Graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto silica surface by Michael addition

Hayashi, Shinji; Takeuchi, Yoshihiro; Eguchi, Masumi; Iida, Takamitsu; Tsubokawa, Norio

doi:10.1002/(sici)1097-4628(19990228)71:9<1491::aid-app13>3.0.co;2-m

Cited by 57 publications

(30 citation statements)

References 10 publications

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“…For example, modification of aminated silica nanoparticles with α,β-unsaturated carbonyl compounds [39], reaction with methyl acrylate as the first step for the construction of polyamidoamine dendrimers [40] and introduction of peroxide groups capable of initiating graft polymerization [41] onto silica surfaces have been reported preciously.…”

Section: Preparation Of the Silica@pmma And Silica@pnipaam Nanoparticlesmentioning

confidence: 99%

Encapsulation of silica nanoparticles by redox-initiated graft polymerization from the surface of silica nanoparticles

Wang

Peng

Zheng

et al. 2008

Journal of Colloid and Interface Science

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Section: Preparation Of the Silica@pmma And Silica@pnipaam Nanoparticlesmentioning

confidence: 99%

Encapsulation of silica nanoparticles by redox-initiated graft polymerization from the surface of silica nanoparticles

Wang

Peng

Zheng

et al. 2008

Journal of Colloid and Interface Science

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“…[7][8][9][10]35,36 During the polymerization in organic solvents, it was confirmed that the grafted polymer chains propagate from the surface radicals formed by the thermal decomposition of azo and peroxyester groups introduced onto the surface. Therefore, we designed the radical graft polymerization of vinyl monomers from silica nanoparticle surface initiated by azo and peroxycarbonate groups in a solventfree dry-system.…”

Section: Radical Grafting Of Vinyl Polymers Onto Silica Nanoparticle mentioning

confidence: 99%

“…36 Into a 200-mL four-necked flask, as shown in Figure 2, containing 8.8 g of Silica-NH 2 , 2.5 g of MEC were sprayed and the silica was agitated at 120 rpm at 30 C under argon gas. After the reaction, unreacted MEC was removed under high vacuum.…”

Section: Introduction Of Peroxycarbonate Groups Onto Silicamentioning

confidence: 95%

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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“…It is known that surface modification by grafting of polymers onto nano-sized silica is an effective way to improve its dispensability in an organic polymeric matrix and its compatibility with the polymeric matrix, thus enhancing the properties of the composite materials. 2,3 There were a variety of attempts to achieve polymer grafted nano-sized silica composite. 4 In-situ disperse polymerization was one of the most effective methods.…”

mentioning

confidence: 99%

Surface Graft Polymerization of Styrene onto Nano-Sized Silica with a One-Pot Method

Liu

Tian

Liu

et al. 2003

Polym J

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ABSTRACT:A facile method for free radical graft polymerization of styrene onto the surface of nano-sized silica was developed by using a one-pot method. The initiator (2,2 -azobisisobutyronitrile, AIBN), the coupling agent (vinyl triethoxylsilane, VTEOS), styrene and the nano-sized silica were mixed and reacted in toluene medium. The two reactions, the copolymerization of VTEOS and styrene and the coupling reaction of the ethoxyl groups in the side chains of the copolymer and the silanol groups on the surface of the nano-sized silica, were occurred synchronously in the preparing procedure.The effects of the amount of AIBN and VTEOS, the polymerizing temperature and the polymerizing time on the conversion of styrene (C), the percentage of grafting (PG), the grafting efficiency (GE) and the average relative molecular masses (M n and M w ) of the grafted polystryrene (PS g ) and the non-grafted polystyrene (PS n ) were discussed. IR and XPS showed that the surface of the nano-sized silica had been covered partially by PS and TEM showed that the dispersibility of PS grafted nano-sized silica in organic solvent was improved.KEY WORDS In-Situ Graft Polymerization / Polystyrene / Nano-Sized Silica / One-Pot Method / Nano-sized silica has attracted increasing attention for its superior properties over conventional micrometer particles. 1 It has been widely used as filler in the manufacture of paints, rubbers, plastics, binders, functional fibers, anti-virus materials, and so on. However, its agglomeration and incompatibility with the organic matrix are impeding problems, which limit its efficient use. It is known that surface modification by grafting of polymers onto nano-sized silica is an effective way to improve its dispensability in an organic polymeric matrix and its compatibility with the polymeric matrix, thus enhancing the properties of the composite materials. 2,3 There were a variety of attempts to achieve polymer grafted nano-sized silica composite. 4 In-situ disperse polymerization was one of the most effective methods. 5 Before the in-situ disperse polymerization, initiators or polymerable groups should be introduced onto the surface of the nano-sized silica. Peroxide groups, 6, 7 azo groups 8-10 and redox initiators 11 had been introduced onto the surface of nano-sized silica for the free radical polymerization of styrene and methyl methacrylate. Acylium perchlorate groups 12 had been immobilized onto the surface of the nano-sized silica for the cationic polymerization of styrene, cyclic ethers and lactone. Styrene, 13-16 methyl methacrylate 13 and butyl methacrylate 17 had been initiated for the atom transfer radical polymerization (ATRP) on the surface of the nano-sized silica. In our previous work, the nano-sized silica had been modified with γ-methacryloxypropyl triethoxysilane for the introduction of a polymerable group, methacrylate group. Then the methacrylate group free radical copolymerized with styrene to prepare polystyrene (PS) grafted nano-sized silica via a solvent polymerization method. 18,...

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Graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto silica surface by Michael addition

Cited by 57 publications

References 10 publications

Encapsulation of silica nanoparticles by redox-initiated graft polymerization from the surface of silica nanoparticles

Encapsulation of silica nanoparticles by redox-initiated graft polymerization from the surface of silica nanoparticles

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

Surface Graft Polymerization of Styrene onto Nano-Sized Silica with a One-Pot Method

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