Knot formation in a single polymer chain was studied by measuring chain expansion processes from a globule to a coil state. Dilute solutions of poly(methyl methacrylate) in the mixed solvent tert-butyl alcohol + water(2.5 vol %) were preserved in a globule state at 25.0°C for a time period t p and given a fast temperature jump to the 6 temperature 41.5°C to measure the chain expansion process by static light scattering. The chain expansion occurred slower with increasing tp for the molecular weight Mw = 1.22 × 107. For the constant time period tp = 7200 min, the expansion process became slower with increasing Mw from 4 × 106 to 1.5 × 107. These observations disclose the knot formation in a single polymer chain.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry