A Group Contribution Model for the Prediction of the Thermal Conductivity of Polymer Melts

Abstract

A group contribution model was proposed for the prediction of the thermal conductivity of polymer melts. The model requires only the existing group contribution methods for the estimation of specific heats, densities, and melting temperatures in the calculation of thermal conductivity for polymer melts. For 11 polymer melt systems tested, predictive accuracy of the model is normally better than 10%. Because only group parameters are needed in the calculation, this model is predictive and is very convenient for practical use.

New Model for the Prediction of the Pressure Dependence of Thermal Conductivity of Polymer Melts

“…As a second step to test our proposed model, we used the proposed model to predict the thermal conductivity of polymer melts at high pressures without using any experimental thermal conductivity data. In this case the 0.1 MPa thermal conductivity at a certain temperature was predicted by the group contribution model developed in our previous work . The predicted results are also shown in Table .…”

“…In this case the 0.1 MPa thermal conductivity at a certain temperature was predicted by the group contribution model developed in our previous work. 20 The predicted results are also shown in Table 2. For most systems the AAD is within 10%, and the largest one is 22.9% for isotactic polypropylene (i-PP), which may be caused by the large error in the prediction a AADλ ) (1/N)∑(|λi calcλi exp |/λi exp ) × 100.…”

“…Equation 13 is the new model proposed in this work, which can be used to predict the pressure dependence of the thermal conductivity of polymer melts as long as the Tait equation parameters B 0 and B 1 and the thermal conductivity at 0.1 MPa are known. On the other hand, if the required λ( T ,0.1MPa) is not available, it can be predicted easily with the group contribution model proposed in our previous work . The combination of the two models enables us to predict the thermal conductivity of polymer melts for a wide temperature and pressure range as long as the required group parameters and the Tait equation parameters are known.…”

“…]} (11) λ(P)λ(0) λ(P) predicted easily with the group contribution model proposed in our previous work. 20 The combination of the two models enables us to predict the thermal conductivity of polymer melts for a wide temperature and pressure range as long as the required group parameters and the Tait equation parameters are known.…”

Microwave-induced combustion process variables for MgO nanoparticle synthesis using polyethylene glycol and sorbitol

“…The thermodynamic data for various reactants and products, which is required for calculation of the ATR, is presented in Table 2. [23][24][25] The enthalpy of combustion ( H • ) can be expressed as:…”