Structural, thermal and physico-chemical properties of high density polyethylene/natural rubber/modified cassava starch blends

2017 ◽  
Vol 26 (2) ◽  
pp. 149-159 ◽  
Author(s):  
A. W. M. Kahar ◽  
N. Sarifuddin ◽  
H. Ismail
Keyword(s):  
Natural Rubber ◽  
High Density Polyethylene ◽  
Chemical Properties ◽  
Cassava Starch ◽  
High Density ◽  
Physico Chemical ◽  
Starch Blends

Unsteady bi-directional heat transfer with heat generation by crystallization in high-density polyethylene

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Wadou Baré ◽  
Carmen Albano ◽  
José Papa ◽  
Luis León
Keyword(s):  
Heat Transfer ◽  
Temperature Profile ◽  
Heat Generation ◽  
High Density Polyethylene ◽  
Chemical Properties ◽  
High Density ◽  
Temperature Profiles ◽  
Scanning Calorimetry ◽  
Physico Chemical ◽  
Simulated Temperature

AbstractA method of coupling the heat transfer during the cooling process of a molten sample of high-density polyethylene (HDPE) and the heat released by crystallization is presented. From the simulated temperature profiles it is possible to obtain the thermal diffusivity, which is one of the physico-chemical properties characterizing heat transfer under non-stationary conditions. Using suitable initial and boundary conditions, it was possible to solve the heat equation analytically. The results obtained for HDPE, using the diffusivity α = 0.00197 cm2/s, show an increase in the temperature profile when the term due to crystallization is taken into account, compared to the temperature profiles without heat generation between 140 - 110°C. This temperature range, where crystallization of HDPE occurs, was determined using differential scanning calorimetry. A cylindrical conductivity cell was constructed with a thermocouple placed at varying positions. Comparing the simulated temperature profiles including heat generation by crystallization with the experimental data, we find that in the latter case the increase in the temperature profile was less significant; this is probably due to the assumptions made in the development of the kinetic equation.

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