Hybrid Composites from Wheat Straw, Inorganic Filler, and Recycled Polypropylene: Morphology and Mechanical and Thermal Expansion Performance

Table 2

Calculated interfacial energy and thermodynamical work of adhesion.

Interface type	(mJ/m^2)	WA (mJ/m^2)
PP-SiO2	1.11	58.27
PP-fly ash	−0.29	45.83
PP-heavy calcium carbonate	4.03	66.72
PP-straw	3.93	53.15