Tuesday 23 August 2022

Plastic Multipoint Design Data: Specific Heat Capacity as a function of Temperature

Hello and welcome to a new blog post. Today I will show you another set of multipoint design data: specific heat capacity as a function of temperature. 

In a previous post I presented to you the Global Warming Potential (GWP) as a function of the heat capacity. However, the heat capacity values were limited to one temperature only (20°C). 

Increasing the temperature of a polymer by a dT at constant pressure is the result of a specific amount of heat supplied to the system. This is referred to as specific heat. 

Figure 1 presents the specific heat of amorphous and semi crystalline unfilled polymers. With increasing temperature the specific heat of both amorphous and semi crystalline polymers is increasing.


Figure 1: Specific heat capacity Cp as a function of temperature of amorphous and semi crystalline unfilled polymers.

There are several calculations in polymer engineering where the specific heat value of a certain polymer is needed: 

-calculation of the pressure drop along the gate or runner of an injection mould 

-dimensioning extrusion dies

-thermal design of moulds

-predicting the flow length of spiral melt flows

-polymer material selection for thermal management applications (thermal diffusivity)

Here you can find further design property data of various polymers for your part design and material selection. 

Thanks for your reading and #findoutaboutplastics


Herwig Juster

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[1] VDI Wärmeatlas

[2] Griesinger: Wärmemanagement in der Elektronik

[3] Natti: Design Formulas for Plastics Engineering 

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