Polymers 
      Polymers 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
                 semicrystalline poly(3-hydroxybuyrate)
                 semicrystalline poly(3-hydroxybuyrate)
         note amorphous scattering region
         note amorphous scattering region
                              
      Polymers 
      Polymers 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
       Degree of crystallinity
       Degree of crystallinity
          Pattern consists of relatively sharp crystalline peaks +
          Pattern consists of relatively sharp crystalline peaks +
             amorphous scattering
             amorphous scattering
          Comparing intensities of the two ––> % crystallinity
          Comparing intensities of the two ––> % crystallinity
                              
      Polymers 
      Polymers 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
       Degree of crystallinity
       Degree of crystallinity
          Pattern consists of relatively sharp crystalline peaks +
          Pattern consists of relatively sharp crystalline peaks +
             amorphous scattering
             amorphous scattering
          Comparing intensities of the two ––> % crystallinity
          Comparing intensities of the two ––> % crystallinity
          Problems:
          Problems:
             small crystallite size broadens peaks
             small crystallite size broadens peaks
             extensive amounts of crystal imperfections
             extensive amounts of crystal imperfections
             thermal motion
             thermal motion
                              
      Polymers 
      Polymers 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
       Degree of crystallinity
       Degree of crystallinity
          Pattern consists of relatively sharp crystalline peaks +
          Pattern consists of relatively sharp crystalline peaks +
             amorphous scattering
             amorphous scattering
          Comparing intensities of the two ––> % crystallinity
          Comparing intensities of the two ––> % crystallinity
       Methods for separation:
       Methods for separation:
             guess
             guess
             measure 100% amorphous specimen
             measure 100% amorphous specimen
                              
      Polymers 
      Polymers 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
      (see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000)) 
       Total scattering by amorphous & crystalline phases
       Total scattering by amorphous & crystalline phases
       Q is called the invariant           s = diffraction vector
       Q is called the invariant           s = diffraction vector