Thermal and crystallinity property studies of poly (L-lactic acid) Blended with oligomers of 3-hydroxybutyrate or dendrimers of hydroxyalkanoic acids

Chengyang Ni, Rongcong Luo, Kaitian Xu, Guo Qiang Chen

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19 Scopus citations

Abstract

Poly (L-lactic acid) (PLA) is a biodegradable polymer with slow crystallization rate. Oligomers of 3hydroxybutyrate (OHB) and dendrimers of hydroxyalkanoic acids with different molecular weights were blended with PLA in a hope to improve the crystallization ability and thermal stability of PLA, respectively. Four thermallydegraded PHB products oligomers termed OHB-1, OHB-2, OHB-3, and OHB-4 with various number average molecular weights (Mn) of 4000, 7400, 14,000, and 83,000, respectively, were blended with PLA. The lower coldcrystallization temperature (Tcc) and higher heat of cold crystallization (ΔHcc) for blend of PLA/OHB-1 suggested that thermally-degraded OHB-1 formed suitablecrystal size during the cooling process and then acted as nucleation agents for PLA in the subsequent heating process. On the other hand, for the blending systems of PLA/dendrimers of hydroxyalkanoic acids, no obvious change on the thermal properties was observed compared with pure PLA except an improved PLA thermal stability possibly resulted from the crosslinking effects of the dendrimers

Original languageEnglish (US)
Pages (from-to)1720-1727
Number of pages8
JournalJournal of Applied Polymer Science
Volume111
Issue number4
DOIs
StatePublished - Feb 15 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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