Effect of extrusion screw speed on biocomposite thermo-mechanical properties

Figures & data

Table 1 Nominal properties of the materials used in this study.

Material	ρ (g/cm^3)	Melt flow index (g/10 min)	T m (°C)
PP 3825	0.91	30.0	165.5
AR 504	0.91	–	–
RR SFH	1.45	–	–

Table 2 Nomenclature and description of grades processed in this study.

	Weight percentage
Grade	PP	SFH	MAPP
PP00F00M	100	0	0
PP20F00M	80	20	0
PP20F02M	78	20	2

Figure 1 A plot of mean residence time calculated from feed to exit on an empty barrel using PP00F00M.

Figure 2 A comparison of calculated densities versus increasing screw speeds for the materials.

Figure 3 The average change in YI calculated using ASTM E-313 shown as a function of varying screw speeds.

Figure 4 The absorbance of vinylidene groups at the screw speeds investigated for (a) PP20F00M, (b) PP20F02M and (c) comparison of absorbances.

Figure 5 The FTIR spectra showing the hydroxyl (–OH) absorbances for the materials (a) PP20F00M, (b) PP20F02M and (c) comparison of absorbances.

Figure 6 The FTIR spectra for the carbonyl ester (–C = O) for (a) PP20F00M, (b) PP20F02M and (c) comparison of absorbances.

Figure 7 The variation in the CLTE as calculated using a controlled-force DMA experiment for the three materials.

Figure 8 The variation in the (a) elastic modulus and (b) tensile strength of the three composite grades.