On-line properties analysis of a molten polymer by raman spectroscopy for control of a mixing device

A process for controlling a mixing device comprising:

• (a) feeding a polymeric material to the mixing device;
• (b) irradiating at least a portion of the polymeric material within the mixing device;
• (c) measuring the energy shift experienced by the polymeric material due to the step of irradiating;
• (d) determining a characteristic of the polymeric material based on the energy shift;
• and
• (e) adjusting operation of the mixing device based on the characteristic of the polymeric material;
• wherein steps (b), (c), and (d) are conducted using at least one analysis probe and Raman spectroscopy, and wherein the polymeric material is in a homogeneous state, and the at least one analysis probe has a focus point of about 500 μm to about 650 μm.

A process for controlling a polymerization process comprising:

• (a) feeding a polymeric material to a mixing device;
• (b) irradiating at least a portion of the polymeric material within the mixing device;
• (c) measuring the energy shift experienced by the polymeric material due to the step of irradiating;
• (d) determining a characteristic of the polymeric material based on the energy shift;
• and
• (e) adjusting operation of the polymerization process based on the characteristic of the polymeric material;
• wherein steps (b), (c), and (d) are conducted using at least one analysis probe and Raman spectroscopy, and wherein the polymeric material is in a homogeneous state, and the at least one analysis probe has a focus point of about 500 μm to about 650 μm.

A process for controlling a polymerization process comprising:

• (a) feeding a polymeric material to a mixing device;
• (b) irradiating at least a portion of the polymeric material within the mixing device;
• (c) measuring the energy shift experienced by the polymeric material due to the step of irradiating;
• (d) determining a characteristic of the polymeric material based on the energy shift;
• and
• (e) adjusting operation of the polymerization process based on the characteristic of the polymeric material;
• wherein steps (b), (c), and (d) are conducted using at least one analysis probe and Raman spectroscopy, and wherein said polymeric material is in a non-homogeneous state and said analysis probe has a focus point of about 50 μm to about 200 μm.