Rheo-Optical Studies of Polymeric Materials

X - ray crystallographic studies of polymeric materials

X-ray diffraction (XRD) studies are very usefu l for distinguishing crystalline and non-crystalline states. Highl y crystal line substances give patterns with sharp diffraction peaks or spots, whereas liquids or amorphous material s lie between these two extremes, because their chain length is large and it is difficult to attain three-dimensional regularity. However, XRD stud ies of polymers yi...

Optical Studies of Materials for Spectral Design

Optical material properties have been studied in a wide wavelength range. The aim is future use of spectral design for camouflage. The main characterization techniques used in this work are Reflection Spectroscopy, Scatterometry (BRDF) and Mueller Matrix Ellipsometry. Six camouflage evaluation criteria based on reflection, emissivity, polarization, gloss, dynamic coloring and broad band propert...

Gamma Radiation Studies on Optical Materials

Results for the effects of on materials for a new laser-driven accelerator are presented. Various optical and laser materials are compared. While Si and fused c-SiO appear ideal for sub-bandgap laser wavelengths, other interesting candidates include certain fluorides and compound semiconductors.

Polymeric triple-shape materials.

Shape-memory polymers represent a promising class of materials that can move from one shape to another in response to a stimulus such as heat. Thus far, these systems are dual-shape materials. Here, we report a triple-shape polymer able to change from a first shape (A) to a second shape (B) and from there to a third shape (C). Shapes B and C are recalled by subsequent temperature increases. Whe...

Polymeric Nanocomposite Materials