Back Cover: Macromol. Mater. Eng. 11/2006

Saito, Tomotaka; Okamoto, Masami; Hiroi, Ryoichi; Yamamoto, Masakazu; Shiroi, Takashi

doi:10.1002/mame.200690023

Cited by 16 publications

(26 citation statements)

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“…[3] The shear stress has little effect on the delamination of the layer as compared with the optimal interlayer structure on OMLF. [4] This reasoning is consistent with the intercalated structure reported by so many nano-composite researchers, who prepared intercalated (not exfoliated) nano-composites via simple melt extrusion technique. [5] Although the intercalation technology of the polymer melt is developed along with the current industrial process, such as extrusion and injection molding, we have to develop a more innovative compounding process, especially in the preparation of the nano-composites possessing exfoliated layered fillers.…”

Section: Introductionsupporting

confidence: 78%

Delamination of Organically Modified Layered Filler via Solid‐State Processing

Saito

Okamoto

Hiroi

et al. 2006

Macromol. Rapid Commun.

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Summary: Solid‐state processing for the preparation of poly(p‐phenylenesulfide) (PPS‐) based nano‐composites having finely dispersed layered fillers was conducted. The mixture of PPS and organically modified layered filler (OMLF) (95/5 wt./wt.) was subjected to the processing using thermostated hot‐press at 150 °C, below Tm of PPS (i.e., PPS is still at the solid‐state), and applying pressures of 33 MPa for 30 s. The mixture exhibited disorder and delaminated layer structure with the thickness of 10–20 nm into the PPS matrix. In contrast, a nano‐composite prepared by melt compounding at 300 °C for 3 min showed large stacked silicate layers in the PPS matrix. The processing led to delamination of the silicate layers and attained the discrete dispersion.

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Section: Introductionsupporting

confidence: 78%

Delamination of Organically Modified Layered Filler via Solid‐State Processing

Saito

Okamoto

Hiroi

et al. 2006

Macromol. Rapid Commun.

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“…Though it is widely believed that the shear applied during the clay delamination is important, some recent findings suggest that this belief may be wrong. Saito et al [27,28] applied a solid-state processing method by using a compression molder without shear. The fine polymer powder and organically modified clay were pressed 10 times in the compression molder at a temperature below the melting point of the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Nylon 66/clay nanocomposite structure development in a twin screw extruder

Lin

Thümen

Heim

et al. 2009

Polymer Engineering & Sci

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Nylon 66/clay nanocomposites were prepared in a Berstorff ZE25A UTX Ultra-glide corotating twin screw extruder at 2708C. Two types of extruder configurations with different mixing sections were used. One comprised two kneading block sections in the screws (KB only) and the other had a combination of a multiprocess-element (MPE) section and a kneading block section. Samples at eight different locations along the extruder screw were obtained and analyzed using scanning electron microscope and transmission electron microscope to examine the morphology development of clay inside nylon down the length of the extruder. It is found that the clay aggregates are quickly broken into smaller tactoids (micron size) and then even much smaller clay bundles (nanometer size) and single clay platelets in the first mixing section. The structure changes in the second mixing section are much less significant. X-ray diffraction (XRD) analysis of the nanocomposite products showed small, or disappearance of, characteristic XRD (001) peaks, which indicates partial exfoliation, or complete exfoliation,

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“…Both factors control the packing and configuration of the onium ion modifier in the constrained gallery and consequently the height of the gallery. 24,25 Organoclays are normally formed through an ion-exchange reaction of the inorganic parent clay with the desired onium ion. The partial replacement of the inorganic cations by onium ions results in the segregation of the two types of cations into separate galleries, affording either an interstratified intercalate or a mixture of organic and inorganic clay phases.…”

Section: Characterization Of Mhtmentioning

confidence: 99%

Polymer Nanocomposite of Mg-Al Hydrotalcite-Type Anionic Clay Modified with Organosulfate

Yoon

Hwang²,

Noh

et al. 2007

Polym J

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The Mg-Al hydrotalcite (HT) was modified with organosulfate, sodium dodecylsulfate (SDS) by an anion exchange reaction. The modifier content and the interlayer distance of organo-modified HT (MHT) were examined. The modifier content and dspacing in HT layers increased up to 45% of AEC and 38.0 Å . Incorporation of the modifier in HT layers at pH 7 was easier than at pH 11, due to the higher concentration of anions in HT layers at pH 11 than at pH 7. Polystyrene(PS) and poly(methyl methacrylate)(PMMA) nanocomposites with the MHT were prepared by solution and melt blending, and in situ polymerization; an intercalation and partially exfoliation were obtained together with thin packets of HT layers. The partially exfoliated PMMA/MHT nanocomposites were obtained even at the 5 wt % MHT loading. The nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The mechanical properties of nanocomposites were also investigated.KEY WORDS: Mg-Al hydrotalcite / Organosulfate / Nanocomposite / PMMA / PS / Polymer/layered inorganic nanocomposites (PLN) have attracted great interest in the field of material chemistry because of their novel mechanical, thermal, and optical properties, 1-8 which are mainly attributed to the high degree of dispersion of layered inorganic compounds in the polymer matrix. A mass fraction of a few percent of reinforcing agent that is properly distributed in the polymer matrix creates significantly more surface area for polymer-filler interactions than do conventional composites.9 Among PLNs, exfoliated PLN materials usually have a molecular dispersion of high aspect ratio inorganic layers in polymer nanocomposites. 10Silicate clays such as montmorillonite, hectorite, and magadiite are the most common fillers used for the preparation of nanocomposites; they have a layered structure with 1 nm thickness and extremely high aspect ratios (e.g. 50-1000). 11Lately, a new emerging class of nanocomposites, based on anionic hydrotalcite (HT)-like clays, has been investigated.Anionic clays can be considered the opposite of silicate clays; positively charged sheets are stacked one on top of the other and intercalated by exchangeable anions and water molecules.12 HTs are positively charged due to the isomorphous substitution of bivalent cations by trivalent ones. The layers are intercalated with anions in order to balance the residual charge. One of the most important properties of the HT-type material is its high anionic exchange capacity related to its lamellar structure that allows the exchange of its original anions with those present in an aqueous solution.It is well known that HT-type compound belongs to the large class of natural and synthetic HT. HT have the generalxþ A x/z zÀ . mH 2 O, where M is a metal cation and A is an exchangeable anion. Typically LDH anion exchange capacities vary in the range of 200-470 mequiv/100 g and are higher than the corresponding cation exchange capacity of silicate clays like sodium montmorillo...

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Back Cover: Macromol. Mater. Eng. 11/2006

Abstract: Back Cover: Despite the immiscibility between octadecylammonium (ODA) and diphenyl sulfide (DFS), the layer expansion in montmorillonite-ODA takes place after mixing with DFS, indicating the DFS intercala-tion into nano-galleries.

Cited by 16 publications

References 0 publications

Delamination of Organically Modified Layered Filler via Solid‐State Processing

Delamination of Organically Modified Layered Filler via Solid‐State Processing

Nylon 66/clay nanocomposite structure development in a twin screw extruder

Polymer Nanocomposite of Mg-Al Hydrotalcite-Type Anionic Clay Modified with Organosulfate

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