Crystallizability of substituted poly(lactic acid)s: Effects of alkyl side-chain structure

Hironori Marubayashi, Ryo Mizukami, Yuji Hamada, Shuichi Nojima

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4 Citations (Scopus)


The side-chain-substituted poly(lactic acid)s (SPLAs) having C3–C4 alkyl side chains (Pr, iPr, n-Bu, iBu, and s-Bu for propyl, isopropyl, n-butyl, isobutyl, and sec-butyl groups, respectively) were synthesized from L-amino acids, and their crystallizability was systematically investigated (unknown for Pr, n-Bu, and s-Bu but already known for iPr and iBu). s-Bu was found to be a crystalline polymer like iPr, whereas Pr and n-Bu had no or very little crystallizability like iBu. The crystal structure, melting behavior, and crystallization rate of s-Bu were examined in detail. The crystal structure and crystallinity (ca. 60%) of s-Bu were not affected at all by the crystallization temperature and casting solvent. The melting temperature and spherulite growth rate of s-Bu were compared with those of iPr and referenced data of SPLA with methyl side chains (Me) [i.e., poly(L-lactic acid)] and that with ethyl side chains (Et) [i.e., poly(L-2-hydroxybutanoic acid)]. The magnitude relation among melting temperatures of SPLAs would be iPr > s-Bu > Me > Et, and that among spherulite growth rates iPr > Me ≈ s-Bu > Et.

Original languageEnglish
Pages (from-to)318-324
Number of pages7
JournalPolymer Degradation and Stability
Publication statusPublished - 2018 Jul


  • Crystal structure
  • Crystallinity
  • Crystallizability
  • Crystallization
  • Crystallization rate
  • Melting temperature
  • Sec-butyl group
  • Side chain
  • Substituent effect
  • Substituted poly(lactic acid)


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