Table 2.

Properties of poly (lactic acid)

Properties	Value	Refs.
Melting temperature	Tm = 230 < 240 °C	[61, 62]
Equilibrium Tm	Tm = 165–279 °C	[61–63]
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]