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<p>This study aimed to replace poly(butylene adipate-co-terephthalate) (PBAT) by synthesizing poly(butylene sebacate-co-terephthalate) (PBSeT) copolyesters with 40–55&#xa0;mol% bio-based sebacic acid (Se) based on the total dicarboxylic acid content. The copolyesters exhibited molecular weight (M<sub>n</sub>), weight average molecular weight (M<sub>w</sub>), and polydispersity index (PDI) of 48,000–57,000&#xa0;g/mol, 117,000–142,000&#xa0;g/mol, and 2.43–2.51, respectively. Increasing the Se content reduced crystallinity, whereas glass transition, crystallization, and melting point temperatures increased with the dimethyl terephthalate content. At 45&#xa0;mol% Se, PBSe<sub>45</sub>T exhibited mechanical properties similar to those of PBAT (31&#xa0;MPa tensile strength, 766% elongation at break). A higher Se content accelerated PBSeT degradation, which is faster than PBAT degradation. Under enzymatic conditions, M<sub>n</sub>, M<sub>w</sub>, and PDI decreased, indicating chain scission. Furthermore, crystallinity increased because of the preferential decomposition of amorphous regions. After 24 weeks in soil, the remaining weight was 82%–98%. The residual weight in seawater was 94%–98%, suggesting slower degradation. The accelerated degradation with increasing Se content was attributed to reduced crystallinity, increased hydrophilicity, and enhanced enzyme compatibility. Thus, PBSe<sub>45</sub>T showed thermal and mechanical properties similar to those of PBAT with accelerated degradation, indicating its potential in sustainable flexible packaging applications.</p>

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Synthesis of poly(butylene sebacate-co-terephthalate) copolyesters: impact of bio-based sebacic acid content on properties and biodegradability under different environmental conditions

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Gunhee Park,
  • Sangwoo Kwon,
  • Hyunho Jang,
  • Su-il Park

摘要

This study aimed to replace poly(butylene adipate-co-terephthalate) (PBAT) by synthesizing poly(butylene sebacate-co-terephthalate) (PBSeT) copolyesters with 40–55 mol% bio-based sebacic acid (Se) based on the total dicarboxylic acid content. The copolyesters exhibited molecular weight (Mn), weight average molecular weight (Mw), and polydispersity index (PDI) of 48,000–57,000 g/mol, 117,000–142,000 g/mol, and 2.43–2.51, respectively. Increasing the Se content reduced crystallinity, whereas glass transition, crystallization, and melting point temperatures increased with the dimethyl terephthalate content. At 45 mol% Se, PBSe45T exhibited mechanical properties similar to those of PBAT (31 MPa tensile strength, 766% elongation at break). A higher Se content accelerated PBSeT degradation, which is faster than PBAT degradation. Under enzymatic conditions, Mn, Mw, and PDI decreased, indicating chain scission. Furthermore, crystallinity increased because of the preferential decomposition of amorphous regions. After 24 weeks in soil, the remaining weight was 82%–98%. The residual weight in seawater was 94%–98%, suggesting slower degradation. The accelerated degradation with increasing Se content was attributed to reduced crystallinity, increased hydrophilicity, and enhanced enzyme compatibility. Thus, PBSe45T showed thermal and mechanical properties similar to those of PBAT with accelerated degradation, indicating its potential in sustainable flexible packaging applications.