A different monomer with two identical functional groups, such as a dioyl dichloride or dioic acid is required to continue the process of polymerization through repeated esterification processes.
Monomer yang berbeda dengan dua gugus fungsional identik, seperti dioil diklorida atau asam dioat diperlukan untuk melanjutkan proses polimerisasi melalui proses esterifikasi berulang.