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Watching RAFT PISA grow spheres, worms, vesicles
In situ SAXS shows PGMA45-PHPMA200 aqueous RAFT PISA nucleating in 9–10 min and finishing as ~227 nm vesicles.
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When does micellar nucleation occur by SAXS?
Within 9–10 minutes.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
At what PHPMA DP do short worms appear?
Around 134.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What final vesicle diameter does SAXS give?
227 ± 16 nm.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What HPMA conversion is reached?
More than 99% within 80 min at 70 °C.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What GPC Mn and dispersity were measured postmortem?
Mn = 51 200 g mol−1, Mw/Mn = 1.25.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What morphological path is already known for this PISA?
Spheres to worms to vesicles.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
How large is the SAXS reaction volume?
Around 2.0 mL, enough for postmortem NMR, DLS, TEM, GPC.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What diblock was targeted?
PGMA45-PHPMA200 vesicles at 10% w/w solids.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
What SAXS feature marks the sphere-to-worm transition?
An I(q) upturn after 28–29 min.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
Which intermediates did prior TEM show before vesicles?
Octopus-like and jellyfish-type structures from branched worms.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified
At what temperature is the aqueous RAFT dispersion run?
70 °C.
Source: <i>In situ</i> SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly · DOI · quote verified