Synthesis of Polyamide Dendrimers bearing Multiple Hydrogen Bonding Parts on                 the Periphery

Kouketsu, Takayuki; Yokomachi, Kazutoshi; Kakimoto, Masa–aki; Jikei, Mitsutoshi

doi:10.1177/0954008304042385

Cited by 6 publications

(9 citation statements)

References 61 publications

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“…In addition, a large number of terminal groups on the dendrimers are available for the further functionalization, and these end groups influence the solubility and adhesive properties of the dendrimers. 24,25 Further studies are required to understand the characteristics of dendrimers of this class of macromolecules. There are reports of several attempts for using the multi-valency of dendrimers as new functional materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of dendrimer-functionalized magnetic iron oxide nanoparticles on improving thermal and mechanical properties of DGEBA/IPD epoxy networks

Jafari-Soghieh

Maleki

Behniafar

2017

High Performance Polymers

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In this work, the effects of dendrimer-functionalized magnetic iron oxide nanoparticles (Fe3O4@D-NH2) on improving thermal and mechanical properties in epoxy networks (ENs) are investigated. Magnetic iron oxide nanoparticles are prepared by coprecipitation of iron (II) chloride tetrahydrate with iron (III) chloride hexahydrate. Poly(amido-amine) dendrimer is synthesized by Michael addition reaction from diethylenetriamine with methyl acrylate. The fabricated dendrimer has been used to stabilize and functionalize magnetic nanoparticles. Then, magnetic iron oxide nanoparticles are encapsulated within the dendrimer and subsequently loaded into diglycidyl ether of bisphenol A (DGEBA) epoxy resin in two different contents, that is, 5 and 10 wt%. The amine groups of dendrimer-functionalized magnetic iron oxide nanoparticles allow them to be covalently linked to the polymer matrix alongside the main amine hardener. The resulting epoxy/magnetic iron oxide nanocomposites are thoroughly characterized by X-ray diffraction analysis, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. Probing the thermal behaviors of the epoxy/magnetic iron oxide nanocomposites by thermogravimetric analysis indicated that the temperature of 10% decomposition and the temperatures of the maximum decomposition rate values of Fe3O4@D-NH2@EN series increased up to 20 and 10°C, respectively. Dynamic mechanical thermal analysis also indicated that the organo-magnetic iron oxide nanoparticles can lead to an excellent interaction between the nanoparticles and the resulting DGEBA/isophorone diamine ENs.

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Section: Introductionmentioning

confidence: 99%

Effect of dendrimer-functionalized magnetic iron oxide nanoparticles on improving thermal and mechanical properties of DGEBA/IPD epoxy networks

Jafari-Soghieh

Maleki

Behniafar

2017

High Performance Polymers

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“…Recently, we prepared hyperbranched polymers, such as aromatic polyamides, [5][6][7][8][9][10][11][12][13][14][15][16][17][18] polyimides, [19][20][21][22][23][24]15,25 polyesters, 26 polysiloxanes, 27,28 poly(benzoxazole)s, [29][30][31][32][33] poly(triphenylamine), 34 PES [35][36][37][38][39] and poly (siloxysilane), [40][41][42][43][44][45] from AB 2 type monomers, and investigated their mechanical properties. Moreover, to synthesize polyamides, 46 polyimides 47,23,48 and polyphthalocyanines, [49][50][51]…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

Kakimoto

Grunzinger

Hayakawa

2010

Polym J

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Hyperbranched polymers possess unique characteristics such as low viscosity, high solubility in organic solvents and a high degree of functionality at the terminal position. However, hyperbranched polymers also possess weak mechanical properties. In this study, hyperbranched poly(ether sulfone)s (HBPES) possessing sulfonic acid moieties at the terminal position were prepared by reacting electrophilic sulfonium ions with electron-rich benzene rings from two kinds of AB 2 monomers. To address the weakness of HBPES, hybrid materials containing linear and hyperbranched PES were investigated. Linear and hyperbranched multiblock copolymers were successfully prepared by reacting oligomeric linear PES and AB 2 monomers. From the multiblock copolymers, linear and hyperbranched PES blends were prepared and applied as ion-exchange membranes for fuel cells. Films containing various ratios of linear and hyperbranched PES terminated by sulfonyl chloride groups were prepared via casting from a solution of DMAc. The results indicated that tethers between linear and hyperbranched polymers were important for controlling the size of the phases and for preventing the dissolution of HBPES in water; thus, linear and hyperbranched polymers were crosslinked by simply heating blends of both films. Finally, hybrid films containing sulfonic acid groups were obtained by hydrolyzing the sulfonyl chloride moieties. The resultant films showed ion-exchange capacities that were comparable to that of a Nafion 117 membrane (Dupont, Tokyo, Japan).

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“…Linear polyamides are commonly available polymers, and dendrimers with amide bonds are also popular topics in the synthesis of dendritic macromolecules, including polyamidoamines, 20-23 polyamides, [24][25][26] polyaramides, [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] poly(ester amide)s, 26 and poly(ether amide)s. 26,[37][38][39][40][41] However, reports on dendronized polymers with amide bonds are relatively scarce. Li and coworkers 44,45 synthesized dendronized polyamides with polyether dendrons.…”

Section: Introductionmentioning

confidence: 99%

“…Linear polyamides are commonly available polymers, and dendrimers with amide bonds are also popular topics in the synthesis of dendritic macromolecules, including polyamidoamines,20–23 polyamides,24–26 polyaramides,27–43 poly(ester amide)s,26 and poly(ether amide)s 26, 37–41. However, reports on dendronized polymers with amide bonds are relatively scarce.…”

Section: Introductionmentioning

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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Synthesis of Polyamide Dendrimers bearing Multiple Hydrogen Bonding Parts on the Periphery

Cited by 6 publications

References 61 publications

Effect of dendrimer-functionalized magnetic iron oxide nanoparticles on improving thermal and mechanical properties of DGEBA/IPD epoxy networks

Effect of dendrimer-functionalized magnetic iron oxide nanoparticles on improving thermal and mechanical properties of DGEBA/IPD epoxy networks

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

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

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