Documents

3.0-Polymer MW and Size.ppt

Description
Description:
Categories
Published
of 46
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  Chapter 2. Molecular Weight and Polymer Solutions POLYMER HEMISTRY 2.1 Number average and weight average molecular weight2.2 Polymer solutions2.3 Measurement of number average molecular weight2.4 Measurement of weight average molecular weight2.5 Viscometry2.6 Molecular weight distribution  2.1 Number Average and Weight Average Molecular Weight A. The molecular weight of polymers a. Some natural polymer (monodisperse) : All polymer molecules have same molecular weights. b. Synthetic polymers (polydisperse) : The molecular weights of polymers are distributedc. Mechanical properties are influenced by molecular weightmuch lower molecular weight ; poor mechanical property much higher molecular weight ; too tough to process optimum molecular weight ; 105 -106 for vinyl polymer 15,000 -20,000 for polar functional group containing polymer(polyamide) POLYMER HEMISTRY  Acclaim 與 ArcolPPG    B. Determination of molecular weight a.Absolute method : mass spectrometrycolligative propertyend group analysislight scatteringultracentrifugation. b. Relative method : solution viscosity c. Fractionation method : GPC POLYMER HEMISTRY
Search
Tags
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks
SAVE OUR EARTH

We need your sign to support Project to invent "SMART AND CONTROLLABLE REFLECTIVE BALLOONS" to cover the Sun and Save Our Earth.

More details...

Sign Now!

We are very appreciated for your Prompt Action!

x