poly(ethylene succinate)
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| CASNo = 25569-53-3
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| Section2 = {{Chembox Properties
| Formula = (C6H8O4)n
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| MeltingPtC = 103–106
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Poly(ethylene succinate) (PES) is an aliphatic synthetic polyester with a melting point from 103–106 °C. It is synthesized from dicarboxylic acids; either by ring-opening polymerization of succinic anhydride with ethylene oxide or by polycondensation of succinic acid and ethylene glycol.{{cite journal|pmc=2769161 |journal=International Journal of Molecular Sciences|title=Biodegradability of Plastics|author1=Yutaka Tokiwa|author2=Buenaventurada P. Calabia|author3=Charles U. Ugwu|author4=Seiichi Aiba|pages=3722–3742|date=September 2009|volume=10|issue=9|pmid=19865515|doi=10.3390/ijms10093722|doi-access=free}} Thermophilic Bacillus sp. TT96 is found in soil and can degrade PES. Mesophilic PES degrading microorganisms were found in the Bacillus and Paenibacillus species; strain KT102; a relative of Bacillus pumilus was the most capable of degrading PES film. The fungal species NKCM1003 a type of Aspergillus clavatus also degrades PES film. The solubility of lithium salts (e.g. lithium perchlorate, LiClO4) in PES made it a good alternative to poly(ethylene oxide) (PEO) during early development of solid polymer electrolytes for lithium ion batteries.{{Cite journal|last1=Watanabe|first1=Masayoshi|last2=Rikukawa|first2=Masahiro|last3=Sanui|first3=Kohei|last4=Ogata|first4=Naoya|last5=Kato|first5=Hisaaki|last6=Kobayashi|first6=Tadahiko|last7=Ohtaki|first7=Zentaro|date=1984|title=Ionic conductivity of polymer complexes formed by poly(ethylene succinate) and lithium perchlorate|journal=Macromolecules|language=EN|volume=17|issue=12|pages=2902–2908|doi=10.1021/ma00142a078|bibcode=1984MaMol..17.2902W|issn=0024-9297}}