Hyperbranched Polymers with Controlled Degree of Branching from 0 to 100%

Segawa, Yukari; Higashihara, Tomoya; Ueda, Mitsuru

doi:10.1021/ja105213r

Cited by 87 publications

(91 citation statements)

References 21 publications

(34 reference statements)

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“…Some literatures have illustrated one-pot procedure to control over polymer topologies with different single solvents, different thermostated temperatures or adding specific reagents [52][53][54][55]. Besides, cupric complexes (i.e., Cu(I)/ligand or Cu(II)/ligand) have significantly different solubilities in various solvents at various temperatures [56].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Solubility of Copper Complex in Atom Transfer Radical Self-Condensing Vinyl Polymerizations to Control Polymer Topology via One-Pot to the Synthesis of Hyperbranched Core Star Polymers

2014

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Abstract:In this paper, we propose a simple one-pot methodology for proceeding from atom transfer reaction-induced conventional free radical polymerization (AT-FRP) to atom transfer self-condensing vinyl polymerization (AT-SCVP) through manipulation of the catalyst phase homogeneity (i.e., CuBr/2,2'-bipyridine (CuBr/Bpy)) in a mixture of styrene (St), 4-vinyl benzyl chloride (VBC), and ethyl 2-bromoisobutyrate. Tests of the solubilities of CuBr/Bpy and CuBr2/Bpy under various conditions revealed that both temperature and solvent polarity were factors affecting the solubility of these copper complexes. Accordingly, we obtained different polymer topologies when performing AT-SCVP in different single solvents. We investigated two different strategies to control the polymer topology in one-pot: varying temperature and varying solvent polarity. In both cases, different fractions of branching revealed the efficacy of varying the polymer topology. To diversify the functionality of the peripheral space, we performed chain extensions of the resulting hyperbranched poly(St-co-VBC) macroinitiator (name as: hbPSt MI) with either St or tBA (tert-butyl acrylate). The resulting hyperbranched core star polymer had high molecular weights (hbPSt-g-PSt: Mn = 25,000, Đ = 1.77; hbPSt-g-PtBA: Mn = 27,000, Đ = 1.98); hydrolysis of the tert-butyl groups of the later provided a hyperbranched core star polymer featuring hydrophilic poly(acrylic acid) segments. OPEN ACCESSPolymers 2014, 6 2553

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Section: Introductionmentioning

confidence: 99%

Tuning the Solubility of Copper Complex in Atom Transfer Radical Self-Condensing Vinyl Polymerizations to Control Polymer Topology via One-Pot to the Synthesis of Hyperbranched Core Star Polymers

2014

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“…However, this method is restricted to relatively small peptides, and racemization of the C-terminal amino acid residue is a nonnegligible problem. Considerable efforts have been devoted in developing alternative strategies to obtain thioester peptides indirectly from non-thioester precursors; this type of synthesis is compatible with standard Fmoc chemistry [39,[59][60][61][62][63].…”

Section: Nclmentioning

confidence: 99%

Progress in Chemical Synthesis of Peptides and Proteins

Hou

Zhang

Liu

2017

Trans. Tianjin Univ.

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For the proteins that cannot be expressed exactly by cell expression technology (e.g., proteins with multiple posttranslational modifications or toxic proteins), chemical synthesis is an important substitute. Given the limited peptide length offered by solid-phase peptide synthesis invented by Professor Merrifield, peptide ligation plays a key role in long peptide or protein synthesis by ligating two small peptides to a long one. Moreover, high-molecularweight proteins must be synthesized using two or more peptide ligation steps, and sequential peptide ligation is such an efficient way. In this paper, we reviewed the development of chemical protein synthesis, including solid-phase peptide synthesis, chemical ligation, and sequential chemical ligation.

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“…Quite recently, the first synthesis of HBPs with controlled DBs by the one-pot polycondensation of the AB 2 monomer of 1-[4-(4phenoxyphenoxy)phenyl]ethanone (25) in various molar ratios of trifluoromethanesulfonic acid (TFSA) to the monomer was reported (48,49) (Fig. 20).…”

Section: Controlled Degree Of Branch In Hyperbranched Polymermentioning

confidence: 99%

Polycondensation

Higashihara¹,

Ueda²

2013

Encyclopedia of Polymer Science and Technology

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There are many technological challenges of the twenty‐first century including energy, information, and transportation. During the continuous innovations, polycondensates have been supporting our modern life in the global society. The synthetic methodology of polycondensation allows for a wide variety of available monomers and polymer structures than any other synthetic polymerization technique, which are derived from almost infinite kinds of designing structures in monomers compared to vinyl monomers. In addition, the high performance of specially designed polycondensates (eg, high thermal, chemical, mechanical, and dimensional stability) have provided a breakthrough, especially in material science and industry, as represented by the developments of superengineering plastics, such as wholly aromatic polyamides, polyimides, poly(phenylene ether)s, poly(ether sulfone)s, poly(ether ketone)s, and poly(ether ether ketone)s. Polycondensation chemistry is also used for preparing recent optoelectronic applications including organic electroluminescence, field–effect transistors, organic solar cells, polymer memories, and so forth. This article, details the basic principles of polycondensation and recent advances in polycondensation.

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Hyperbranched Polymers with Controlled Degree of Branching from 0 to 100%

Cited by 87 publications

References 21 publications

Tuning the Solubility of Copper Complex in Atom Transfer Radical Self-Condensing Vinyl Polymerizations to Control Polymer Topology via One-Pot to the Synthesis of Hyperbranched Core Star Polymers

Tuning the Solubility of Copper Complex in Atom Transfer Radical Self-Condensing Vinyl Polymerizations to Control Polymer Topology via One-Pot to the Synthesis of Hyperbranched Core Star Polymers

Progress in Chemical Synthesis of Peptides and Proteins

Polycondensation

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