Table 2 Properties of poly (lactic acid)

Melting temperature

Tm = 230 < 240 °C

[61, 62]

Equilibrium Tm

Tm = 165–279 °C

[61,62,63]

Glass transition temperature (Tg)

Tg = 65–72 °C

[59, 62, 63]

Crystal form

Trigonal

[61, 64]

Melting enthalpy (ΔHm)

142–155 J/g

[62, 65]

Density

1.21–1.34 g/cm³

[66]

Tensile strength

80 Mpa

[59, 62, 65]

Young’s modulus

8.6 GPa

[67]

Elongation

30%

[59, 67]

Hydrolytic degradation

PLA fibers 40% ~ 25 days

[63]

Viscosity

At room 1.258 g/cm³ temperature

[66]

Permeability

Water   2954 ± 120

CO₂   32 ± 7

O₂   6 ± 0

[68]

Rockwell Hardness

~ 70–90

[67]