The effect of crystallinity on the thermal conductivity of polymers

الملخص EN

The aim of this research is investigating the direct effect of crystallinity of thermoplastic polymers on their thermal conductivity values.

The study has included many materials, namely: polyoxymethylene (POM), high-density polyethylene (HDPE), low-density polypropylene (LDPE), polypropylene (PP), polyamide (PA) and polyethylene terephthalate (PET).

The degrees of crystallinity ranged from high-values (60-70% ), mid-values (30-40% ) and low-values (10-20% ).

The work has done theoretically and experimentally.

Theoretical work has used mathematical function extracted from reliable empirical relationships.

The experimental work has included: manufacturing the specimens; specifying the cooling procedure in order to get the required degree of crystallinity; measuring the coefficient of thermal conductivity for different polymers at various conditions; and finally analyze the data and introduce the experiences obtained from the investigation.

In general, theoretical values as well as experimental data were both behave similarly with respect to the variation of thermal conductivity with the degree of crystallinity.

The results show that by increasing the degree of crystallinity the thermal conductivity of the polymer has increased by 10-20% .

The aim of this research is investigating the direct effect of crystallinity of thermoplastic polymers on their thermal conductivity values.

The study has included many materials, namely: polyoxymethylene (POM), high-density polyethylene (HDPE), low-density polypropylene (LDPE), polypropylene (PP), polyamide (PA) and polyethylene terephthalate (PET).

The degrees of crystallinity ranged from high-values (60-70% ), mid-values (30-40% ) and low-values (10-20% ).

The work has done theoretically and experimentally.

Theoretical work has used mathematical function extracted from reliable empirical relationships.

The experimental work has included: manufacturing the specimens; specifying the cooling procedure in order to get the required degree of crystallinity; measuring the coefficient of thermal conductivity for different polymers at various conditions; and finally analyze the data and introduce the experiences obtained from the investigation.

In general, theoretical values as well as experimental data were both behave similarly with respect to the variation of thermal conductivity with the degree of crystallinity.

The results show that by increasing the degree of crystallinity the thermal conductivity of the polymer has increased by 10-20% .