Stabilization of emulsion polymerization by block and graft copolymers with polysiloxane and poly[(acetylimino)ethylene] sequences

Simionescu, C. I.; David, Geta; Alupei, Valentina; Rusa, Mariana; Ioanid, Aurelia; Simionescu, Bogdan C.

doi:10.1002/(sici)1522-9505(19980301)255:1<17::aid-apmc17>3.3.co;2-0

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Although the copolymer surfactant was not characterized in detail, the authors could confirm that the number of latex particles, N p , as a function of the copolymer concentration varies such as N p $ [Cop] b , with b being in the range of 1.6 to 2.1, which they attribute to a nucleation process throughout the polymerization. An interesting class of polysiloxane-poly[(acetylimino) ethylene] block copolymers as nonionic surfactants were developed by Simionescu et al [125] These copolymers of the following structure:…”

Section: Pmma-peo and Miscellaneous Nonionicmentioning

confidence: 99%

Block Copolymers in Emulsion and Dispersion Polymerization

Riess

Labbe

2004

Macromol. Rapid Commun.

163

171

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Summary: This article deals with recent progress including the authors' work concerning the application of block copolymers as polymeric surfactants in heterophase polymerizations. The synthesis methods for preparing block copolymers by emulsion and dispersion techniques are outlined, with emphasis on recently developed controlled free radical polymerizations in aqueous media. Specific characteristics of amphiphilic block copolymers are described, for example, micellization and emulsifying effects. A general overview of emulsion and dispersion polymerization in an aqueous and organic medium with ionic and nonionic block copolymers is presented for the preparation of electrosteric and sterically stabilized latex particles. Typical examples of microemulsion, miniemulsion, oil‐in‐oil emulsion, and micellar polymerizations are provided. Current and potential developments of so‐called “hairy latexes”, inverse‐, multiple‐, and solid emulsions, as well as of nonaqueous polymeric dispersions are also discussed.PS foam obtained by free radical polymerization of water‐in‐styrene, stabilized with a PS–PEO diblock copolymer.imagePS foam obtained by free radical polymerization of water‐in‐styrene, stabilized with a PS–PEO diblock copolymer.

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Section: Pmma-peo and Miscellaneous Nonionicmentioning

confidence: 99%

Block Copolymers in Emulsion and Dispersion Polymerization

Riess

Labbe

2004

Macromol. Rapid Commun.

163

171

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“…[ 11 , 12 , 13 , 14 , 15 , 16 , 17 ]; (b) introduction of organic functions on silicon by various mechanisms (hydrosilylation, condensation, dehydrocoupling, thiol-ene addition, etc. ), study of their effects on the properties of the resulting compounds and evaluation of their functionality as blocks for siloxane-organic copolymerization [ 15 , 18 , 19 , 20 , 21 ]; (c) obtaining of block [ 22 , 23 ] or segmented [ 24 , 25 , 26 , 27 ] siloxane-organic copolymers with different internal functions (silyl ether, silyl ester, urethane, imide, amide, imine, etc.) showing different properties (self-assembling ability, liquid crystals, redox or surface activity, pH sensitivity, controlled hydrolytic degradability, etc.)…”

Section: Context and Early Romanian Achievements In The Field Of Siliconesmentioning

confidence: 99%

From Amorphous Silicones to Si-Containing Highly Ordered Polymers: Some Romanian Contributions in the Field

Cazacu¹,

Racleş²,

Zaltariov³

et al. 2021

Polymers

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Polydimethylsiloxane (PDMS), in spite of its well-defined helical structure, is an amorphous fluid even at extremely high molecular weights. The cause of this behavior is the high flexibility of the siloxane backbone and the lack of intermolecular interactions attributed to the presence of methyl groups. These make PDMS incompatible with almost any organic or inorganic component leading to phase separation in siloxane-siloxane copolymers containing blocks with polar organic groups and in siloxane-organic copolymers, where dimethylsiloxane segments co-exist with organic ones. Self-assembly at the micro- or nanometric scale is common in certain mixed structures, including micelles, vesicles, et cetera, manifesting reversibly in response to an external stimulus. Polymers with a very high degree of ordering in the form of high-quality crystals were obtained when siloxane/silane segments co-exist with coordinated metal blocks in the polymer chain. While in the case of coordination of secondary building units (SBUs) with siloxane ligands 1D chains are formed; when coordination is achieved in the presence of a mixture of ligands, siloxane and organic, 2D structures are formed in most cases. The Romanian research group’s results regarding these aspects are reviewed: from the synthesis of classic, amorphous silicone products, to their adaptation for use in emerging fields and to new self-assembled or highly ordered structures with properties that create perspectives for the use of silicones in hitherto unexpected areas.

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“…These polymers containing hydrophobic siloxane chains and quaternary bipyridinium hydrophilic functionalities were found to increase transdermal penetration of lipophilic bioactive compounds. Previously, we described the preparation of different chain or end functional PDMSs containing hydroxypropyl, aminopropyl, carboxyester, carboxyamide [13], chloromethylphenethyl [14], pyrrolyl [15], or mesogene functionalities [16], and their use in the synthesis of organic-inorganic block and graft copolymers [15,[17][18][19]. This paper deals with the preparation and physico-chemical characteristics of new bipyridinium salt-tetramethyldisiloxane alternating copolymers and of their CDbased polyrotaxanes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polyrotaxanes based on Cyclodextrins and Viologen-modified Polydimethylsiloxanes

Marangoci¹,

Fifere²,

Farcas³

et al. 2007

High Performance Polymers

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β-Cyclodextrin ( 1 -CD) and 2 -cyclodextrin ( 2 -CD) (hosts) formed inclusion complexes with 4,41-bipyridinium dication derivatives with long chains (guests), in which the substituents on the bipyridinium nitrogen atoms are 1,3-bis(chloromethylphenethyl)-1,1,3,3-tetramethyldisiloxane. The number of 2 -CD molecules threaded onto the polymer chain increases with the length of the guest chain. In contrast, the number of β-CD molecules threaded onto the polymer is approximately 4 corresponding to each molecular chain, due to the repulsive interaction between β-CD and the quaternary bipyridinium units. The complexes were isolated in high yield and characterized by 1H NMR, 13C NMR, X-ray diffraction, thermal and scanning electron micrographs studies. As proven by X-ray analysis, the synthesized polyrotaxanes are crystalline materials with crystalline patterns significantly different from that of native cyclic oligosaccharide. The thermal stabilities of polyrotaxanes are higher than that of the physical mixture between cyclodextrin and the alternating copolymer, denoting the formation of the inclusion complexes. Scanning electron micrographs of polyrotaxanes reveal cubic and linear shapes without a well formed shape. Shape regularity and geometrical regularities in the agglomerating forms can be observed.

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Stabilization of emulsion polymerization by block and graft copolymers with polysiloxane and poly[(acetylimino)ethylene] sequences

Cited by 3 publications

References 11 publications

Block Copolymers in Emulsion and Dispersion Polymerization

Block Copolymers in Emulsion and Dispersion Polymerization

From Amorphous Silicones to Si-Containing Highly Ordered Polymers: Some Romanian Contributions in the Field

Synthesis and Characterization of Polyrotaxanes based on Cyclodextrins and Viologen-modified Polydimethylsiloxanes

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