High MW polymers

[pss-usa]

One idea would be to use a broad molecular eight standard and use a broad standard calibration curve. Using a Broad standard or Integral calibration method will allow you to push the calibration curve to a higher limit. Most GPC software packages support his type of calibration method. The key will be finding a sufficiently high enough molecular weight broad PEO standard for this type of calibration. Also, extrapolation error is a big worry, as mentioned above. Using a broad standard and or integral calibration might help.

[Jaries]

The main reason we have stuck with the narrow range low molecular standards for calibration curve is because we cant seem to find high molecular range PEO standard. This highest I have is around 1M MW
Any one have any ideas or knows where I could get some high MW standards? Thanks.