Geomaterials: their application to environmental remediation

Yamada, Hirohisa; Tamura, Kenji; Watanabe, Yujiro; Iyi, Nobuo; Morimoto, Kazuya

doi:10.1088/1468-6996/12/6/064705

Cited by 30 publications

(18 citation statements)

References 122 publications

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“…[3] Some organic additives called light stabilizers could be used to prevent the photodegradation of the polymer. [5,6] Hydrotalcite-like compounds, also known as "anionic clays" or "layered double hydroxides", can endow the UVshielding property quite easily. [4] However, their incorporation directly into the polymer leads to several drawbacks: the possible reaction of the organic molecule directly with the polymer, thereby leading to the scission of its chain and diffusion of the additive out of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…The use of a nanocontainer that features a large aspect ratio, in addition to suppressing degradation, might prevent migration and subsequent creation of porosity within the polymer network as well as its leaching out of the polymer. Organic–inorganic hybrids based on clay minerals such as smectites, sepiolites or layered double hydroxides have been used as building blocks for assembling organic molecules in nanostructured materials 5,6…”

Section: Introductionmentioning

confidence: 99%

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Inorganic–Organic Hybrid Materials Based on Amino Acid Modified Hydrotalcites Used as UV‐Absorber Fillers for Polybutylene Succinate

et al. 2012

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Polybutylene succinate (PBS)‐functionalized nanocomposites with amino acid tyrosine (TYR)‐ and tryptophan (TRY)‐hybrid‐interleaved layered double hydroxide (LDH) materials exhibit interesting anti‐UV properties and rheological properties. Embedding amino acid into the layered double hydroxide container preserves the UV shielding property of the pristine organic molecule. When employed in an aliphatic polymer such as PBS, chain scission occurs during photoageing and accelerates the degradation of the raw material. However the embedded inorganic amino acid melt blended with PBS prevents such degradative phenomenon. An investigation of their structure–property relationship (i.e., nonmiscibility and expanded PBS nanocomposite structures) was conducted. The nonmiscible structure observed for LDH‐TYR was found to be associated with a chain‐extender behaviour, whereas the interleaved structure of PBS‐LDH‐TRY yielded a liquid–gel transition. Both PBS nanocomposite structures were found to be stable under agressive UV conditions, whereas amino acid free of an LDH container resulted in a deleterious effect when dispersed in PBS, largely promoting PBS chain scission. Hence amino acid organically modified hydrotalcites appear to hold promise for use as UV absorbers when dispersed into other aliphatic biodegradable polymers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inorganic–Organic Hybrid Materials Based on Amino Acid Modified Hydrotalcites Used as UV‐Absorber Fillers for Polybutylene Succinate

et al. 2012

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“…Nanocomposites have been used as adsorbents and decoloration agents to remove heavy metals, phenols and other micro pollutants from water [5]. They are utilized as thickeners in paints and in oil drilling fluids [6,7]. They have better mechanical strength, dimensional stability, thermal stability, barrier and rheological properties compared with either polymer or clay alone [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Type and Amount of Quaternary Salts on Modification of Çanakkale Bentonite

Vargün¹,

Küçükuysal²,

Evren³

et al. 2017

Mugla Journal of Science and Technology

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The improved dispersion of clay minerals has an essential role for polymer clay nanocomposite manufacturing. In this regard, different organomodifications of clay have been attempted to obtain intercalated/exfoliated structures of composites. In present study, Çanakkale bentonite was organically modified by four different quaternary ammonium salts: tetramethylammonium chloride (TMAC), hexadecylpyridinium chloride (HDPC), hexadecyltrimethylammonium bromide (HDAB), phenyltrimethylammonium chloride (PMAC). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis and thermogravimetric analysis (TGA) were performed to characterize the organobentonites. The results revealed that there is an increment of basal spacing of bentonite with HDAB and HDPC salts from 14.9 Å to 20.7 Å and 21.4 Å, respectively. However, other modifiers cannot lead to significant changes in d-spacings.

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“…Layered silicates and carbon nanotubes have been widely used for modification of broad range of thermoplastics, both, synthetic (generally, polyolefines , polyamides , and aromatic polyesters ) and biodegradable (generally, modified starch , and polylactic acid ) ones in the areas like building/construction , automotive , energetics , packaging , cosmetics/medicine , environmental engineering , and others.…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimental investigations of elastic and creep properties of thermoplastic polymer nanocomposites

et al. 2015

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The study is devoted to prediction of elastic and creep properties of thermoplastic polymer nanocomposites reinforced with anisodiametric nanoadditives (either carbon nanotubes, CNTs, or montmorillonite clay, MMT) by considering structural hierarchy of the nanocomposites and the nanofillers itself. The nanocomposites analysed have been based on both synthetic and biodegradable thermoplastic polymer matrices (polyethylene, PE, and plasticized starch, PS, respectively) with potential applications in packaging, building/construction and energetics. It has been demonstrated that modulus of elasticity, stress at break as well as stress at yield of the investigated polymer nanocomposites significantly increase upon introduction of a minor amounts of the aforementioned nanofillers into the polymer matrices. Gain in the modulus of elasticity of the investigated PS based nanocomposites has been described by applying the algorithm of stage-by-stage calculation of the elastic constants of the multiphase-systems containing anisodiametric plate-like nanoparticles with complex structure. Change of the modulus of elasticity of the investigated PE based nanocomposites has been described by applying the theoretical model based on micromechanics approach in consideration of distribution quality of CNTs within the polymer matrix. Creep resistance of neat PE and its nanocomposites in the investigated time frame has been described according to the Findley power law, in spite of the fact, that addition of CNTs increases creep rate to some extent, being the consequence of the nanofiller effect on both crystallinity degree of the polymer matrix as well as viscoelastic properties in the interfacial regions.

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Geomaterials: their application to environmental remediation

Cited by 30 publications

References 122 publications

Inorganic–Organic Hybrid Materials Based on Amino Acid Modified Hydrotalcites Used as UV‐Absorber Fillers for Polybutylene Succinate

Inorganic–Organic Hybrid Materials Based on Amino Acid Modified Hydrotalcites Used as UV‐Absorber Fillers for Polybutylene Succinate

The Effects of Type and Amount of Quaternary Salts on Modification of Çanakkale Bentonite

Modeling and experimental investigations of elastic and creep properties of thermoplastic polymer nanocomposites

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