Thermal properties and isothermal crystallization of syndiotactic polypropylenes: Differential scanning calorimetry and overall crystallization kinetics

2000 ◽  
Vol 75 (1) ◽  
pp. 44-59 ◽  
Author(s):  
Pitt Supaphol ◽  
Joseph E. Spruiell
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Scanning Calorimetry

Research in Non-Isothermal Crystallization Kinetics of LDPE Composite Films

2013 ◽  
Vol 848 ◽  
pp. 46-49
Author(s):  
Zi Nian Zhao ◽  
Xiao Li Lei
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystallization Kinetics ◽  
Heterogeneous Nucleation ◽  
Isothermal Crystallization ◽  
Composite System ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Isothermal Crystallization Kinetics ◽  
Inorganic Particles ◽  
Kinetics Of

By means of melt blending process in a co-rotating twin screw extruder and blow molding , the low density polyethylene (LDPE)/thermoplastic elastomer(TPE) mixed membranes and LDPE/inorganic particles composite membrane were prepared. by differential scanning calorimetry(DSC) to study the non-isothermal crystallization kinetics of the LDPE composite system by differential scanning calorimetry (DSC).Use modified Jeziorny method to process the data ,the results shows that ZMS, SiO2, EVA and EMAA all play a role of heterogeneous nucleation and the crystallization rate of LDPE has been increased,especially the ZMS/LDPE composite system which heterogeneous nucleation is more obvious and crystallization rate is faster.

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.

Sign in / Sign up

Export Citation Format

Share Document