Synthesis and Characteristics of Succinic Anhydride- and Disodium Succinate-Terminated Low Molecular Weight Polyethylenes

Sainath, Annadanam V. Sesha; Isokawa, Motoaki; Suzuki, Makoto; Ishii, Seiichi; Matsuura, Shuhei; Nagai, Narumi; Fujita, Terunori

doi:10.1021/ma900858e

Cited by 26 publications

(17 citation statements)

References 42 publications

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“…Although AFM could slightly overestimate the lateral size because of the tip‐broadening effect, the finding of a height much lower than the lateral size of dried micelle still suggests self‐assembling into platelet‐like structures 24, 25. Formation of platelet‐like micelle with a crystalline micelle core was previously found in other self‐assembly of crystalline block copolymers due to the crystallization of the core‐forming blocks,14, 18, 24, 25 In this case, the driving force for the platelet‐like micelles formation in water is the strong insolubility and crystallization character of PE blocks, as well as the repulsions between two or three PEG blocks in one star‐block copolymer chain. It strike a balance between solvent–core interface energy and repulsion among the swollen corona chains.…”

Section: Resultsmentioning

confidence: 84%

“…Therefore, introducing crystalline core‐forming PE into self‐assembly micelles not only provides more information about micelle morphology with crystalline core but also allows the studies on confined crystallization of PE in a special micelle confinement. Moreover, these nanosized micelles have potential applications in incorporating hydrophobic chemicals 13, 14. Recently, self‐assembly of PE‐based copolymers in selective solvent has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and self‐assembly of amphiphilic star‐block copolymers consisting of polyethylene and poly(ethylene glycol) segments

Liu¹,

Li²,

Wang³

et al. 2013

J of Applied Polymer Sci

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We report on the synthesis and self-assembly in water of well-defined amphiphilic star-block copolymers with a linear crystalline polyethylene (PE) segment and two or three poly(ethylene glycol) (PEG) segments as the building blocks. Initially, alkynyl-terminated PE (PE-B) is synthesized via esterification of pentynoic acid with hydroxyl-terminated PE, which is prepared using chain shuttling ethylene polymerization with 2,6-bis[1-(2,6-dimethylphenyl) imino ethyl] pyridine iron (II) dichloride/methylaluminoxane/diethyl zinc and subsequent in situ oxidation with oxygen. Then diazido-and triazido-terminated PE (PE-(N 3 ) 2 and PE-(N 3 ) 3 ) are obtained by the click reactions between PE-B and coupling agents containing triazido or tetraazido, respectively. Finally, the three-arm and four-arm star-block copolymers, PE-b-(PEG) 2 and PE-b-(PEG) 3 , are prepared by click reactions between PE-(N 3 ) 2 or PE-(N 3 ) 3 and alkynyl-terminated PEG. The self-assembly of the resultant amphiphilic star-block copolymers in water was investigated by dynamic light scattering, transmission electron microscopy, and atomic force microscopy. It is found that, in water, a solvent selectively good for PEG blocks; these star-block copolymer chains could self-assemble to form platelet-like micelles with insoluble PE blocks as crystalline core and soluble PEG blocks as shell. The confined crystallization of PE blocks in self-assembled structure formed in aqueous solution is investigated by differential scanning calorimetry.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Synthesis and self‐assembly of amphiphilic star‐block copolymers consisting of polyethylene and poly(ethylene glycol) segments

Liu¹,

Li²,

Wang³

et al. 2013

J of Applied Polymer Sci

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“…In addition, a diol-terminated PE (Tm 121 ) is obtained by the in-situ hydrolysis of the above epoxy-terminated PE using aqueous 2-propanol. Conversely, the Alder-Ene reaction of vinyl-terminated PE (Mw 1800, Mw/Mn 2.2, vinyl group 94%, Tm 122 ) with maleic anhydride in the presence of nitrobenzene or 2,6-di-t-butyl-4-methylphenol yields the corresponding succinic anhydrideterminated PE (Tm 121 ) 85) . The succinic anhydrideterminated PE exhibits higher melt viscosity and higher thermal stability than the parent vinyl-terminated PE due to the presence of the chain-end succinic anhydride group.…”

Section: Al-and Vinyl-terminated Pesmentioning

confidence: 99%

FI Catalysts: Unique Olefin Polymerization Catalysis for Formation of Value-added Olefin-based Materials

Nakayama

Kawai

Fujita

2010

J. Jpn. Petrol. Inst.

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This review describes the olefin polymerization behavior of bis(phenoxy-imine) and bis(phenoxy-ketimine) early transition metal complexes (a.k.a. FI catalysts). FI catalysts display unique catalytic properties due to the coordination of a pair of non-symmetric, electron-withdrawing and reactive [O -, N] chelating ligands (FI ligands). Moreover, FI ligand structures can be readily tailored from the electronic and steric point of view. Thus, FI catalysts in combination with appropriate activators are capable of producing a wide variety of unique olefin-based materials (FI polymers). Specific examples of FI polymers include selective vinyl-terminated polyethylenes, ultra-high molecular weight linear polyethylenes, well-defined and controlled multimodal polyethylenes, ethylene/ polar monomer copolymers, highly syndiotactic and isotactic polypropylenes with exceptionally high Tms, ethylene-and propylene-based end-functionalized polymers, a wide array of polyolefinic block copolymers from ethylene, propylene and higher α-olefins, and ultra-fine non-coherent polyethylene particles. These FI polymers display new or enhanced material properties, and to this end, several FI polymers are now entering the industrial phase.

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“…Chain‐end‐functionalized polyethylenes (Cef‐PEs) play a very important role in constructing complex macromolecular architectures and PE property modifications. Many reviews focused on the functional modification of vinyl‐terminated polyethylene (v‐PE) . Cef‐PEs can be obtained by three general pathways: 1) utilizing chain‐transfer reactions; 2) by living coordination polymerization; and 3) modifying preformed polyethylene with unsaturated chain end.…”

Section: Introductionmentioning

confidence: 99%

“…Many reviews focused on the functional modification of vinyl‐terminated polyethylene (v‐PE) . Cef‐PEs can be obtained by three general pathways: 1) utilizing chain‐transfer reactions; 2) by living coordination polymerization; and 3) modifying preformed polyethylene with unsaturated chain end. Ye et al designed a series of polyethylenes of complex chain architectures by using a novel functionalized Pd‐diimine, such as: block‐, end‐tethered with nanoparticle, hyperbranched‐, or star copolymers .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Chain‐End‐Functionalized Polyethylenes via Thiol‐ene Click Chemistry

Zhang

et al. 2015

Macro Chemistry & Physics

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Chain‐end‐functionalized polyethylenes (Cef‐PEs: PESSH (Cef1), PESfurfuryl (Cef2), PESNH2 (Cef4), PESNH2•HCl (Cef5), PESCOONa (Cef6), PESCHA(Cef7), PESSO3Na (Cef8), PESOH (Cef9) and PESCOOH (Cef10)) are synthesized by thiol‐ene addition of vinyl‐terminated polyethylene (v‐PE) with 1,2‐ethanedithiol, furfurylmercaptan, cysteamine, cysteamine hydrochloride, sodium thioglycolate, L‐cysteine hydrochloride, sodium 2‐mercaptoethanesulfonate, mercaptoethanol, and thioglycolic acid, respectively. PEStNCO (Cef3) is obtained by subsequent reaction of Cef9 with anhydrous 4,4′‐MDI. Cef‐PE1–8 are reported for the first time. The conversions of all the reactions are up to 95%–100%. All the Cef‐PEs are characterized by NMR, GPC, DSC, FT‐IR, and TGA. In the experiments, it is found that alkaline mercaptans and solvents are adverse to the thiol‐ene click reactions.

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Synthesis and Characteristics of Succinic Anhydride- and Disodium Succinate-Terminated Low Molecular Weight Polyethylenes

Cited by 26 publications

References 42 publications

Synthesis and self‐assembly of amphiphilic star‐block copolymers consisting of polyethylene and poly(ethylene glycol) segments

Synthesis and self‐assembly of amphiphilic star‐block copolymers consisting of polyethylene and poly(ethylene glycol) segments

FI Catalysts: Unique Olefin Polymerization Catalysis for Formation of Value-added Olefin-based Materials

Synthesis of Novel Chain‐End‐Functionalized Polyethylenes via Thiol‐ene Click Chemistry

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