Synthesis of miktoarm star (?-star) polymers

Hadjichristidis, Nikos

doi:10.1002/(sici)1099-0518(19990401)37:7<857::aid-pola1>3.0.co;2-p

Cited by 424 publications

(401 citation statements)

References 91 publications

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“…Block copolymers show microphase-separated morphologies on this length scale and thus are an important class of materials. Investigations have been carried out on the morphologies, both for linear systems like AB block copolymers [4], ABC triblock terpolymers [5,6], or ABCD tetrablock quaterpolymers [7], as well as on other systems with non-linear topologies like AB miktoarm copolymers [8], or ABC miktoarm star terpolymers [9]. Also blending of linear block copolymers as another strategy to control morphology was used successfully [10,11].…”

Section: Introductionmentioning

confidence: 99%

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Abetz

Jiang

2004

E-Polymers

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In this contribution we report on the morphological structures formed in blends of microphase-separated 3-miktoarm star terpolymers of polystyrene-armpolybutadiene-arm-poly(2-vinylpyridine) (SBV*) and polystyrene-block-polybutadiene (SB), polystyrene-block-poly(2-vinylpyridine) (SV), poly(2-vinylpyridine)-block-poly(cyclohexyl methacrylate) (VC) diblock copolymers. The morphologies are characterized by transmission electron microscopy. Blends with similar morphologies as known from linear triblock terpolymers are found, like core-shell structures based on cylinders or gyroids. Other blends show very distorted morphologies, or morphologies similar to the ones found for pure 3-miktoarm star terpolymers. While attractive interactions between blocks of the two species enhance the formation of common superlattices, blends with too large diblock copolymers tend to macrophase-separate.

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Section: Introductionmentioning

confidence: 99%

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Abetz

Jiang

2004

E-Polymers

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“…26,[29][30][31][32][33] This linking strategy is likely to remain another timeless example of a synthesist's art over both glass and chemistry.…”

Section: Linking Manipulations Using Chlorosilanes: Hellenic Techniqumentioning

confidence: 99%

Experimental techniques in high‐vacuum anionic polymerization

Uhrig

Mays

2005

J. Polym. Sci. A Polym. Chem.

282

268

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Experimental methods used in high‐vacuum anionic polymerization are described in detail, with extensive illustrations to demonstrate proper procedures and techniques. These descriptions include construction and operation of the vacuum line, handling purification chemicals, ampulization techniques, short‐path distillations, initiator synthesis, polymerization procedures, and linking reactions using chlorosilanes. A primary emphasis is placed on safety. We believe that this review of these methods will be useful to scientists working in the field of anionic polymerization and may also benefit other researchers in performing tasks requiring ultra‐high‐purity reaction conditions. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 6179–6222, 2005

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“…7 Furthermore, star polymers with spherical shapes and dense structures are expected to provide unique properties and functions compared with their linear counterparts. 8,9 For the synthesis of heteroarm star polymers, especially with many arm chains, a sequential arm extension method has typically been utilized (Scheme 1a). Sequential living polymerization from living growing sites in the core of a star polymer with homoarm chains, prepared via a polymer-linking reaction, efficiently yields a heteroarm star polymer.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient synthesis of heteroarm star-shaped polymers using polymer-linking reaction and their characteristic stimuli-responsive behaviors

Oda

Shibata

Tsujimoto

et al. 2012

Polym J

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Heteroarm star-shaped polymers containing independent stimuli-responsive moieties were synthesized by a one-pot arm-linking reaction based on base-assisting living cationic polymerization. Mixing two or more kinds of living polymers followed by the linking reaction with a divinyl compound successfully produced a heteroarm star-shaped polymer containing a number of arm chains with a narrow molecular weight distribution (M w /M n ¼ 1.14-1.48) and high yield. For example, four kinds of linear poly(vinyl ether)s containing oxyethylene and alicyclic pendants were linked quantitatively to give a star polymer without any deactivation of the starting polymers. The heteroarm star-shaped polymers exhibited their unique stimuli-responsive behaviors in water or their film surfaces. Furthermore, linear living poly(2-methoxyethyl vinyl ether) and poly(2-phthalimidoethyl vinyl ether) were linked efficiently despite their different reactivities, producing a heteroarm star-shaped polymer with amino-containing and thermosensitive arms. The obtained star polymer exhibited unique aggregation behaviors in response to both pH and temperature in water. This report demonstrates that this one-pot arm-linking reaction is a facile and effective methodology for synthesis of heteroarm star polymers with various combinations of stimuli-responsive arm chains.

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Synthesis of miktoarm star (?-star) polymers

Cited by 424 publications

References 91 publications

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Experimental techniques in high‐vacuum anionic polymerization

Highly efficient synthesis of heteroarm star-shaped polymers using polymer-linking reaction and their characteristic stimuli-responsive behaviors

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