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Citation: ZHAO Hui, DONG Wei-Min, ZHANG Xue-Quan, MEN Yong-Feng. Crystallization and Melting Behavior of cis-1,4-Polybutadiene Analyzed by Differential Scanning Calorimetry[J]. Chinese Journal of Applied Chemistry, ;2008, 25(10): 1233-1236. shu

Crystallization and Melting Behavior of cis-1,4-Polybutadiene Analyzed by Differential Scanning Calorimetry

1.
a State Key Laboratory of Polymer Physics and Chemistry;
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b Laboratory of Polymer Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: MEN Yong-Feng,
Received Date: 9 October 2007
Available Online: 24 October 2007

The isothermal crystallization process and subsequent melting behavior of a cis-1,4-polybutadiene(PB) sample were investigated by differential scanning calorimetry(DSC).It was found that there existed a perfection process of crystals at the late stage of the isothermal crystallization process.In addition,the rate of crystallization decreased with an increase of the crystallization temperature.Melting of the PB crystals always starts at about 2℃ above the crystallization temperature.At a heating rate of 10℃/min,DSC thermogram shows a broad distribution of melting temperatures with a smaller shoulder on the low-temperature side,indicating that this sample possesses crystallites with different stabilities after isothermal crystallization.By extrapolating the melting points to zero crystallinity(X_c=0) or infinite long crystallization time(t_c^-1=0),we determined the equilibrium melting point T_m^∞ of this PB specimen to be in between 9 and 17.6℃ according to the Hoffman-Weeks approach.
- DSC,
- cis-polybutadiene,
- crystallization,
- melting
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