*2.1.3 Polycaprolactone*

PCL is a semicrystalline polymer fabricated by means of ring polymerization of caprolactone in the presence of a catalyst [1, 7]. It is considered a synthetic biopolymer fabricated from a nonrenewable resource, and similar to PLA, PCL is a hydrophobic polymer with a low degradation rate [18]. Additionally, compared to PCL, the average tensile strength is lower, but it is important to note its high elongation at break being comparable to that of LDPE. Nevertheless, its high cost of processing and non-renewability are major drawbacks in the context of sustainable design.

To that end, in spite of the several advantages offered by synthetic polymers such as compatible properties and easy processing, they are considered very expensive to produce [6]. Also, from a sustainability point of view, they offer a weak competition, with some being nonrenewable such as PCL and partially degradable as PLA. This dictates the importance of the agro-/natural polymers that are inherently both biodegradable and biorenewable as well as being cheaper to


**Table 3.** *Comparison between biodegradable polymers [16, 18, 20, 21].* produce. Owing to their attractive attributes, this category provides a promising sustainable candidate for green product design over their synthetic equivalents.
