Characterization of aqueous micellar solutions of amphiphilic block copolymers of poly(acrylic acid) and polystyrene prepared via ATRP. Toward the control of the number of particles in emulsion polymerization

Thermosensitive behavior of amphiphilic triblock copolymers based on poly(acrylic acid) and poly(propylene oxide)

“…They observed a decrease of the aggregation number from 59 for a diblock copolymer (PS 10 -PAA 100 ) to 18 for a triblock copolymer (PAA 52 -PS 9 -PAA 52 ) and to 9 for the PAA 76 -PS 9 -PAA 76 . 25 This seems to corroborate our results. The poorly associative behavior is probably due to the triblock copolymer structure limiting their association.…”

Recent Research Progress in the Synthesis and Properties of Amphiphilic Block Co-polymers and Their Applications in Emulsion Polymerization

“…Subsequent hydrolysis of the ester groups was performed as follows. The block co-polymers were dissolved in dichloromethane and a fivefold molar excess (with respect to the ester groups) of trifluoroacetic acid was added [19]. In the end, amphiphilic block co-polymers bearing polystyrene and poly(acrylic acid) segments were obtained (Fig.…”

“…In order to obtain block co-polymers having a constant poly(nbutyl acrylate (PnBA) block length for different lengths of the poly(acrylic acid) (PAA) blocks, n-butyl acrylate (nBA) was polymerized first to yield a PnBA 90 -Br Figure 1. Structure of the amphiphilic co-polymers of polystyrene and poly(acrylic acid) [19]. macroinitiator, followed by initiating the polymerization of tert-butyl acrylate (tBA) and selective acidolysis of the PtBA block.…”

“…The major differences between PS-b-PVBTEAC and the analogous poly(styrene)-b-poly(potassium acrylate)(PSb-PAK) anionic di-block co-polymer [10,19] were as follows: the ratio between the initial number of micelles (N m ) and the N p was particularly high (135-270), which indicated the high mobility of the co-polymer chains; the polystyrene particles produced by emulsion polymerization using the anionic P(S) 10 -b-P(AK) 56 displayed a higher N p than the cationic latex stabilized by the P(S) 12 -b-P(VBTEAC) 62 copolymer; a strong influence of the ionic strength on the stabilization of the latex was observed during the nucleation period, but the final latex was not sensitive to salt; the trend of the bi-logarithmic plot of the number of particles versus the stabilizer concentration was not linear in the range of 0.5-4 wt% of P(S) 12 -b-P(VBTEAC) 62 co-polymer.…”

Synthesis of Amphiphilic Polystyrene-b-Poly(acrylic acid) Diblock Copolymers by Iodide-Mediated Radical Polymerization

“…Recent progress in controlled radical polymerization, especially nitroxide-mediated radical polymerization (NMRP), 10 atom transfer radical polymerization (ATRP), 11,12 and reversible addition-fragmentation chain transfer polymerization (RAFT), 13 opens a new channel to prepare welldefined block copolymers at much mild reaction conditions. Block copolymers containing PMAA or PAA segments have been successfully synthesized using ATRP, [14][15][16][17][18][19][20][21][22] RAFT, 23,24 and NMRP 25,26 techniques. The so-called iniferter-based living radical polymerization was also employed for the synthesis of block copolymers containing PMAA segment.…”