Organosilane-functionalized halloysite for high performance halloysite/heterophasic ethylene–propylene copolymer nanocomposites

Bischoff, Eveline; Daitx, Tales S.; Simon, Douglas Alexandre; Schrekker, Henri Stephan; Liberman, Susana Alcira; Mauler, Raquel Santos

doi:10.1016/j.clay.2015.04.020

Cited by 38 publications

(13 citation statements)

References 42 publications

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“…In addition, the overall mass loss on silanized HNT is slightly higher then unmodified HNT. This is due to thermal decomposition of organic compounds in GLYMO, grafted to HNT (Bischoff et al, 2015;Krishnaiah et al, 2017), thus giving evidence of the efficiency of the silanization process. With regard to the caffeic acid-loaded HNT, it can be also detected a decrease in the first mass loss step, thus indicating an increase in hydrophilic properties of HNT.…”

Section: Effect Of Chemical Modification Of Hntmentioning

confidence: 99%

Improvement of mechanical and thermal properties of poly(3-hydroxybutyrate) (PHB) blends with surface-modified halloysite nanotubes (HNT)

Garcia‐Garcia

Fombuena

López‐Martínez

et al. 2018

Applied Clay Science

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The effect of two hydrophobic treatments on the hydrophilic nature of halloysite nanotubes (HNT) was studied in this research work: a silanization with (3-glycidyloxypropyl) trimethoxysilane (GLYMO) and a surface treatment with a natural aromatic compound, i.e. caffeic acid (CA). In addition, the effect of 3 wt% of unmodified HNT, silanized HNT (HNTSIL) and caffeic acid-modified HNT (HNTCA) on mechanical, thermal and morphological properties of a binary blend of poly(3-hydroxybutyrate) (PHB) and poly(-caprolactone) (PCL) with a weight ratio of 75/25, respectively was evaluated. These blends and their corresponding composites with HNT were partially compatibilized by reactive extrusion with dicumyl peroxide (DCP) and further processed by injection molding. The effectiveness of the surface treatments on HNT was followed by Fourier transformed infrared spectroscopy (FTIT), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and contact angle measurements. The obtained results suggested a clear hydrophobizing effect of both surface treatments on HNT but the hydrophobic nature the caffeic acid treatment can provide to HNT is greater than silanization. FESEM study on HNT-loaded PHB/PCL blends showed increased compatibility between modified-HNT and the polymeric matrix, as well as a better particle dispersion. In particular, 3 wt% HNTCA lead to an increase in tensile strength and elongation at break of 11.4% and 74%, respectively, with regard to composites with unmodified HNT. In addition, thermal analysis, evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), revealed a decrease in the melt peak temperature of 6.5ºC for composites with 3 wt% HNTCA as well a delay in the onset degradation temperature, thus leading to a broader processing window which enhances PHB processing by conventional techniques.

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Section: Effect Of Chemical Modification Of Hntmentioning

confidence: 99%

Improvement of mechanical and thermal properties of poly(3-hydroxybutyrate) (PHB) blends with surface-modified halloysite nanotubes (HNT)

Garcia‐Garcia

Fombuena

López‐Martínez

et al. 2018

Applied Clay Science

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“…In this case, the available OH groups present in the structure or from the broken bonds on the clay mineral edges are used for chemical modification through hydrolysis and condensation process (Piscitelli et al, 2010;Yuan et al, 2008). The silylation process depends on the reactivity of clay mineral surfaces, characteristics of silane, and the reaction conditions (Bischoff et al, 2015;He et al, 2013). The least reactive surface found on clay minerals under ambient conditions is the neutral siloxane surface that occurs, for example, on the Si-tetrahedral side of 1:1 kaolin group minerals.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…As the nanoparticles were not dried before modification, the physically adsorbed water on its surface may have promoted the complete hydrolysis of the organosilane and its condensation with the others previously grafted, thus forming a crosslinked structure. Moreover, a oligomerization-dominant modification is likely to be yielded since ethanol was used as solvent and, in this condition, APTES is very readily to hydrolyze (Bischoff et al, 2015;Yuan et al, 2008). Table 1 presents the DSC and TGA results of PHBV nanocomposites.…”

Section: Morphologymentioning

confidence: 99%

Effects of the organic modification of different clay minerals and their application in biodegradable polymer nanocomposites of PHBV

Daitx¹,

Carli²,

Crespo³

et al. 2015

Applied Clay Science

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“…The procedure used to functionalize the surface of CNCs was adapted from the methods applied by Bischoff et al (2015) to chemically modify halloysite nanotubes. [31] CNCs were modified using the bifunctional organosilanes (Gelest, USA) shown in Figure 1.…”

Section: Chemical Modification Of Cellulose Nanocrystals (Cncs)mentioning

confidence: 99%

Cellulose Nanocrystals‐Based Polyacrylamide as Flocculating Agent of Mature Fine Tailings

Nogueira

Silva

Soares

2020

Macromolecular Symposia

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This study compares the performance of neat polyacrylamide (PAM) and their nanocomposites produced with cellulose nanocrystals (CNCs) on the flocculation of mature fine tailings (MFT). The surface of CNCs is chemically modified using three different bifunctional organosilanes containing vinyl functional groups (7‐octenyl trimethoxysilane, methacryloxypropyl trimethoxysilane, vinyl trimethoxysilane). Acrylamide is polymerized in the absence and presence of pristine and silylated CNCs (5 and 10%w/w) to in situ produce PAM‐CNC nanocomposites. Concentrations of 1000 and 2000 ppm of the produced polymers are used to flocculate MFT. FTIR spectra showed that the CNCs are successfully modified, regardless of the silane used. The dynamics of floc size evolution is assessed by focused beam reflectance measurements (FBRMs), and the results demonstrated that smaller flocs are produced by increasing the CNCs content in the polymerization. Capillary suction times (CSTs) data showed that the use of CNC‐based PAM nanocomposites enhances flocs dewaterability in comparison to neat PAM. Moreover, the type of silane used in the chemical modification of CNCs influenced the flocculation performance of PAM‐CNC nanocomposites. The obtained results are promising and encourage the development of a more detailed investigation regarding the production and performance assessment of hybrid flocculating polymers composed by PAM and CNCs.

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Organosilane-functionalized halloysite for high performance halloysite/heterophasic ethylene–propylene copolymer nanocomposites

Cited by 38 publications

References 42 publications

Improvement of mechanical and thermal properties of poly(3-hydroxybutyrate) (PHB) blends with surface-modified halloysite nanotubes (HNT)

Improvement of mechanical and thermal properties of poly(3-hydroxybutyrate) (PHB) blends with surface-modified halloysite nanotubes (HNT)

Effects of the organic modification of different clay minerals and their application in biodegradable polymer nanocomposites of PHBV

Cellulose Nanocrystals‐Based Polyacrylamide as Flocculating Agent of Mature Fine Tailings

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