Synthesis of A<sub>2</sub>B<sub>2</sub> star block copolymers from a heterotetrafunctional initiator

Glaied, Olfa; Delaite, Christelle; Dumas, Philippe

doi:10.1002/pola.21838

Cited by 16 publications

(14 citation statements)

References 21 publications

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“…In ATRP, the function of initiators determines the molecular weight of the polymers and structures of end groups 10–15. Most of the initiators used are organic halides with a potentially active carbon‐halogen bond 1–3, 16–18.…”

Section: Introductionmentioning

confidence: 99%

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

Zhang

Zhu

et al. 2007

J. Polym. Sci. A Polym. Chem.

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A metal complex, cobalt(II) 2‐ethylhexanoate (CEH), was added to the system of thermal‐initiated reversible addition‐fragmentation chain transfer (RAFT) polymerization of methyl methacrylate (MMA) with 2‐cyanoprop‐2‐yl 1‐dithionaphthalate (CPDN) as the RAFT agent at 115 °C. The polymerization rate was remarkably enhanced in the presence of CEH in comparison with that in the absence of CEH, and the increase of the CPDN concentration also accelerated the rate of polymerization. The polymerization in the concurrence of CPDN and CEH demonstrated the characters of “living”/controlled free radical polymerization: the number‐average molecular weights (Mn) increasing linearly with monomer conversion, narrow molecular weight distributions (Mw/Mn) and obtained PMMA end‐capped with the CPDN moieties. Meanwhile, CEH can also accelerate the rate of RAFT polymerization of MMA using the PMMA as macro‐RAFT agent instead of CPDN. Similar polymerization profiles were obtained when copper (I) bromide (CuBr)/N,N,N′,N′′,N′′‐pentamethyldiethylenetriamine was used instead of CEH. Extensive experiments in the presence of butyl methacrylate, bis(cyclopentadienyl) cobalt(II) and cumyl dithionaphthalenoate were also conducted; similar results as those of MMA/CPDN/CEH system were obtained. A transition of the polymerization mechanism, from RAFT process without CEH addition to atom transfer radical polymerization in the presence of CEH, was possibly responsible for polymerization profiles. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 5722–5730, 2007

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Section: Introductionmentioning

confidence: 99%

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

Zhang

Zhu

et al. 2007

J. Polym. Sci. A Polym. Chem.

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“…The compound B, after separation, can be used as a heteromultifunctional initiator to synthesize A 2 B 2 star block copolymer. 15,19 The partially protected heterotetrafunctional initiators C1 and C2 bear one tertiary bromide function for the ATRP of styrene.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of PS(PEO)3 star block copolymers from a heterotetrafunctional initiator

Glaied

Delaite

Dumas

2007

J. Polym. Sci. A Polym. Chem.

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“…Meanwhile, the appearance of “click” reactions8 also provides a powerful method for the synthesis and functionalization of polymers with unique structures during the past few years due to their high specificity, quantitative yields, and near‐perfect fidelity in the presence of most functional groups 9, 10. Therefore, by the combination of CLP techniques and “click” reactions, various types of miktoarm star copolymers with varying chemical composition and molecular topology such as AB 2 ,11 A 2 B 2 ,12–15 A 3 B 3 ,16 ABC,17–19 and so forth have been synthesized.…”

Section: Introductionmentioning

confidence: 99%

Calixarene‐centered amphiphilic A₂B₂ miktoarm star copolymers based on poly(ε‐caprolactone) and poly(ethylene glycol): Synthesis and self‐assembly behaviors in water

Gou¹,

Zhu²,

Shen³

2010

J. Polym. Sci. A Polym. Chem.

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Novel calixarene‐centered amphiphilic A2B2 miktoarm star copolymers composed of two PCL arms and two PEG arms with calix[4]arene as core moiety were synthesized by the combination of CROP and “click” chemistry. First, a heterotetrafunctional calix[4]arene derivative with two hydroxyl groups and two alkyne groups was designed as a macroinitiator to prepare calixarene‐centered PCL homopolymers (C4‐PCL) by CROP in the presence of Sn(Oct)2 as catalyst at 110 °C. Next, azide‐terminated PEG (A‐PEG) was synthesized by tandem treating methoxy poly(ethylene glycol)s (mPEG) with 4‐chlorobutyryl chloride and NaN3. Finally, copper(I)‐catalyzed cycloaddition reaction between C4‐PCL and A‐PEG led to A2B2 miktoarm star copolymer [C4S(PCL)2‐(PEG)2]. 1H NMR, FT‐IR, and SEC analyses confirmed the well‐defined miktoarm star architecture. These amphiphilic miktoarm star copolymers could self‐assemble into multimorphological aggregates in water. The calix[4]arene moieties with a cavity <1 nm on the hydrophilic/hydrophobic interface of these aggregates may provide potential opportunities to entrap guest molecules for special applications in supermolecular science. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

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Synthesis of A₂B₂ star block copolymers from a heterotetrafunctional initiator

Cited by 16 publications

References 21 publications

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

Synthesis of PS(PEO)3 star block copolymers from a heterotetrafunctional initiator

Calixarene‐centered amphiphilic A₂B₂ miktoarm star copolymers based on poly(ε‐caprolactone) and poly(ethylene glycol): Synthesis and self‐assembly behaviors in water

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Synthesis of A2B2 star block copolymers from a heterotetrafunctional initiator

Cited by 16 publications

References 21 publications

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

“Living”/controlled free radical polymerization of MMA in the presence of cobalt(II) 2‐ethylhexanoate: A switch from RAFT to ATRP mechanism

Synthesis of PS(PEO)3 star block copolymers from a heterotetrafunctional initiator

Calixarene‐centered amphiphilic A2B2 miktoarm star copolymers based on poly(ε‐caprolactone) and poly(ethylene glycol): Synthesis and self‐assembly behaviors in water

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Product

Resources

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Synthesis of A₂B₂ star block copolymers from a heterotetrafunctional initiator

Calixarene‐centered amphiphilic A₂B₂ miktoarm star copolymers based on poly(ε‐caprolactone) and poly(ethylene glycol): Synthesis and self‐assembly behaviors in water