Effect of low octavinyl-polyhedral oligomeric silsesquioxanes loadings on the melt crystallization and morphology of biodegradable poly(l-lactide)

2011 ◽  
Vol 519 (1-2) ◽  
pp. 90-95 ◽  
Author(s):  
Jing Yu ◽  
Zhaobin Qiu
Keyword(s):  
Melt Crystallization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Biodegradable Poly

Effect of Sodium Benzoate on the Crystallization Behavior of Poly (3-Hydroxybutyrate-Co-4-Hydroxybutyrate)

2014 ◽  
Vol 665 ◽  
pp. 375-378 ◽  
Author(s):  
Xiao Ping Wang ◽  
Wen Feng Li ◽  
Hao Zhang ◽  
De Ming Jia
Keyword(s):  
Activation Energy ◽  
Sodium Benzoate ◽  
Mechanical Performance ◽  
Crystallization Rate ◽  
Melt Crystallization ◽  
Crystalline Morphology ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Biodegradable Poly

Poly (3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB), as the latest generation of biosynthesis and biodegradable Poly (β-hydroxyalkanoate) material, its mechanical performance is greatly improved while its application in industry is confined for the inadequate crystallization properties. The effect of sodium benzoate on P34HB’s crystallization behaviors and nucleation mechanism were investigated through differential scanning calorimetry (DSC) and Angle X-ray diffraction (WAXD). WAXD analysis indicated that the adding of sodium benzoate did not chang the crystalline morphology of P34HB. The analysis of the kinetic parameters including the activation energy (ΔEc) of the non-isothermal melt-crystallization were carried out, which demonstrated that both of the Mo crystallization rate parameter and the Kissinger activation energy value are found to be sharply dropped with the addition of sodium benzoate. Compared to pure P34HB, F(T) on 80 % crystallinity of P34HB with 0.25 phr sodium benzoate fell from 38.79 to 17.89, and ΔEc decreased from-63.1 KJ·mol-1 to-108.8 KJ·mol-1, which indicated that the application of sodium benzoate can obviously improve the crystallization rate of P34HB.

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