1. Introduction
The packaging materials can act as a thermal oven in a microwave. The different materials used for packaging
are described and their thermal and electrical properties compared [1]. Their thermal properties are quite important
because they may be heated by food packaging. And some hot points may happen to appear and damage the
package, leading to a large number of consequences, mainly diffusion.
Isotactic polypropylene (iPP) is very interesting and meaningful work, but mechanical properties of semicrystalline
polymers are mainly dependent on their molecular weight, the nature of the crystal phase, crystallinity
and spherulite size [2]. iPP was ordered of methyl group structure compared with syndiotactic and atactic
polypropylene. iPP exhibits several polymorphs ((orm,