Heating and Annealing Temp/Times of PMMA and Polypropylene and

[PhysicsFlump]

The supervisor of my final year physics project has asked me to find the heating and annealing temp/times for PMMA (perspex) and Polypropylene. I've spent a good hour or so looking for them, but I'm not quite sure where to look. I'll be using the PMMA to make a variable-focus lens, and to form the lens i'll be moulding the PMMA between two glass lenses and popping in the oven. I'll be using the Polypropylene as a test run.

Does anyone have any ideas of what the ideal temperatures and times would be, or websites/journals etc that I could find the information?

 

[Navin A S]

For PMMA, the ideal annealing temperature is between 120-160°C (248-320°F). This should be held for 1-2 hours. For polypropylene, the annealing temperature is around 180°C (356°F) and should be held for 1-2 minutes. As an example, you could use a time of 2 minutes at 180°C for polypropylene. It's important to note that the exact heating and annealing times will depend on the thickness and type of material being used, so it's always best to consult with the manufacturer of the material to ensure optimal results.