Crystalline Polymers

Crystalline polymers are polymers in which the molecular chains are arranged in ordered, repeated structures known as crystallites. The tightly packed structures create polymers that have a distinct melting temperature (Tm), at which the crystalline regions transition from solid to liquid. Crystalline polymers tend to exhibit higher density and stiffness compared to amorphous polymers but typically shrink more as they cool. They often have an opaque finish.

Many commercial plastics are semi-crystalline, containing both ordered (crystalline) and disordered (amorphous) regions.

Crystalline polymers contribute to the mechanical and thermal performance of plastic materials. Their ordered molecular structures increase the strength, chemical resistance and barrier performance of a material.

M. Holland helps customers select the right material type for performance, appearance and manufacturability. By working closely with suppliers and customers, M. Holland provides guidance on how polymer structure influences end-use performance and processing outcomes.