The Influence of Screw Configurations and Feed Mode on the Dispersion of Organoclay on PP
The Influence of Screw Configurations and Feed Mode on the Dispersion of Organoclay on PP
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螺杆配置和喂料方式对有机粘土在PP上分散的影响
DOI：
10.4322/polimeros.2013.079
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发表时间：
2013
影响因子：
1.3
通讯作者：
M. Oviedo
中科院分区：
文献类型：
--
作者：
Kelly S. Santos;R. Demori;R. S. Mauler;S. Liberman;M. Oviedo
螺杆构型的设计以及螺杆速度、停留时间、进料器类型和温度对粘土在基质中的分散有很大影响，因此对聚合物基质的机械和热性能有很大影响。本工作的目的是评估两种不同的螺杆配置（左手元件）和进料类型（料斗或侧进料器）对5重量%的Clobenzene 20 A分散到PP基体中而不使用相容剂的影响。在曲线1（较低剪切）中，5wt%C20A/PP（PPC 20 AP 1）纳米复合材料形态呈现出具有压实片晶的椭圆形附聚结构，而在曲线2中，5wt%C20A/PP（PPC 20 AP 2）显示出具有更好分离的片晶和更好的粘土分布到PP基质中的细长形式。当侧进料模式用于剖面2时，观察到椭圆形和细长结构与一些单独的粘土片的混合物。纯PP在两种螺杆配置中显示出相同的拉伸模量和冲击强度。PPC 20 AP 1呈现出低于PPC 20 AP 2的拉伸模量和冲击强度，因为在曲线2中，由于两个左手元件，压力和停留时间更高。因此，粘土在整个基质中的分散和分布得到改善，并且团聚结构减少。当使用侧进料器模式时，PP/粘土机械性能降低，但发现的值高于曲线1中的值。
The design of the screw configuration as well as the screw speed, the residence time, the feeder type, and the temperature has a large effect on the dispersion of the clay into the matrix and, consequently, on the mechanical and thermal properties of the polymeric matrix. The objective of the present work was to evaluate the influence of two different screw configurations (left-handed elements) and the feed type (hopper or side feeder) on the dispersion of 5 wt% Cloisite 20A into the PP matrix without the use of compatibilising agents. In profile 1 (lower shear), the 5 wt% C20A/PP (PPC20AP1) nanocomposite morphology presented elliptical agglomerated structures with compacted platelets, whereas in the profile 2, the 5 wt% C20A/PP (PPC20AP2) showed elongated forms with better separated platelets and a better clay distribution into the PP matrix. When the side feeder mode was used in profile 2, a mix of elliptical and elongated structures with some individual clay sheets was observed.The neat PP showed the same tensile modulus and impact strength in both screw configurations. The PPC20AP1 presented a tensile modulus and an impact strength that was lower than the PPC20AP2, because in profile 2 the pressure and residence time are higher due to the two left-handed elements. Thus, the dispersion and distribution of the clay throughout the matrix were improved, and the agglomerated structures were reduced. When the side feeder mode was used, there was a decrease in the PP/clay mechanical properties, but the values found were higher than those in profile 1.