Author | Fran Adar

Articles

2D COS of Temperature-Dependent Raman Spectra of Amorphous, Nonoriented Polyethylene Terephthalate to Separate Molecular Conformational Changes from True Crystallization

June 01, 2018

Spectroscopy

Article

Because of the structural use of polymers, it is important to understand the origin of their strength, elongation to break, elasticity, flexibility, and so on. It is in the very low frequency region (the so called “terahertz” range) where it is believed that the real indicators for crystallinity appear.

Use of 2D COS to Tease Out Structural Information on Polymers

February 01, 2018

Spectroscopy

Article

This introduction to two-dimensional correlation spectroscopy (2D COS) illustrates how to understand the structural changes occurring in polyester molecules in the fibers as they are annealed under tension.

Raman Microscopy Combined with Tensile Deformation for Understanding Changes in Polymer Morphology

November 01, 2017

Spectroscopy

Article

We show Raman spectra of polymeric fibers acquired as a function of increasing stress and temperature. With knowledge of Raman band assignments, it becomes possible to understand, in detail, the molecular changes that are responsible for polymer orientation and crystallization.