Density
The volumetric mass density of a substance is its mass per unit volume. The symbol most often used for density is ρ (sometime d also). Mathematically, density is defined as mass divided by volume.
ρ = m/v
Where,
ρ = density
m= mass
V = volume
Density measurement by DGC (Density Gradient Column)
This method of Density measurement should be performed according to ASTM D1505.
Measurement of crystallinity by density method
Volume fraction crystallinity can be calculated by using the following equation
`Xv(%)=\frac{do-da}{dc-da}\times 100`
Where,
Xv is the volume fraction crystallinity
do the density of the experimental sample
dc the density of pure crystallinity
da the density of pure amorphous area
Mass fraction crystallinity can be measured by following formulas
`Xm(%) = \frac{Va-Vo}{Va-Vc} \times 100`
Where,
Xm is the mass fraction crstallinity
Vo is the specific volume of the experimental sample
Va is the specific volume of the pure amorphous area
Vc is the volume of the pure crystalline area.
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