Successful Thermal Self-Polycondensation of AB<sub>2</sub> Monomer to Form Hyperbranched Aromatic Polyamide

Yang, Gang; Jikei, Mitsutoshi; Kakimoto, Masa–aki

doi:10.1021/ma980786+

Cited by 63 publications

(47 citation statements)

References 16 publications

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“…[14][15][16][17][18][19] Kim synthesized hyperbranched aromatic polyamides by self condensation of either 3,5-diaminobenzoyl chloride or 3-aminoisophthaloyl chloride, the latter showing birefringence in an amide solvent (NMP). [12,14] Both thermal and direct polymerization of AB 2 monomers have been used by Kakimoto et al [16,17] to prepare HB aromatic polyamides. Recently, hyperbranched aramids have been synthesized also from commercial A 2 (diamine) + B 3 (triacid) reagent pairs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Monticelli¹,

Mendichi²,

Bisbano

et al. 2000

Macromol. Chem. Phys.

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A new layout of complementary logic circuits based on p‐channel carbon nanotube and n‐channel zinc oxide nanowire transistors is presented by Takhee Lee and co‐workers . The processing is a hybrid approach, combining advantageous characteristic functions for the modulation of the current and operating voltage in transistors through proton radiation‐generated charges, allowing a simple method of designing favorable logic circuits.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Monticelli¹,

Mendichi²,

Bisbano

et al. 2000

Macromol. Chem. Phys.

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“…In the literature, the authors selected 3,5-bis(4-aminophenoxy)benzoic acid as an unprotected AB 2 building block, which was synthesized by them from 3,5-dihydroxybenzoic acid and 4-fluoronitrobenzene in the presence of sodium carbonate. 53 In this study, we selected 2, which was commercially available, as an unprotected AB 2 building block. Although the steric hindrance was higher in 2 than in 3,5-bis(4-aminophoxy)benzoic acid, the desired structures were still obtained through corresponding changes in the activation and reaction conditions.…”

Section: Synthesis Of the Dendronsmentioning

confidence: 99%

Facile synthesis of dendronized polyamides with chloromethyl groups in the periphery and some properties

et al. 2007

J of Applied Polymer Sci

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A novel dendronized aromatic polyamide with a polyamide backbone and chloromethylene-endfunctionalized polyamide dendrons is reported for the first time. An attempt at a one-pot synthesis of end-functionalized dendronized polymers with a macromonomer strategy without protection and deprotection procedures is also reported for the first time. The results from Fourier transform infrared and NMR spectral analysis indicated that perfect coverage of the chloromethyl groups in the periphery of the resulting polymers was obtained. Data from gel permeation chromatography analysis showed a typical weight-average molecular weight (M w ) of 76,678 and a polydispersity of 2.44 for the first-generation polymers and an M w of 41,554 and a polydispersity of 2.74 for the second-generation polymers. The solubility in solvents for the resulting polymers was improved remarkably because of the introduction of the dendritic fragments and the existence of the periphery functional groups. Both the glasstransition temperature and onset decomposition temperature decreased versus those of the linear aromatic polyamides, but the 50% weight loss temperature was still up to 7238C. The X-ray diffractograms indicated only an amorphous peak in the wide-angle region of 24-258.

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“…Miller and Neenan first reported the preparation of hyperbranched poly(aryl ether)s by a nucleophilic aromatic substitution 5. Hyperbranched poly(ether ketone)s,6–8 polyamides,9–15 polyimides,16–21 poly(phenylene oxide)s,22, 23 poly(phenylene sulfide)s,24, 25 and poly(ether sulfone)s26–28 have already been reported in the literature. It is reported that the introduction of branching points to the rigid aromatic polymers results in an improved solubility, low viscosity, and low crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of hyperbranched poly(ether sulfone)s prepared by self‐polycondensation of novel AB₂ monomer

Jikei

Uchida

Haruta

et al. 2012

J. Polym. Sci. A Polym. Chem.

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Hyperbranched poly(ether sulfone)s were prepared by the self‐polycondensation of the novel AB2 monomer, 4‐(3,5‐hydroxyphenoxy)‐4′‐fluorodiphenylsulfone. The high‐molecular‐weight polymers were isolated in good yields. The degree of branching (DB) of the resulting polymers was investigated by the preparation of dendritic and linear model compounds. The DB determined by gated decoupling 13C NMR measurements was in the range 0.17–0.41 and was dependent on the base used for the self‐polycondensation. It was found that cesium fluoride was an effective base to form the polymer having the DB of 0.41. The resulting hyperbranched poly(ether sulfone)s showed good solubility in organic solvents. The solubility and the glass transition temperature of the polymers were influenced by the terminal functional groups. The unique thermal crosslinking phenomenon was observed during the DSC measurements of the hydroxyl‐terminated hyperbranched poly(ether sulfone) under air condition. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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Successful Thermal Self-Polycondensation of AB₂ Monomer to Form Hyperbranched Aromatic Polyamide

Cited by 63 publications

References 16 publications

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Facile synthesis of dendronized polyamides with chloromethyl groups in the periphery and some properties

Synthesis and properties of hyperbranched poly(ether sulfone)s prepared by self‐polycondensation of novel AB₂ monomer

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Successful Thermal Self-Polycondensation of AB2 Monomer to Form Hyperbranched Aromatic Polyamide

Cited by 63 publications

References 16 publications

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Synthesis, characterization and properties of a hyperbranched aromatic polyamide: poly(ABZAIA)

Facile synthesis of dendronized polyamides with chloromethyl groups in the periphery and some properties

Synthesis and properties of hyperbranched poly(ether sulfone)s prepared by self‐polycondensation of novel AB2 monomer

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Product

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Successful Thermal Self-Polycondensation of AB₂ Monomer to Form Hyperbranched Aromatic Polyamide

Synthesis and properties of hyperbranched poly(ether sulfone)s prepared by self‐polycondensation of novel AB₂ monomer