Modification of sepiolite by treatment with methyl triethoxysilane

Jia, Demin; Liu, Jinquan; Xing-fang, Yao; Wang, Yulin

doi:10.1007/bf02838361

Cited by 12 publications

(7 citation statements)

References 9 publications

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“…Figure 3 gives the details of FTIR spectra of the pristine SEP and modified SEP samples which are modified with SMA-1000 (SEP-1000) and modified with SMA-EF40 (SEP-EF40). The bands at 3655 and 3564 cm −1 are assigned to the Mg-OH groups [38], the broad band at 3404 and the peak at 1464 cm −1 show O-H band stretching vibrations of zeolitic water, the peak at 1648 cm −1 is due to the stretching vibration of coordinated bonded water in SEP [35]. The band appeared at 1209 and 975 cm −1 are associated with Si-O bending and Si-O-Si stretching vibration, respectively [39].…”

Section: Structural Analysis Of the Modified Nanoclaysmentioning

confidence: 99%

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Surface Modification of Nanoclays with Styrene-Maleic Anhydride Copolymers

Arat¹,

Uyanık²

2017

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This study presents the modification of surfaces of nanoclays, halloysite nanotubes (HNT) and sepiolite (SEP), with styrene-maleic anhydride copolymers (SMA) via esterification reaction between hydroxyl groups of the nanoclays and anhydride groups of SMA. The structural, thermal, and morphological analyses of the modified nanoclays were performed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), thermal gravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM). All of these results suggested that the expected modification of HNT and SEP surfaces were performed. Although XRD patterns of HNT containing samples showed that the basal spacing shifted to higher distances, it was found that those of the crystalline structure of SEP remained unchanged. Thermal gravimetric analysis exhibited that SMA copolymers were grafted onto the surfaces of nanoclays varying amounts between 15 and 43 wt. % depending on the types of nanoclays and SMA copolymers. This modification indicates that these nanoclays can be added to the polystyrene matrix without any compatibilizers.

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Section: Structural Analysis Of the Modified Nanoclaysmentioning

confidence: 99%

“…They found that the modified HNT showed much lower polarity compared to pristine HNT and increased the mechanical properties compared with neat PP and PP/pristine HNT nanocomposites [32]. studied grafting reaction of methyltriethoxysilane on SEP surfaces to investigate the reactivity of silanol groups [35].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanoclays with Styrene-Maleic Anhydride Copolymers

Arat¹,

Uyanık²

2017

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“…3A, band extending from 3690 cm -1 to 3417 cm -1 are representing the stretching (symmetric and asymmetric) of OH groups and vibration at 1660 cm -1 is representing OH bending vibrations. Vibrations towards the lower wavenumbers are indicating Si-O-Si and Si-OMg linkages [15]. Fig.…”

Section: Impact Of Monomer Concentration (Emulsion Graft Polymerization)mentioning

confidence: 99%

“…The silanol groups (Si-OH) are exposed at the marginal surface of nanofibers due to the periodic upside down inversion of tetrahedral sheets [12,13]. These silanol groups are easily accessible to numerous organic coupling agents for surface functionalization [14,15]. Recently vinyl functionalized 125-2 sepiolite has been used as a promising substrate to graft acrylonitrile on it [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Clays are considered as low-cost, non-hazardous and ubiquitous nanoscale materials [12]. CPNs have come to light as elegantly designed materials due to their significant properties and widespread applications in almost every field [13][14][15]. Sepiolite is a 2:1 type nanofibrous clay containing structural blocks which alternate with structural cavities called as tunnels and channels.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Polystyrene Grafted Nanohybrids by Graft Polymerization

Taimur¹,

Yasin²,

Bibi³

2018

International Conference of Theoretical and Applied Nanoscience and Nanotechnology

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-Novel polystyrene grafted sepiolite nanohybrid material (SPS) has been synthesized by using two different but greener routes i.e. simultaneous radiation grafting (bulk grafting) and emulsion graft polymerization. In case of simultaneous radiation grafting, influence of absorbed dose and monomer concentration were studied whereas for emulsion graft polymerization, outcome of monomer quantity was investigated. The grafting yield (GY) was measured by gravimetric analysis. The grafting of polystyrene chains was verified by Fourier transform infrared spectroscopy (FT-IR). The structural and morphological studies of synthesized nanohybrids have been explored by X ray diffraction (XRD) and field emission-scanning electron microscopy (FESEM) respectively. The grafting yield by simultaneous radiation grafting and emulsion graft polymerization was found to be 257 % and 85 % respectively. Transmission electron microscope (TEM) images evidently revealed the shortening of sepiolite nanofibers after silanization due to which heterogeneous nucleation occurred in micelles in emulsion graft polymerization. Results showed that simultaneous radiation grafting was comparatively better technique for grafting polystyrene chains onto silanized sepiolite.

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