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Effect of shear forces on dispersion-related properties of microcrystalline cellulose-reinforced EVOH composites for advanced applications
Composites Part A: Applied Science and Manufacturing ( IF 8.7 ) Pub Date : 2020-09-18 , DOI: 10.1016/j.compositesa.2020.106103
Georg Graninger , Sandeep Kumar , Graham Garrett , Brian G. Falzon

Recently, inexpensive and readily available bio-renewable microcrystalline cellulose (MCC) has been explored as a filler to mechanically reinforce thermoplastic matrices. Most research focuses on surface modification of MCC to improve dispersion in the polymer matrix. Herein, two screw configurations (low shear (LS) and high shear (HS)) were designed for twin-screw extrusion to investigate the effect of shear, during processing, on the dispersion of MCC particles in an ethylene–vinyl alcohol (EVOH) matrix. The results demonstrate the significance of the high shear screw configuration on the size of MCC particles, and their in-situ fibrillation and distribution within the EVOH matrix. HS mixing of EVOH/MCC resulted in a significant increase in flexural strength and storage modulus compared to EVOH/MCC (LS) composites, similar to property improvement in EVOH/cellulose nanocrystal (CNC) composites at the same loading, thus providing an alternative to energy-intensive CNC in continuous melt processing without an appreciable rise in production costs.



中文翻译:

剪切力对高级应用微晶纤维素增强EVOH复合材料分散相关性能的影响

近来,已经探索了廉价且容易获得的生物可再生微晶纤维素(MCC)作为机械增强热塑性基质的填料。大多数研究集中在MCC的表面改性上,以改善在聚合物基质中的分散性。在此,设计了两种螺杆配置(低剪切(LS)和高剪切(HS))用于双螺杆挤出,以研究加工过程中剪切对MCC颗粒在乙烯-乙烯醇(EVOH)中分散的影响矩阵。结果表明,高剪切螺杆构型对MCC颗粒的尺寸及其在EVOH基质中的原位原纤化和分布具有重要意义。与EVOH / MCC(LS)复合材料相比,EVOH / MCC的HS混合显着提高了挠曲强度和储能模量,

更新日期:2020-09-29
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