Copolymerization of a dendronized monomer with styrene and different acrylates: Determination of reactivity ratios

Krebs, Anke; Bruchmann, Bernd; Müller-Cristadoro, Anna; Al-Hellani, Rabie; Schlüter, A. Dieter

doi:10.1002/pola.26504

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…A similar trend of the reactivity ratio was observed for the copolymerization of tert-butyl methacrylate with the bulky rst-generation dendronized monomer carrying an ethylene glycol-based dendron. 30…”

Section: Raft Polymerization Of Maecamentioning

confidence: 99%

Synthesis via RAFT polymerization of thermo- and pH-responsive random copolymers containing cholic acid moieties and their self-assembly in water

Pal

Roy

2014

Polym. Chem.

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Here we report the design and synthesis of polymers containing cholic acid pendant groups, a major bile acid synthesized in the liver from cholesterol. Random copolymers derived from 2-(methacryloyloxy)ethyl cholate (MAECA) with polyethylene glycol methyl ether methacrylate (PEGMA) and N,Ndimethylaminoethyl methacrylate (DMAEMA) have been synthesized by reversible additionfragmentation chain transfer (RAFT) polymerization. Compositions of co-monomers in the copolymers were determined by 1 H NMR spectroscopy, which were further used to determine reactivity ratios of the monomers using the extended Kelen-Tüdös method at high conversions. Copolymers from MAECA with PEGMA (P(MAECA-co-PEGMA)) series displayed lower critical solution temperatures (LCSTs) up to 23% MAECA content in the copolymer, which was studied by UV-visible spectroscopy. Both thermo-and pHresponsiveness were observed for the P(MAECA-co-DMAEMA) copolymers with an MAECA unit in the copolymer up to 11.8%. The critical aggregation concentration (CAC) of water soluble copolymers was determined by fluorescence spectroscopy. Self-assembly of random copolymers was investigated by 1 H NMR spectroscopy, dynamic light scattering (DLS), atomic force microscopy (AFM) and scanning electron microscopy (SEM), which indicated micellar structures in water from cholic acid based random copolymers. The polymeric aggregates were further explored for their drug encapsulation capabilities in aqueous medium using nile red as a hydrophobic model compound.

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Section: Raft Polymerization Of Maecamentioning

confidence: 99%

Synthesis via RAFT polymerization of thermo- and pH-responsive random copolymers containing cholic acid moieties and their self-assembly in water

Pal

Roy

2014

Polym. Chem.

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“…Mainly, reactivity ratios of the g [1]type dendron and co-monomer pairs were determined with an exception of g [2]-type ethylene glycol-based type dendron and styrene pair. [8] Dendron used in this study, ACTES (di-tert-butyl 4-acryloylamino-4-(2-tert-butoxycarbonylethyl) heptanedioate), is a polymerizable first generation, g [1], dendron derived from Newkome-type dendron bearing easily cleavable tertiary butoxy groups as end groups. These cleavable end groups were used to modify chitosan in order to impart water solubility after the hydrolysis of tertiary butoxide groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of linear dendritic homo and copolymers acrylated behera amine

Esen

2015

Designed Monomers and Polymers

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A co-polymerizable dendron of first generation synthesized from behera amine was homopolymerized and copolymerized with commercial monomers such as styrene, methyl methacrylate, and N-vinyl pyrrolidone. Characterization of the co-polymers was performed and it was found with the help of FT-IR and proton and carbon NMR that copolymerizable dendron, ACTES (ACrylated TriESter, first-generation dendron of acrylated behera amine) was incorporated in the co-polymer chains. Besides, the reactivity ratio pairs of the ACTES monomer with both styrene and n-vinyl pyrrolidone were determined. The reactivity ratio pair for ACTES and MMA could not be determined by neither gravimetrically nor with NMR. After experiments and calculations, the reactivity ratio pair for styrene and ACTES was found to be r st = 0.27 and r ac = 0.44 and for NVP and ACTES r nvp = 0.36 and r ac = 1.01. By utilization of the reactivity ratio of ACTES, "Q" and "e" values were determined in order to be able to draw some conclusions about the reactivity behavior during copolymerizations. "Q" = 1.152 and "e" = 0.66 were found with respect to styrene as reference. These values indicates the steric effect of ACTES was more dominant in copolymerizations.

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“…We here report the syntheses of monomers MG1 , MG1.5 , MG2 , and MG3 , which are either modified to known procedures under efficiency aspects ( MG1 , MG1.5 ) or new ( MG2 and MG3 ). These monomers were converted into their homopolymers through free radical polymerization and also used to create the random copolymers PG1 co 2, PG1 co 3 , and PG2 co 3 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Neutral, Water-Soluble Oligo–Ethylene Glycol-Containing Dendronized Homo- and Copolymers of Generations 1, 1.5, 2, and 3

et al. 2014

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Oligo-ethylene glycol-containing dendronized monomers MG1, MG1.5, MG2, and MG3 were synthesized in a particularly easy fashion on the gram scale involving only few steps. Their corresponding homopolymers (PG1, PG1.5, PG2, and PG3) and copolymers (PG1co2, PG1co3, and PG2co3) were synthesized via free radical polymerization. All the polymers are soluble in water and also in organic solvents such as DCM, CHCl 3 , 1,4-dioxolane, DMF, and DMSO. Their glass transition temperatures (T g ) are in the range −68°C < T g < −48°C and thus rather low. All polymers show thermoresponsive behavior which was investigated by turbidity measurements. Interestingly, a 1:1 mixture of homopolymers PG1 and PG2 behaves identical with PG1 alone, while the collapse curve of copolymer PG1co2 is almost superimposable with that of PG2 alone. Thus, in the former case PG1 dominates the thermoresponsive behavior while in the latter this is done by the G2-dendrons in the copolymer. Finally, the polymer chains were visualized by AFM, confirming the rod-like behavior of these rigidified polymers.

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Copolymerization of a dendronized monomer with styrene and different acrylates: Determination of reactivity ratios

Cited by 7 publications

References 41 publications

Synthesis via RAFT polymerization of thermo- and pH-responsive random copolymers containing cholic acid moieties and their self-assembly in water

Synthesis via RAFT polymerization of thermo- and pH-responsive random copolymers containing cholic acid moieties and their self-assembly in water

Synthesis and characterization of linear dendritic homo and copolymers acrylated behera amine

Synthesis of Neutral, Water-Soluble Oligo–Ethylene Glycol-Containing Dendronized Homo- and Copolymers of Generations 1, 1.5, 2, and 3

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