Photopolymerization of clay/polyurethane nanocomposites induced by intercalated initiator

Tan, Hailin; Nie, Jun

doi:10.1002/app.26878

Cited by 20 publications

(13 citation statements)

References 24 publications

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“…The effects of organoclays on the properties of PU were studied [1,3,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. PU were prepared by the following procedures: (i) distribution of clay in polyol with a subsequent reaction with diisocyanate; (ii) interaction of PU with clay in organic solvent with a subsequent evaporation of solvent; (iii) reaction of diisocyanate with hydroxyalkyl groups of organic modifier in the clay with a subsequent reaction with polyol.…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

“…It is documented that high temperature resistance of PU nanaocomposites is higher than that of pristine PU [18,19,27,30,33].…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

“…The HO-CH 2 -group can be used to react with isocyanate and, that way, to drag OCN-R between galleries or at least strengthen the interaction between urethane pre-polymer and clay [29,30]. A twofold increase of tensile strength and tensile modulus in exfoliated nanocomposites was obtained [29].…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

“…PU nanocomposites with the photoinitiator (PI) 2-hydroxy-2-methyl-1-phenylpropane-1-one (Darocur 1173) were prepared [30]. This PI-PU nanocomposite was dispersed in polymerizable resins.…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

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Polyurethane Nanocomposites

Khudyakov¹,

Zopf²,

Turro

2009

Designed Monomers and Polymers

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This review describes the present state of science and technology of photopolymerizable (UV-curable) polyurethane (PU) nanocomposites which include nanosilica and organically-modified clay (organoclay). A number of documented improvements of properties of PU nanocomposites compared to the pristine PU are presented. Many data on the structure and properties of PU nanocomposites were obtained not only for UV-cured urethane acrylate oligomers, but also for nanocomposites produced in the dark reactions. These data are critically reviewed. There is an expectation in the field of dramatic improvement of properties of PU nanocomposites under low loading (1-5 wt%) of organoclay.

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Section: Pu-organoclay Compositesmentioning

confidence: 99%

“…It is documented that high temperature resistance of PU nanaocomposites is higher than that of pristine PU [18,19,27,30,33].…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

Section: Pu-organoclay Compositesmentioning

confidence: 99%

“…PU nanocomposites with the photoinitiator (PI) 2-hydroxy-2-methyl-1-phenylpropane-1-one (Darocur 1173) were prepared [30]. This PI-PU nanocomposite was dispersed in polymerizable resins.…”

Section: Pu-organoclay Compositesmentioning

confidence: 99%

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Polyurethane Nanocomposites

Khudyakov¹,

Zopf²,

Turro

2009

Designed Monomers and Polymers

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“…The d spacing could be enlarged to 13.9 nm after photopolymerization with organoclay loading. This approach provided a novel pathway for using the highly exfoliated clay-polymer composites for designing intercalating agents capable of introducing different functional groups [8,9].…”

mentioning

confidence: 99%

On photoinduced miniemulsion polymerization of butyl acrylate with clay

Capek

2012

Designed Monomers and Polymers

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The miniemulsion polymerizations (MiEPs) of butyl acrylate (BA) initiated by UV-light have been studied. The oil-soluble dibenzoyl peroxide was used as a photoinitiator. Furthermore, the effect of sodium montmorillonite on kinetics and BA miniemulsion stabilized by anionic sodium dodecylsulfate (SDS) and anionic cetyltrimethylammonium bromide (CTAB) was studied. The polymerization rate vs. conversion curve of the photoinduced MiEP of BA was described by two and four nonstationary rate intervals. Two rate intervals with one rate maximum was observed with CTAB and four nonstationary rate intervals with two rate maxima appeared with SDS. Variation of the rate of polymerization with conversion was discussed in terms of types of initiating radicals and the gel effect.Keywords: photoinduced miniemulsion polymerization; clays; kinetics; composite nanoparticles Introduction For the past 20 years, there has been increased attention paid to the synthesis of nanocomposites based on either intercalated or exfoliated clay dispersed into various matrix polymers [1][2][3][4][5].There are also some studies on the formation of composite nanoparticles by the dispersion polymerization of monomers with clays as was reviewed by Capek [6]. As an alternative to the procedures described above, the preparation of nanocomposites using UV-curing technology has only recently been reported as summarized below.There are also several studies. Monomer polarity, monomer functionality, and the functional groups on the organoclay surfaces significantly impact both the degree of clay exfoliation and photopolymerization kinetics. The addition of polymerizable organoclays increases photopolymerization rate in sufficiently exfoliated clay systems, whereas the rate decreases with lower degrees of clay exfoliation. With clay exfoliation, the effective surface area is increased, resulting in immobilization of a greater number of the propagating radicals and decreased termination [7].A photoinitiator intercalated into montmorillonite had high photoinitiation efficiency, even only 1/100 (w/w) modified clay could initiate the radical polymerization with the 87% acrylate conversion on UV-light exposure. The d spacing could be enlarged to 13.9 nm after photopolymerization with organoclay loading. This approach provided a novel pathway for using the highly exfoliated clay-polymer composites for designing intercalating agents capable of introducing different functional groups [8,9].The functionalization of the sodium montmorillonite (MMTNa) surface with glycidylpropyl-triethoxysylane allows to obtain a new modified clay mineral which can be dispersed

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