Cover Picture: Macromol. Rapid Commun. 15/2004

Hiroi, Ryoichi; Ray, Suprakas Sinha; Okamoto, Masami; Shiroi, Takashi

doi:10.1002/marc.200490029

Cited by 21 publications

(27 citation statements)

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“…[40] For the same purpose, the addition of a layered titanate as nanofiller in the PLA matrix results in an enhanced rate of biodegradation under solar irradiation because of its photocatalytic reactivity, which is comparable to that of TiO 2 . [41] In this context, novel approaches based on clay-TiO 2 systems prepared by controlled deposition of TiO 2 nanoparticles on silicate surfaces can be envisaged.…”

Section: Green Bionanocompositesmentioning

confidence: 99%

Bionanocomposites: A New Concept of Ecological, Bioinspired, and Functional Hybrid Materials

2007

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Bionanocomposites represent an emerging group of nanostructured hybrid materials. They are formed by the combination of natural polymers and inorganic solids and show at least one dimension on the nanometer scale. Similar to conventional nanocomposites, which involve synthetic polymers, these biohybrid materials also exhibit improved structural and functional properties of great interest for different applications. The properties inherent to the biopolymers, that is, biocompatibility and biodegradability, open new prospects for these hybrid materials with special incidence in regenerative medicine and in environmentally friendly materials (green nanocomposites). Research on bionanocomposites can be regarded as a new interdisciplinary field closely related to significant topics such as biomineralization processes, bioinspired materials, and biomimetic systems. The upcoming development of novel bionanocomposites introducing multifunctionality represents a promising research topic that takes advantage of the synergistic assembling of biopolymers with inorganic nanometer‐sized solids.

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Section: Green Bionanocompositesmentioning

confidence: 99%

Bionanocomposites: A New Concept of Ecological, Bioinspired, and Functional Hybrid Materials

2007

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“…[4,5] The layer titanate (HTO) is a new nano-filler having high-surface charge density [4] compared with conventional layered silicates. Their names, chemical formula, and designations (as written in the text) are presented in Table 1.…”

Section: Experimental Partmentioning

confidence: 99%

“…[4,5] The nano-structure analyses of wide-angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM) were carried out using the same apparatus as in the previous articles. [3][4][5] Here we briefly describe molecular modeling of the intercalants. By aid of computer simulation, we proposed the molecular dimensions of two different intercalants using the molecular dynamics program (MM2 in Quantum CAChe, Fujitsu Ltd.) in consideration of van der Waals radi.…”

Section: Experimental Partmentioning

confidence: 99%

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Direct Melt Intercalation of Polylactide Chains into Nano‐Galleries: Interlayer Expansion and Nano‐Composite Structure

Yoshida

Okamoto

2006

Macromol. Rapid Commun.

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Summary: The polylactide‐based nano‐composites were prepared via melt extrusion method using different types of intercalants and nano‐fillers having different surface charge density. In order to understand the direct polymer melt intercalation into the nano‐galleries, the interdigitated layer structure of the organically modified layered filler (OMLF), where the intercalants are oriented with some inclination to the host layer in the interlayer space, was proposed. After polymer melt intercalation, the smaller initial interlayer opening led to the larger interlayer expansion, suggesting the large amount of the intercalation of the polymer chains. Consequently, the nano‐composite exhibited finer dispersion of the nano‐fillers when compared with the nano‐composites prepared from OMLFs with larger initial interlayer opening.Illustration of a model of interlayer structure of the qC14(OH) in gallery space of HTO.magnified imageIllustration of a model of interlayer structure of the qC14(OH) in gallery space of HTO.

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“…Very recently, Hiroi and Okamoto et al 86 first reported the photodegradability of neat PLA and corresponding Figure 34 shows the UV/VIS transmission spectra of pure PLA and nanocomposite (PLANC1 . 7).…”

Section: Photodegradationmentioning

confidence: 99%

Recent Advances in Polymer/Layered Silicate Nanocomposites: An Overview from Science to Technology

Okamoto¹

2006

Processing and Properties of Nanocomposites

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Polymer/layered silicate nanocomposites (PLSNCs) offer remarkably improved mechanical and other properties with low inorganic filler loading. The major development in this field has been carried out over the last one and a half decades. However, the authors are far from the goal in terms of understanding the mechanisms of the enhancement effect in the nanocomposites. Continued progress in nanoscale controlling and an improved understanding of the physicochemical phenomena at the nanometre scale have contributed to the rapid development of novel PLSNCs. The present paper describes recent advances in PLSNCs with the primary focus on these advances from basic science to technology.Keywords: Nanocomposite, Layered silicate Introduction A decade of research has shown that nanostructured materials have the potential to significantly impact growth at every level of the world economy in the twenty-first century. This new class of materials is now being introduced in structural applications, such as gas barrier film, flame retardant product and other load bearing applications (see Table 1). 1Of particular interest is recently developed nanocomposites consisting of a polymer and layered silicate (LS), because they often exhibit remarkably improved mechanical and other properties 2 when compared with pure polymer or conventional composites (both micro and macrocomposites). A primary progress in polymer/ layered silicate nanocomposites (PLSNCs), a nylon 6/LS hybrid 3 reported by Toyota Central Research & Development Co. Inc. (TCRD), was successfully prepared by in situ polymerisation of e-caprolactam in a dispersion of montomorrillonite (MMT). The silicate can be dispersed in liquid monomer or a solution of monomer. It has also been possible to melt and mix polymers with layered silicates, avoiding the use of organic solvents. The latter method permits the use of conventional processing techniques such as injection moulding and extrusion.Continued progress in nanoscale controlling and an improved understanding of the physicochemical phenomena at the nanometre scale have contributed to the rapid development of novel PLSNCs. The present paper describes current research on PLSNCs with the primary focus on recent advances from basic science to technology. Historical point of viewEarlier attempts of preparing polymer/LS composites are found in almost half a century old patent literatures. 4,5 In such cases, incorporation of 40-50 wt-% clay mineral (bentonite, hectorite, etc.) into a polymer was attempted but ended up with unsatisfactory results: the maximal modulus enhancement was only y200%, although the clay loading was as much as 50 wt-%. The failure was obvious, because they failed to achieve good dispersion of clay particles in the matrix, in which silicate minerals existed as agglomerated tactoids. Such a poor dispersion of the silicate particles could improve the material rigidity, but certainly sacrificing the strength, the elongation at break and the toughness of the materials. 4,5 A major reason for this impossibil...

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Cover Picture: Macromol. Rapid Commun. 15/2004

Abstract: Cover: The structure of pristine protonated layered titanate (HTO) (left) and the bright-field transmission electron microscopy image of a photodegradable nanocomposite (right) prepared by melt extrusion of polylactide and organically modified HTO are shown on the cover.

Cited by 21 publications

References 0 publications

Bionanocomposites: A New Concept of Ecological, Bioinspired, and Functional Hybrid Materials

Bionanocomposites: A New Concept of Ecological, Bioinspired, and Functional Hybrid Materials

Direct Melt Intercalation of Polylactide Chains into Nano‐Galleries: Interlayer Expansion and Nano‐Composite Structure

Recent Advances in Polymer/Layered Silicate Nanocomposites: An Overview from Science to Technology

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