Poly(Methyl Methacrylate) (PMMA) is a synthetic organic polymer made from the polymerization of Methyl Methacrylate monomers. PMMA is commonly known as Acrylic or Plexiglas. Through a simple polymerization process, it can be formed into sheets, blocks or pellets. PMMA is a relatively inexpensive material. It is also clear, light and tough which make it an ideal substitute for certain glass applications. Typically, PMMA is found in bank teller partitions, windows, ice hockey rinks and aquariums. Solution Viscosity is a key property control in the manufacturing process. The purpose of this App Note is to demonstrate the repeatability of the HMJ DSV technique. The samples were analyzed using an HMJ Y501 Dual Capillary Relative Viscometer system. The analysis conditions are listed below.

Solvent	THF
Sample Concentration	0.5 g/dL
Prep Temperature	25C
Dissolution Time	60 Minutes
Analysis Temperature	30C

RSD of DSV data is typically less than 1% and the following data supports that claim. 

Samples	IV (dL/g)		Sample	IV (dL/g)
Virgin 1A	4.0641		Processed 1A	3.4034
Virgin 1B	4.0540		Processed 1B	3.4062
Virgin 2A	4.0155		Processed 2A	3.4099
Virgin 2B	4.0062		Processed 2B	3.4066
Average	4.0350		Average	3.4065
SD	0.0284		SD	0.0027

Average = 0.3458 SD = 0.0018 RSD = 0.52%

In addition to the precision of the data demonstrated above, the relative viscometer presents an easy opportunity to automate a particularly laborious task. Automation can range from a simple autosampler system to fully automated Vortex operation.