Surface modification of chitosan powder by grafting of ‘dendrimer-like’ hyperbranched polymer onto the surface

A condensed overview discusses the existing grafting approaches and the surface behavior of various hyperbranched polymers. We focus on the recent strategies and corresponding characterization of the resulting surface morphologies and structures with a number of relevant recent results from the authors' own research and existing literature. Some results discussed here are important for prospective applications of hyperbranched polymers in biomedical fields, for resistive coatings, tough blends, and reinforced nanocomposites are briefly summarized as well. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 83-100, 2012 KEYWORDS: adsorption; hyperbranched; LB films; structural characterization; surfaces INTRODUCTION This publication presents a condensed overview of the existing grafting approaches as applied to hyperbranched polymers and discusses the surface morphologies of these polymers and corresponding composites and coatings. We mostly focus on the recent strategies and corresponding characterization of the resulting surface morphologies and structures developed in the authors' group with some relevant examples from current literature. A number of relevant results are also included here especially in relation to recent developments related to novel synthetic approaches of hyperbranched molecules as well as emerging applications of hyperbranched polymers and coatings for biomedical purposes, as resistive coatings, tough blends, and reinforced nanocomposites. Some comprehensive recent reviews on highly branched polymers, which are focused mainly on synthetic aspects can be found in literature.

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“…92 It was found that hyperbranched PAMAM structure was propagated from the chitosan surface (Fig. 4).…”

Section: Growth and Grafting Of Hyperbranched Polymersmentioning

confidence: 95%

Assembling hyperbranched polymerics

Peleshanko¹,

Tsukruk²

2011

J Polym Sci B Polym Phys

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“…The same tendency was observed for grafting of PAMAM onto silica nanoparticles in a methanol solvent system. [30][31][32][33] Figure 3(B) and (C) also show FT-IR spectra of PAMAM-grafted silica nanoparticles with repeated reaction cycles of 3-times and 6-times. The absorption at 1655 cm À1 , characteristic of amide group, increased with repeated reaction cycles.…”

Section: Grafting Of Hyperbranched Poly(amidoamine) Onto Silica Nanopmentioning

confidence: 99%

Surface Grafting of Polymers onto Nanoparticles in a Solvent-Free Dry-System and Applications of Polymer-grafted Nanoparticles as Novel Functional Hybrid Materials

Tsubokawa

2007

Polym J

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ABSTRACT:For the prevention of environmental pollution and simplification of reactions, scale-up synthesis of polymer-grafted inorganic nanoparticles in a solvent-free dry-system is reviewed. The grafting of polymers onto nanoparticles in a solvent-free dry-system was achieved by spraying monomers onto nanoparticles having initiating group. After the reaction, unreacted monomer and by-products were removed under high vacuum. For example, grafting of hyperbranched poly(amidoamine) (PAMAM) was successfully achieved using dendrimer synthesis methodology in a solvent-free dry-system. The percentage of PAMAM grafting onto the nanoparticle surface was 141% with repeated reaction cycles of 8-times. In addition, radical graft polymerization of vinyl monomers onto silica nanoparticles was achieved by spraying the monomers onto silica nanoparticles containing azo and peroxycarbonate groups in a solvent-free dry-system. The formation of ungrafted polymer was depressed in comparison with graft polymerization in solution: the grafting efficiency was 90-95%. PAMAM-grafted silica dispersed uniformly in epoxy resin and has an ability to cure the epoxy resin. Glass transition temperature of cured material was much higher than that of the material cured by conventional curing agents. The immobilization of norbornadiene, capsaicin, and flame retardant onto PAMAM-grafted nanoparticle and the properties of the resulting materials are also described.

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“…[1][2][3][4][5] We have reported the surface initiated graft polymerization of various monomers onto silica nanoparticle by using previously introduced initiating groups on the surface, such as azo 6 and peroxyester, 7 acylium perchlorate, 8 and potassium carboxylate. 9 In addition, we have reported that hyperbranched poly-(amidoamine) (PAMAM) can be grown from amino groups on silica nanoparticles, 10 chitosan powder, 11 and carbon black 12 surfaces using dendrimer synthesis methodology ( Figure 1). Grafting was achieved by repeating the following two processes in methanol [10][11][12] and in solvent-free dry-system: 13 (1) Michael addition of amino groups on the surface to methyl acrylate (MA), and (2) amidation of the resulting terminal methyl ester groups with ethylenediamine (EDA).…”

mentioning

confidence: 99%

“…9 In addition, we have reported that hyperbranched poly-(amidoamine) (PAMAM) can be grown from amino groups on silica nanoparticles, 10 chitosan powder, 11 and carbon black 12 surfaces using dendrimer synthesis methodology ( Figure 1). Grafting was achieved by repeating the following two processes in methanol [10][11][12] and in solvent-free dry-system: 13 (1) Michael addition of amino groups on the surface to methyl acrylate (MA), and (2) amidation of the resulting terminal methyl ester groups with ethylenediamine (EDA). The resulting PAMAM-grafted silica has potential as a catalyst and an enzyme support, because they have many terminal amino groups.…”

mentioning

confidence: 99%

Curing of Epoxy Resin by Hyperbranched Poly(amidoamine)-grafted Silica Nanoparticles and Their Properties

Ukaji

Takamura

Shirai

et al. 2007

Polym J

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Hyperbranched poly(amidoamine)-grafted silicas having terminal boron trifluoride groups (Silica-PAMAM:BF 3 ) were prepared by the treatment of terminal amino groups of the hyperbranched PAMAM-grafted silica with boron trifluoride diethyl ether complex. Silica-PAMAM:BF 3 has an ability to cure epoxy rein to give a novel epoxy resin/silica nanocomposite. It was observed that after the curing by Silica-PAMAM, the absorbance of amino groups decreased. It was confirmed by AFM that PAMAM-grafted silica nanoparticles were uniformly dispersed in the cured epoxy resin matrix. The thermal stability and glass-transition temperature of the epoxy resin/silica nanocomposite were considerably higher than those using ethylenediamine (EDA) as a curing agent in the presence of untreated silica. The storage modulus of the epoxy resin/silica nanocomposite in rubbery region increased and the peak area of tan curve at glass-transition region decreased in comparison with epoxy resin cured by EDA in the presence of untreated silica. In addition, the glass-transition temperature increased with increasing content of Silica-PAMAM:BF 3 . The epoxy resin/silica nanocomposite was found to show higher adhesive strength between aluminum plates. Based on the above results, it is expected that silica nanoparticles are incorporated uniformly with chemical bonds in the continuous epoxy resin network.

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Surface modification of chitosan powder by grafting of ‘dendrimer-like’ hyperbranched polymer onto the surface

Cited by 98 publications

References 14 publications

Assembling hyperbranched polymerics

Assembling hyperbranched polymerics

Surface Grafting of Polymers onto Nanoparticles in a Solvent-Free Dry-System and Applications of Polymer-grafted Nanoparticles as Novel Functional Hybrid Materials

Curing of Epoxy Resin by Hyperbranched Poly(amidoamine)-grafted Silica Nanoparticles and Their Properties

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