Comparative study on the effect of manchurian ash and larch wood flour on mechanical property, morphology, and rheology of HDPE/wood flour composites

Abstract

Effects of wood flour species and polyethylene grafted with maleic anhydride (MA-PE) on mechanical properties and morphology and torque rheology of high density polyethylene (HDPE)/wood flour composites have been comparatively investigated. The results demonstrated that without compatbilizer, wood flour species exhibited little influence on mechanical properties. In the presence of MA-PE, the mechanical properties were obviously increased. On the basis of the mechanical property data obtained from wood flour extracted by different methods, the extractant was an important factor affecting the mechanical properties. Manchurian ash and larch wood flours extracted by hot water presented almost the same mechanical properties, and larch wood flour was the most beneficial to enhance the mechanical properties. The scanning electron microscopy (SEM) and the atomic force microscopy (AFM) further confirmed that interfacial adhesion and dispersion of manchurian ash wood flour in composites were effectively improved by MA-PE. The torque results demonstrated that the chemical reactions of maleic anhydride groups on MA-PE with hydroxyl on cellulose in wood flour probably took place due to the increase of the equilibrium torque and the appearance of the torque peak, and larch wood flour was more beneficial to prepare the composites containing the higher wood flour content.

Mechanical and thermal properties of oil palm wood sawdust reinforced post-consumer polyethylene composites

“…From Fig. 3b and c, it is evident that the matrix surface in the composites included a large number of empty spaces and agglomerations of sawdust 13 . This result is due to the presence of lignin and the OH groups on the cellulose, which bind the sawdust to form agglomerations 14 .…”

Influence of wood species and particle size on mechanical and thermal properties of wood polypropylene composites

“…Type of wood fillers is an important factor affecting the mechanical, physical, and thermal properties of WPCs due to its pore penetration, surface morphology, and chemical compositions such as cellulose, hemicellulose, lignin, and ash, which seriously affects the extent of interaction between the filler phases and matrix in a composite [16][17][18][19]. Thus, the effect of two types of wood flour and their particle sizes on mechanical, physical, and thermal properties of recycled polypropylene (rPP)/oil palm mesocarp flour (OMF) or rubberwood flour (RWF) composites were comparatively studied in the current work.…”

Research on the preparation and properties of foamed PP/wood flour composites

“…With the increase of the WF content, the MFI of the composites gradually decreased from 0.4 to 0.33 g/10 min. On one hand, the added MAH-g-PP could not only form ester bonds with WF, but also form physical interlocks with PP molecular chains, which resulted in the decreased flowability of the composites [21][22][23][24]. On the other hand, the excessive addition of WF could also result in the internal friction between WF particles.…”