Structural Peculiarities of Triblock Copolymers Containing Poly(Ethylene Oxide) and Polyacrylamide

Materialwissenschaft Werkst

Aleinichenko

et al. 2011

Self Cite

Using differential scanning calorimetry, the structure of the diblock copolymer (DBC)MePEO-bPAAm was determined. The behaviour of DBCs in water and mixed solvents was investigated. It is shown that adding of dimethyl formamide to DBC water solutions leads to destruction of the H-bonds network between the PAAm and MePEO blocks. The tendency of DBCs to micellization in water/ethanol mixture depends on the length of MePEO block and grows with increasing molecular weight of MePEO and PAAm.Keywords: block copolymer / intramolecular polycomplex / micellization / Mittels Dynamischer Differenzkalorimetrie wurde die Struktur des Diblock-Copolymers (DBC) Polyacrylamid/Monomethoxy-Poly(Ethylen) Oxid (MePEO-b-PAAm) untersucht. Ebenso wurde das Verhalten der Diblock-Copolymerein wässrigen Lösungen und in gemischten Lösungsmitteln untersucht. Es wurde gezeigt, dass die Zugabe von Dimethylformamid zu einer wässrigen Lösung der DBCs die Wasserstoffbrückenbindungen zwischen den MePEO-und PAAm-Blöcken zerstört. Es wird angenommen, dass die Neigung der DBCs zur Mizellbildung in einer wässrig-ethanolischen Lösung von der Blocklänge des MePEOs abhängt und darüber hinaus mit dem Anstieg der molaren Masse der einzelnen Blöcke zunimmt.

Section: Resultssupporting

confidence: 74%

“…The block copolymers (DBC) MePEO-b-PAAm were prepared by radical block copolymerization of AAm using MePEO as macroinitiator, according to the method described earlier [10]. The diammonium hexanitrocearat produced by "Fluka" (Germany) has been used as initiator of the radical process.…”

Section: Experimental Partmentioning

confidence: 99%

Diblock copolymers containing polyacrylamide and monomethoxy‐poly(ethylene) oxide: bulk structure and micellization

Kunitskaya¹,

Materialwissenschaft Werkst

Aleinichenko

et al. 2011

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“…1, they could be attributed (as in the study [19]) to the presence of two systems of planes of the paracrystalline lattice in the amorphous regions of PAAm-b-PEO-b-PAAm and MOPEOb-PAAm structures, which contain mainly PАAm chains. The first maximum with smaller intensity at θ ∼ 15 • characterizes the lateral periodicity in an arrangement of PАAm chains but the second one with greater intensity at θ ∼ 21 • reflects the periodic arrangement of the flat hydrogen-bonded cis-dimers of amide groups in the structures of cis-trans-multimers [12].…”

Section: Resultsmentioning

confidence: 93%

“…The appearance of these peaks indicated the formation of crystalline Ag nanoparticles with tetragonal facet-centered cubic lattice [10]. An amorphous character of polymeric phases in the compositions was completely correlated with the data of WAXS studies [19,20], which demonstrated the loss of PEO crystalline properties in the block copolymer structure because of the interaction of the main and grafted chains i.e. IntraPС formation and existence of a glass transition in the structure of TBС.…”

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Morphology of Silver Nanoparticles in the Micelle-Forming Block Copolymers

Fedorchuk

Molecular Crystals and Liquid Crystals

Gomza

et al. 2014

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Block copolymers: MOPEO-b-PААm and PААm-b-PЕО-b-PААm contained poly(ethylene oxide), its monomethyl ether and chemically complementary polyacrylamide were and used as special matrices in the borohydride reduction of Ag + ions.Ag-nanoparticles in the structure of compositions were obtained. The effect of chemical nature, molecular architecture and size stabilization of silver nanoparticles in bulk structure was shown.

Micellization and Structure of MOPEO‐b‐PCL Copolymers and Their Application as Nanocontainers for Drugs

Partsevskaya

Macromolecular Symposia

Gomza

et al. 2012

Summary: Diblock copolymers (DBCs) of MOPEO-b-PCL containing biocompatible and biodegradable components: hydrophilic methoxypoly-(ethylene oxide) (M n ¼ 2.5 kDa ¼ const) and hydrophobic poly(e-caprolactone) of a variable chain length (M n ¼ 2.8 Ä 24.3 kDa) were synthesized by an anionic ring-opening block copolymerization. Their chemical and microphase structure were characterized using FTIR, NMR, DSC and WAXS. Self-assembly of pure DBCs and those at the presence of a model drug prednisolon (PS) in dioxane/aqueous solutions was studied using visible spectroscopy and static light scattering. Increasing in the micellar stability at the PCL block lengthening and PS addition was revealed. The drug binding by DBC micelles due to hydrogen bonds and hydrophobic interactions was confirmed by FTIR.