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<p>Poly(<i>L</i>-lactide) (PLA) is biodegradable but shows poor marine degradability at high molecular weights. Oligo(<i>L</i>-lactide) (OLA), a low-molecular-weight PLA, is marine-biodegradable but thermally unstable. To enhance thermal stability, terminal acylation using acetic, hexanoic, or benzoic groups was applied to OLA with DP 94 and 682. Acylation increased decomposition temperature by ~ 100℃ without affecting glass transition or melting temperatures. In marine biochemical oxygen demand (BOD) tests, aliphatic-capped OLA94 (OLA94Ac and OLA94He) retained biodegradability (~ 13%) similar to unmodified OLA94 (~ 15%), while benzoyl-capped OLA94 degraded less (~ 5%). Results support acylation as a strategy for thermally stable, marine-biodegradable PLA additives.</p> Graphical abstract <p></p>

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Effect of end capping acylation on thermal properties and marine degradability of acyl terminated oligo(L-lactide)

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Jin Ho Seok,
  • Tadahisa Iwata

摘要

Poly(L-lactide) (PLA) is biodegradable but shows poor marine degradability at high molecular weights. Oligo(L-lactide) (OLA), a low-molecular-weight PLA, is marine-biodegradable but thermally unstable. To enhance thermal stability, terminal acylation using acetic, hexanoic, or benzoic groups was applied to OLA with DP 94 and 682. Acylation increased decomposition temperature by ~ 100℃ without affecting glass transition or melting temperatures. In marine biochemical oxygen demand (BOD) tests, aliphatic-capped OLA94 (OLA94Ac and OLA94He) retained biodegradability (~ 13%) similar to unmodified OLA94 (~ 15%), while benzoyl-capped OLA94 degraded less (~ 5%). Results support acylation as a strategy for thermally stable, marine-biodegradable PLA additives.

Graphical abstract