Effects of L-Phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

Rongcong Luo, Kaitian Xu, Guoqiang Chen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L-Phenylalanine (L-PH) was used to improve the crystallization rate of PHBHHx. The nonisothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx-PH samples were characterized and compared with differential scanning calorimetry. At cooling rates of 2, 5, 10, and 20°C/min, PHBHHx/L-PH could crystallize at higher temperatures than pure PHBHHx. A modified Avrami equation based analysis showed that the addition of L-PH shortened the half-time of crystallization of PHBHHx from 9.6 to 8.0 min and increased the composite rate constant of PHBHHx from 0.201 to 0.283 during the nonisothermal crystallization process at a cooling rate of 10°C/min. For other cooling rates, similar trends of changes were observed. These indicated a faster crystallization rate of PHBHHx in the presence of L-PH. PHBHHx/L-PH samples showed a higher melting temperature and a sharper melting peak than those of the pure PHBHHx, which suggested that L-PH as a nucleation agent improved the perfection of the PHBHHx crystals. Stress-strain measurements showed that both PHBHHx and PHBHHx/L-PH maintained their ductile and elastic properties during the 60 days of the aging study.

Original languageEnglish (US)
Pages (from-to)2950-2956
Number of pages7
JournalJournal of Applied Polymer Science
Volume110
Issue number5
DOIs
StatePublished - Dec 5 2008

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Crystallization
Phenylalanine
Melting
Nucleation
Mechanical properties
Cooling
Crystallization kinetics
Strain measurement
Stress measurement
Thermoplastics
Melting point
Differential scanning calorimetry
Rate constants
Aging of materials
poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)
Crystals
Composite materials
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Effects of L-Phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)",
abstract = "Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L-Phenylalanine (L-PH) was used to improve the crystallization rate of PHBHHx. The nonisothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx-PH samples were characterized and compared with differential scanning calorimetry. At cooling rates of 2, 5, 10, and 20°C/min, PHBHHx/L-PH could crystallize at higher temperatures than pure PHBHHx. A modified Avrami equation based analysis showed that the addition of L-PH shortened the half-time of crystallization of PHBHHx from 9.6 to 8.0 min and increased the composite rate constant of PHBHHx from 0.201 to 0.283 during the nonisothermal crystallization process at a cooling rate of 10°C/min. For other cooling rates, similar trends of changes were observed. These indicated a faster crystallization rate of PHBHHx in the presence of L-PH. PHBHHx/L-PH samples showed a higher melting temperature and a sharper melting peak than those of the pure PHBHHx, which suggested that L-PH as a nucleation agent improved the perfection of the PHBHHx crystals. Stress-strain measurements showed that both PHBHHx and PHBHHx/L-PH maintained their ductile and elastic properties during the 60 days of the aging study.",
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Effects of L-Phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate). / Luo, Rongcong; Xu, Kaitian; Chen, Guoqiang.

In: Journal of Applied Polymer Science, Vol. 110, No. 5, 05.12.2008, p. 2950-2956.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of L-Phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

AU - Luo, Rongcong

AU - Xu, Kaitian

AU - Chen, Guoqiang

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N2 - Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L-Phenylalanine (L-PH) was used to improve the crystallization rate of PHBHHx. The nonisothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx-PH samples were characterized and compared with differential scanning calorimetry. At cooling rates of 2, 5, 10, and 20°C/min, PHBHHx/L-PH could crystallize at higher temperatures than pure PHBHHx. A modified Avrami equation based analysis showed that the addition of L-PH shortened the half-time of crystallization of PHBHHx from 9.6 to 8.0 min and increased the composite rate constant of PHBHHx from 0.201 to 0.283 during the nonisothermal crystallization process at a cooling rate of 10°C/min. For other cooling rates, similar trends of changes were observed. These indicated a faster crystallization rate of PHBHHx in the presence of L-PH. PHBHHx/L-PH samples showed a higher melting temperature and a sharper melting peak than those of the pure PHBHHx, which suggested that L-PH as a nucleation agent improved the perfection of the PHBHHx crystals. Stress-strain measurements showed that both PHBHHx and PHBHHx/L-PH maintained their ductile and elastic properties during the 60 days of the aging study.

AB - Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L-Phenylalanine (L-PH) was used to improve the crystallization rate of PHBHHx. The nonisothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx-PH samples were characterized and compared with differential scanning calorimetry. At cooling rates of 2, 5, 10, and 20°C/min, PHBHHx/L-PH could crystallize at higher temperatures than pure PHBHHx. A modified Avrami equation based analysis showed that the addition of L-PH shortened the half-time of crystallization of PHBHHx from 9.6 to 8.0 min and increased the composite rate constant of PHBHHx from 0.201 to 0.283 during the nonisothermal crystallization process at a cooling rate of 10°C/min. For other cooling rates, similar trends of changes were observed. These indicated a faster crystallization rate of PHBHHx in the presence of L-PH. PHBHHx/L-PH samples showed a higher melting temperature and a sharper melting peak than those of the pure PHBHHx, which suggested that L-PH as a nucleation agent improved the perfection of the PHBHHx crystals. Stress-strain measurements showed that both PHBHHx and PHBHHx/L-PH maintained their ductile and elastic properties during the 60 days of the aging study.

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