Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone

Sangwoork Park, Youngkyu Chang, Jun Hyung Cho, Icksam Noh, Chulhee Kim, Soo Hyun Kim, Young Ha Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Copolymers of L-lactic acid with ε-caprolactone were prepared to provide poly (L-lactic acid) with flexibility and thermal stability. L-Lactic acid and ε-caprolactone were "one-pot" polymerized in the presence of Sb2O3 as a catalyst and dipentaerythritol (DIPET) as an initiator. Molecular weights of the copolymers were remarkably increased by the addition of DIPET. The copolymers were amorphous when the L-lactic acid composition was in the range of 20-90%, while the homopolymer of L-lactic acid and ε-caprolactone were semicrystalline. The glass transition temperatures(Tg) of the copolymers were in the range of -48°C-43°C and decreased as the content of ε-caprolactone was increased. Initial thermal decomposition temperatures(Td) of the copolymers were 212°C-289°C, which were higher than the Td of poly(L-lactic acid), 168°C.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalPolymer (Korea)
Volume22
Issue number1
Publication statusPublished - 1998 Dec 1
Externally publishedYes

Fingerprint

Lactic acid
Lactic Acid
Thermodynamic properties
Copolymers
Pyrolysis
Homopolymerization
Thermodynamic stability
Molecular weight
caprolactone
Temperature
Catalysts
Chemical analysis
poly(lactic acid)

Keywords

  • ε-caprolactone
  • Copolyester
  • Dipentaerythritol
  • L-lactic acid

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Park, S., Chang, Y., Cho, J. H., Noh, I., Kim, C., Kim, S. H., & Kim, Y. H. (1998). Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone. Polymer (Korea), 22(1), 1-5.

Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone. / Park, Sangwoork; Chang, Youngkyu; Cho, Jun Hyung; Noh, Icksam; Kim, Chulhee; Kim, Soo Hyun; Kim, Young Ha.

In: Polymer (Korea), Vol. 22, No. 1, 01.12.1998, p. 1-5.

Research output: Contribution to journalArticle

Park, S, Chang, Y, Cho, JH, Noh, I, Kim, C, Kim, SH & Kim, YH 1998, 'Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone', Polymer (Korea), vol. 22, no. 1, pp. 1-5.
Park S, Chang Y, Cho JH, Noh I, Kim C, Kim SH et al. Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone. Polymer (Korea). 1998 Dec 1;22(1):1-5.
Park, Sangwoork ; Chang, Youngkyu ; Cho, Jun Hyung ; Noh, Icksam ; Kim, Chulhee ; Kim, Soo Hyun ; Kim, Young Ha. / Synthesis and thermal properties of copolymers of L-lactic acid and ε-caprolactone. In: Polymer (Korea). 1998 ; Vol. 22, No. 1. pp. 1-5.
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N2 - Copolymers of L-lactic acid with ε-caprolactone were prepared to provide poly (L-lactic acid) with flexibility and thermal stability. L-Lactic acid and ε-caprolactone were "one-pot" polymerized in the presence of Sb2O3 as a catalyst and dipentaerythritol (DIPET) as an initiator. Molecular weights of the copolymers were remarkably increased by the addition of DIPET. The copolymers were amorphous when the L-lactic acid composition was in the range of 20-90%, while the homopolymer of L-lactic acid and ε-caprolactone were semicrystalline. The glass transition temperatures(Tg) of the copolymers were in the range of -48°C-43°C and decreased as the content of ε-caprolactone was increased. Initial thermal decomposition temperatures(Td) of the copolymers were 212°C-289°C, which were higher than the Td of poly(L-lactic acid), 168°C.

AB - Copolymers of L-lactic acid with ε-caprolactone were prepared to provide poly (L-lactic acid) with flexibility and thermal stability. L-Lactic acid and ε-caprolactone were "one-pot" polymerized in the presence of Sb2O3 as a catalyst and dipentaerythritol (DIPET) as an initiator. Molecular weights of the copolymers were remarkably increased by the addition of DIPET. The copolymers were amorphous when the L-lactic acid composition was in the range of 20-90%, while the homopolymer of L-lactic acid and ε-caprolactone were semicrystalline. The glass transition temperatures(Tg) of the copolymers were in the range of -48°C-43°C and decreased as the content of ε-caprolactone was increased. Initial thermal decomposition temperatures(Td) of the copolymers were 212°C-289°C, which were higher than the Td of poly(L-lactic acid), 168°C.

KW - ε-caprolactone

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