Nomenclature and Greek Symbols
Eav	average adsorption energy (∆E/RT)
∆E	difference between energy of adsorption (Ea) and condensation (Ec) of water vapor
R	universal gas constant (J·mol−1·K−1)
T	temperature (K)
D	surface fractal dimension
A	effective area of films (m2)
∆m	the weight change of the permeation vessel (g)
t	time (s)
O600	transparency (AU/mm)
T600	transmittance at 600 nm (%)
Fmax	maximum force (N)
Ra	arithmetical mean deviation of the roughness profile (nm)
Rq	root-mean-square deviation of the roughness profile (nm)
Rp	maximum peak height of the roughness profile (nm)
Rv	maximum valley depth of the roughness profile (nm)
σf	failure stress (MPa)
εf	failure strain (%)
V	deformation velocities (mm/s)
δOH	OH bending vibrations
H-bonds	hydrogen bonding
Abbreviations
TPS/P	pure thermoplastic starch film
TPS/PH	thermoplastic starch film + psyllium husk
PH	psyllium husk
UV	ultraviolet
WVP	water vapor permeability (g·m−1 s−1 Pa−1)
RH	relative humidity (%)
WCA	water contact angle (deg)
SSA	specific surface area (m2/g)
WVTR	water vapor transmission (g/s)
AX	arabinoxylans