Definition of Molecular Weight
The molecular weight and molecular weight distribution of polymers are fundamental data for studying the properties of polymers and polymer materials. These parameters are closely related to the mechanical properties of polymer materials and their products, the rheological behavior of polymers, and the selection of processing conditions for polymer processing. They are also essential data for researching specific polymerization reactions and the structure of specific polymers in the fields of polymer chemistry and polymer physics.
Testing Method: GPC (Gel Permeation Chromatography) ,MS
Instrument Technical Parameters for Molecular Weight Testing
- Mobile Phases: THF (tetrahydrofuran), aqueous phase (H₂O), DMF (N,N-dimethylformamide), dichloromethane, TCB (trichlorobenzene)
- Molecular Weight Range: 1,000 to 600,000 (Significant errors may occur if the sample's molecular weight is too low or too high.)
- Limitations of Aqueous Phase GPC: Unable to test polysaccharides, proteins, natural polymers (such as cellulose), and polymers with extremely high molecular weights (such as polyacrylamide, etc.).
- Temperature Accuracy: ± 0.01℃
Sample Submission Requirements and Precautions
- 5–30 mg of solid or liquid samples. Samples must be free of solvents.
- Samples must be soluble in the mobile phase.
Testing Examples
Reference Standards
- ISO 13885-1:2020: Gel Permeation Chromatography (GPC) - Part 1: Tetrahydrofuran (THF) as Eluent
- ISO 11344:2016: Synthetic Raw Rubber - Determination of Molecular Mass Distribution of Solution Polymers by Gel Permeation Chromatography
- GB/T 21863-2008: Gel Permeation Chromatography (GPC) - Using Tetrahydrofuran as Eluent
- GB/T 27843-2011: Chemicals - Determination of Low Molecular Weight Components in Polymers - Gel Permeation Chromatography (GPC)
- GB/T 30787-2014: The standard name corresponding to this standard number is currently unclear, possibly a niche or specific field standard that has not been widely published.
- NY/T 1860.35-2016: Guidelines for Testing Physicochemical Properties of Pesticides - Part 35: Determination of Polymer Molecular Weight and Molecular Weight Distribution (Gel Permeation Chromatography)
