded. During processing, the morphology evolution of the blends was studied using SEM and image-analyzing techniques. Different screw profiles were used for extrusion. Under the extrusion conditions and when all the blend constituents had melted, the use of one kneading-disc section resulted in a high mixing effect. The addition of other kneading-disc sections did not increase the dispersion. The flow of the blend, through the extruder die or in the injection mold, induced heterogeneous skin-core structures. The analysis of the evolution of the structure of these blends during processing showed that the addition of a compatibilizer increased their stability. Going from LDPE-rich to PS-rich blends, the morphology evolves from a nodular dispersion of PS in LDPE to a cocontinuous structure. With the addition of a copolymer to a 25-75 wt % LDPE-PS blend, the structure changes from a cocontinuous to a nodular one. Comparing the effect of the different copolymers on the blend morphology, the diblock copolymer results in the most homogeneous and finest dispersions. The stabilization of increasing potential values of the interface surface of these blends requires increasing concentrations of the copolymers. (C) 1996 John Wiley & Sons, Inc. [References: 31]
机译：使用三种PS氢化的聚丁二烯-PS和一种PS氢化的聚丁二烯嵌段共聚物使LDPE-聚苯乙烯（PS）混合物相容。共混双螺杆挤出制备，然后注塑。在加工过程中，使用SEM和图像分析技术研究了共混物的形态演变。不同的螺杆轮廓用于挤出。在挤出条件下，当所有的共混物成分都已熔化时，使用一个捏合盘部分会产生很高的混合效果。添加其他捏合盘部分不会增加分散度。共混物通过挤出机模头或在注塑模具中的流动引起异质的皮芯结构。对这些共混物在加工过程中结构演变的分析表明，添加相容剂可提高其稳定性。从富含LDPE的混合物到富含PS的混合物，其形态从PS在LDPE中的结节状分散演变为共连续结构。通过将共聚物添加到25-75wt％的LDPE-PS共混物中，结构从共连续的变为节状的。比较不同共聚物对共混物形态的影响，二嵌段共聚物可得到最均匀和最细的分散体。这些共混物的界面表面的增加的电势值的稳定化要求增加共聚物的浓度。 （C）1996 John Wiley＆Sons，Inc. [参考：31]

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