The primary dimension of any composite is the interface.  The interface is the area where the different materials in a composite coincide.  In order to have a successful, applicable composite, one must form an interface that is strong and favorable towards maximum compatibility.  A good interface is imperative for a material to survive under stress.
 
 

       In viewing the above graphic of a fiber reinforced matrix, one can see the presence of a medium that has both the characteristics of the fiber and the matrix.  The size of this gradient, the chemical interaction, and the number of gradients present in a composite determine the strength and application of the material.  The same concept holds true for blends.  The interphase created between the components must achieve some level of favorable interaction to prevent the materials from "keeping to themselves" or phase separating.  If phase separation occurs in a blend, then a combination of properties is likely to be unsuccessful.

For information on characterization of composite blends please click here:  Blends

1.  ESCA-Electron spectroscopy for chemical analysis
     XPS-X-ray photoelectron spectroscopy

2.  FTIR/ATR-Fourier transform infrared analysis/attenuated total reflectance

3.  STM-Scanning tunneling microscopy
     SEM-Scanning electron microscopy

4.  Thermal desorption

5.  Contact angle

6.  NMR-Nuclear magnetic resonance

7.  DSC-Differential scanning calorimetry

7.  Physical tests of fibers and matrices

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