What is segmental motion in polymer?

What is segmental motion in polymer?

It has been suggested that the glass transition of highly branched polymeric materials is due to translational motion, rather than the large-scale segmental motion, which is defined as the glass transition for linear or moderately branched polymers.

What is segmental movement?

Segmentation contractions (or movements) are a type of intestinal motility. While peristalsis involves one-way motion in the caudal direction, segmentation contractions move chyme in both directions, which allows greater mixing with the secretions of the intestines.

How do polymer electrolytes work?

Polymer electrolytes Aligning or organizing the polymer chains enhances ionic conductivity; liquid crystalline chain polymers reach liquid-like conductivity values at heating (or when kept under polarization), which remain so upon cooling to room temperature.

How much is conductivity of polymer electrolyte?

It has been concluded that polymer electrolytes with low dc conductivity (≈10−10 S/cm) requires the activation energy for ion hopping to be large [114]. Therefore, the activation energy obtained from the reformulated Arrhenius equation is more satisfactory.

What kind of polymer has considerable segmental motion?

Elastomers are amorphous polymers. Considerable segmental motion is possible. At ambient temperatures, elastomers are relatively soft. Like plastics, elastomers can be thermoset or thermoplastic.

How are ion transport models used in polymer electrolytes?

Based on the patterns of dc conductivity (σdc) versus 1000/T, the ion transport models of Arrhenius and Vogel–Tammann–Fulcher (VTF) are discussed. Effects of coupling and decoupling between ionic motion and polymer segmental relaxation are analyzed.

What is the role of polar groups in polymer electrolytes?

This review article provides a deep insight into the ion conduction mechanism in polymer electrolytes (PEs). The concepts of different categories of polymer electrolytes are discussed. The significance of the existence of functional (polar) groups on the backbone of host polymers, which are used in polymer electrolytes, is well explained.

How are elastomers used to study segmental motion?

Elastomers are usually amorphous materials consisting of relatively long and entangled polymeric chains with high degree of flexibility and mobility. The entanglements are distantly connected in network structure. The distant network structure prevents the chains from flowing relative to each other when external force is applied.