Table 3. Thicknesses and mechanical properties (TS, EB) of SPI-based films.

Sample	Thickness (mm)	Tensile strength (MPa)	Elongation at break (%)
SPI	0.35	2.25	141.28
SPI/PVA	0.28	3.66	123.63
SPI/PTGE	0.28	5.79	102.90
SPI/HNTs	0.20	3.14	106.92
SPI/HNTs/PVA/PTGE	0.26	9.66	140.14