The sessile drop method was used to determine the contact
angle with a contact angle goniometer and an optical subsystem
to capture the profile of a liquid on a solid substrate. The angle
formed between the liquid/solid interface and the liquid/vapor
interface was the contact angle. The degradation in soil was mea-sured after being mixed with soil for 30 days. The biodegradation
of the resulting sample in soil was obtained according to the Eq. (4).
For thermal analysis, a TGA7 (Perkin Elmer) was used for testing a
sample (5–6 mg) under N2 with a flow rate of 45 mL/min, from 50
to 850 ◦C at a heating rate of 10 ◦C/min