Amphiphilic Gradient Copolymers: Synthesis and Self&amp;;#x02010;Assembly in AQUEOUS SOLUTION

Deniau‐Lejeune, Elise; Borisova, O. V.; Štěpánek, Petr; Billon, Laurent; Borisov, Oleg V.

doi:10.1002/9781118887813.ch3

Cited by 1 publication

(1 citation statement)

References 164 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existing synthesis methods for gradient copolymers have been developed based on the criterion that the instantaneous composition, F inst , which reflects the drift in the monomer concentration in the copolymer, or the cumulative composition, F cum , which is the composition of the copolymer at time t , vary continuously as a function of the apparent normalized chain length . Cumulative and instantaneous compositions are calculated from eqs and , respectively …”

Section: Resultsmentioning

confidence: 99%

Interplay of Thermosensitivity and pH Sensitivity of Amphiphilic Block–Gradient Copolymers of Dimethylaminoethyl Acrylate and Styrene

et al. 2018

Self Cite

View full text Add to dashboard Cite

Novel pH- and thermoresponsive amphiphilic diblock copolymer, comprising hydrophilic poly(2-dimethylaminoethyl acrylate) (PDMAEA) and amphiphilic poly(styrene-grad-2-dimethylaminoethyl acrylate) (P(S-grad-DMAEA)) blocks, was synthesized by nitroxide-mediated radical polymerization. A series of copolymers (PS-grad-PDMAEA) with controlled molar masses and low dispersities over a wide range of monomer feed ratios (0 < f S,0 < 1) were synthesized. Both conventional linearization and nonlinear least-squares methods were applied to estimate reliable values of the reactivity ratios for S and DMAEA radical polymerization. The calculated values of the reactivity ratios (r DMAEA = 0.25 and r S = 1.15) perfectly fitted the drift in monomer feed ratio versus conversion, showing a gradient distribution along the copolymer chains. The self-assembling behavior of the copolymers in the aqueous medium was investigated by dynamic light scattering and small-angle neutron scattering over a wide range of pH, temperature, and salt concentration. These block-gradient copolymers show reversible self-association into micelle-like structure (D h ∼ 20 nm) in aqueous solutions triggered by both pH and temperature.

show abstract

Section: Resultsmentioning

confidence: 99%