Project | Indicator | Testing Method |
Intrinsic viscosity | 0.2-7.0dl/g (0.1%g/mL, Chloroform,25℃) |
Ubbelohde viscometer |
Viscosity-average Molecular Weight | 5000-70w | Ubbelohde viscosity method |
Glass transitiontemperature | 50-60℃ | Differential thermal analysis and differential scanning calorimetry |
remaining solvent | ≤70ppm | Gas chromatography |
Heavy metal | ≤10ppm | Burning residue method |
Optical rotation | a=0±0.01° | Polarimeter |
Lactide remains | ≤0.1% | Gas chromatography |
Water residue | ≤0.5% | Micro-meter Coulomb method |