The translational diffusion coefficient D of labeled poly(propylene oxide) chains in molten poly(propylene oxide) has been measured by fluorescence redistribution after pattern photobleaching both below and above the critical molecular weight for entanglement. Labeled poly(propylene oxide) was synthesized with exactly one fluorophore per molecule. The dependence of D on solvent molecular weight in the entangled system is evidence that tube renewal is an important mechanism for self-diffusion in this moderate-molecular-weight polymer melt.
No takes yet. Share an insight, caveat, or question.
Smith et al. (1984) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: