Determination of avrami exponent by differential scanning calorimetry for non-isothermal crystallization of polymers

Polymer ◽  
1999 ◽  
Vol 40 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Kim Piew Chuah ◽  
S.N. Gan ◽  
K.K. Chee
Keyword(s):  
Differential Scanning Calorimetry ◽  
Isothermal Crystallization ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Crystallization Of Polymers

Isothermal Crystallization Behavior of PLA/PIL Composites

2015 ◽  
Vol 1096 ◽  
pp. 465-469
Author(s):  
Ping Zhou ◽  
Mi Zhou ◽  
Jing Ying Hu ◽  
Xin Qian
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ionic Liquid ◽  
Heterogeneous Nucleation ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Poly Ionic Liquid

The effect of Poly (ionic liquid) (PIL) on the crystallization of polylactide (PLA) has been investigated by means of differential scanning calorimetry. The nonisothermal crystallization result showed that PIL enhanced the crystallization of PLA. The Avrami method was used to describe the isothermal crystallization behavior of PLA/PIL composites. The Avrami exponent (n) revealed that the PIL accelerated PLA crystallization through heterogeneous nucleation.

Isothermal Crystallization of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization

2012 ◽  
Vol 271-272 ◽  
pp. 42-45
Author(s):  
Min Li ◽  
Li Guang Xiao ◽  
Hong Kai Zhao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystal Growth ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
In Situ Polymerization ◽  
Crystallization Rate ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Montmorillonite Nanocomposites

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The isothermal crystallization of PE/MMT nanocomposites at different MMT concentration (from 0.1 wt % to 1.2 wt %) was investigated by differential scanning calorimetry (DSC). The crystallization kinetics shows that the Avrami exponent of PE/MMT nanocomposites is decreased compared with pure PE, which indicates a decrease in the crystal growth dimension. This is attributed to the stems of PE crystals confined in the MMT layers. The crystallization rates of PE/MMT nanocomposites are faster than those of pure PE. However, when the content of MMT increases from 0.1 wt % to 1.2 wt %, the crystallization rate of PE/MMT nanocomposites is decreased.

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