ABSTRACT
The properties of polymers are influenced by the crystalline morphology, which can be described in terms of lamallae, the radiating array of crystalline fibers, and the spherulites, which are polycrystalline aggregates with a radial symmetry. Polyphenylene sulfide is a high-performance engineering thermoplastic with excellent thermomechanical properties, good processability, and good chemical resistance. Polyethylene terephthalate is a versatile engineering plastic with excellent thermal and chemical resistance and mechanical performance. Sorption of gases by polymers has been a subject of interest because it brings about changes in the properties of polymers. The interaction of gases with polymers is similar to that of a solvent, that is, plasticization of polymers. Polyphenylenesulfide is generally reinforced with fibers for use in advanced composites. The isothermal crystallization studies are useful in elucidating the crystallizability of polymers. The response parameters used to monitor the process of crystallization in these techniques are different and require the data on the properties of the 100% crystalline polymer.
