Research Article

A Facile Approach for the Mass Production of Submicro/Micro Poly (Lactic Acid) Fibrous Mats and Their Cytotoxicity Test towards Neural Stem Cells

Table 1

Properties of the solvents used in this study [29].

SolventsMolecular structureMolecular formulaBoiling point (°C)Acidity (pKa)Viscosity mPa s (at 20°C)Surface tension (mN/m)Solubility parameter (cal1/2 cm−3/2)Dielectric constantElectrical conductivity (µs/cm−1)Molar mass
g mol−1

Chloroform CHCl36115.7 (20 °C)0.562794.81 × 10−4119.38
DCM
(dichloromethane)
CH2Cl2400.45281094 × 10−584.93
DMF
(dimethylformamide)
C3H7NO1530.923512376 × 10−273.09
TFA
(trifluoroacetic acid)
C2HF3O2720.231.872.5114.02

The electric dipole moment is a measure of the separation of positive and negative electrical charges in a system of electric charges, that is, a measure of the charge system’s overall polarity.
Surface tension: TFA > DMF > DCM > CHLOROFORM.
Electric conductivity: TFA > DMF > CHLOROFORM > DCM.
Dielectric constant: TFA > DMF > DCM > CHLOROFORM.
Boiling point (°C): DMF > TFA > CHLOROFORM > DCM.