Grafting of hyperbranched polymers onto ultrafine silica: postgraft polymerization of vinyl monomers initiated by pendant initiating groups of polymer chains grafted onto the surface

Hayashi, Shinji; Fujiki, Kazuhiro; Tsubokawa, Norio

doi:10.1016/s1381-5148(00)00053-5

Cited by 76 publications

(34 citation statements)

References 14 publications

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“…In the chemical industry, during the past 15 years, research has been devoted to the development of a new industrial process that incorporates nanoparticles into a polymeric matrix, providing a new class of polymeric materials that offers the strength of the nano-oxides, with the flexibility of organic polymer [8,9]. Nano-sized SiO 2 is characterized by its small size, large specific area, active function, and strong interfacial interaction with the organic polymer [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano Silicon Dioxide Addition on Some Properties of Heat Vulcanized Maxillofacial Silicone Elastomer

Tukmachi¹,

Ali²

2017

IOSRJPBS

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Section: Introductionmentioning

confidence: 99%

Effect of Nano Silicon Dioxide Addition on Some Properties of Heat Vulcanized Maxillofacial Silicone Elastomer

Tukmachi¹,

Ali²

2017

IOSRJPBS

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“…Conventional radical polymerization of vinyl monomers from radicals created at the silica surface after thermal decomposition of azo groups previously bound to the solid surface was at first considered. [21][22][23] This way was widely investigated by Tsubokawa and coworkers which tested various thermosensitive species: azo, [24][25][26][27][28] peroxyester, 29 or peroxycarbonate 30 groups, able to be broken down with formation of radicals on the silica surface. In the above radical grafting systems, polymerization is initiated by both surface and fragment radicals formed by decomposition of azo and peroxide groups on the surface, so leading to production of ungrafted polymer.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(methyl methacrylate)‐grafted silica microparticles

Derouet

Thuc

2008

J of Applied Polymer Sci

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A procedure to synthesize poly(methyl methacrylate)-grafted silica microparticles was developed by using radical photopolymerization of methyl methacrylate (MMA) initiated from N,N-diethyldithiocarbamate (DEDT) groups previously bound to the silica surface (grafting ''from''). The functionalization of silica microparticles with DEDT groups was performed in two steps: introduction of chlorinated functions onto the surface of silica particles, and then nucleophilic substitution of chlorines by DEDT functions via a S N 2 mechanism. The study was performed with a Kieselgel 1 S silica which was initially chlorinated in surface, either by direct chlorination of silanols with thionyl chloride, or by using a condensation reaction between silanols and a chlorofunctional trialkoxysilane reagent, 4-(chloromethyl)phenyltrimethoxysilane and chloromethyltriethoxysilane, respectively. Three types of DEDT-functionalized silica microparticles were prepared with a good control of the reactions, and then characterized by solid-state 13 C and 29 Si CP/MAS NMR. Their ability to initiate MMA photopolymerization was studied. The kinetics of MMA photopolymerization was followed by HPLC and 1 H-NMR. Whatever the silica used the grafting progresses very slowly. On the other hand, the conversion of MMA in PMMA grafts is depending on the structure of the DEDT-functionalized Kieselgel 1 S used. Poly(methyl methacrylate)-grafted silica microparticles bearing high length grafts (DP n about 100) were synthesized.

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“…[17][18][19] According to a survey of the literature, NPs that are widely used in industry include zinc oxide (ZnO), titanium dioxide (TiO 2 ), and barium sulfate (BaSO 4 ). The addition of TiO 2 20 and ZnO to polymers can improve the mechanical and optical properties of polymers due to the small size, large specific area, and quantum effect of the NPs, as well as the strong interfacial interaction between the organic polymer and inorganic NPs.…”

mentioning

confidence: 99%

Influence of nanoparticles on color stability, microhardness, and flexural strength of acrylic resins specific for ocular prosthesis

Andreotti

Goiato

Moreno

et al. 2014

IJN

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The aim of this study was to assess the effect of adding nanoparticles to N1 acrylic resin intended for artificial sclera, in terms of the color stability, microhardness, and flexural strength of the resin. Three hundred samples of N1 acrylic resin were used: 100 samples for color stability and microhardness tests (each test was performed on the opposite side of each sample), and 200 samples for flexural strength testing (100 samples before and after 1,008 hours of accelerated aging). Samples for each test were separated into ten groups (n=10), ie, without nanoparticles (control group) or with nanoparticles of zinc oxide, titanium dioxide (TiO 2 ), and barium sulfate at weight concentrations of 1%, 2%, and 2.5% (nanoparticle groups). Data were subjected to statistical analysis with nested analysis of variance and Tukey’s test ( P <0.05 significance level). Among the nanoparticle groups, the TiO 2 groups showed better color stability at all concentrations. Microhardness values increased after artificial aging, except for the control and zinc oxide groups. After aging, the 1%–2% TiO 2 groups had significantly higher microhardness values compared with the other nanoparticle groups. Before aging, there was a significant difference in flexural strength between the control and nanoparticle groups. After aging, the control and TiO 2 groups, regardless of concentration, showed the lowest flexural strength values. Incorporation of nanoparticles directly influenced the acrylic resin properties, with TiO 2 being the most influential nanoparticle in terms of the evaluated properties.

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Grafting of hyperbranched polymers onto ultrafine silica: postgraft polymerization of vinyl monomers initiated by pendant initiating groups of polymer chains grafted onto the surface

Cited by 76 publications

References 14 publications

Effect of Nano Silicon Dioxide Addition on Some Properties of Heat Vulcanized Maxillofacial Silicone Elastomer

Effect of Nano Silicon Dioxide Addition on Some Properties of Heat Vulcanized Maxillofacial Silicone Elastomer

Synthesis and characterization of poly(methyl methacrylate)‐grafted silica microparticles

Influence of nanoparticles on color stability, microhardness, and flexural strength of acrylic resins specific for ocular prosthesis

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