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

doi:10.1002/app.29182

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

Biomedical Engineering

Research output: Contribution to journal › Article › peer-review

24 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 (M_n) of 4000, 7400, 14,000, and 83,000, respectively, were blended with PLA. The lower coldcrystallization temperature (T_cc) and higher heat of cold crystallization (ΔH_cc) 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 language	English (US)
Pages (from-to)	1720-1727
Number of pages	8
Journal	Journal of Applied Polymer Science
Volume	111
Issue number	4
DOIs	https://doi.org/10.1002/app.29182
State	Published - Feb 15 2009

All Science Journal Classification (ASJC) codes

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

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

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",

author = "Chengyang Ni and Rongcong Luo and Kaitian Xu and Chen, {Guo Qiang}",

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AU - Ni, Chengyang

AU - Luo, Rongcong

AU - Xu, Kaitian

AU - Chen, Guo Qiang

PY - 2009/2/15

Y1 - 2009/2/15

N2 - 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

AB - 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

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

Abstract

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