In situ polymerization of tetraethoxysilane in polymers: chemical nature of the interactions

Landry, Christine J. T.; Coltrain, Bradley K.; Wesson, Jeffrey A.; Zumbulyadis, Nicholas; Lippert, Joseph L.

doi:10.1016/0032-3861(92)90127-i

Cited by 227 publications

(191 citation statements)

References 10 publications

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“…Among the polymers used to form sequential IPNs, those that give transparent hybrids are those capable of forming hydrogen bonds with hydroxylated SiO 2 particles. 40 Strong interactions between silanols, having the character of Brönsted acids, and specific groups on the polymer that are hydrogen acceptors, are responsible for the high degree of two-phase mixing.…”

Section: Sequential Organic/inorganic Interpenetrating Networkmentioning

confidence: 99%

“…These polymers are poly(N,N-dimethacrylamide), poly(2-methyl-2-oxazoline), poly(methyl methacrylate) (PMMA), polyvinylpyrrolidone (PVP), poly(acrylic acid) (PAA) and its copolymers, poly(vinyl acetate) (PVAc), and poly(vinyl alcohol) (PVA). [40][41][42][43] In detail, the properties of the hybrids are functions of the relative fractions of the polymer and TEOS in the sol-gel formulation, along with the chemistry and length of the polymer chain. When TEOS is polymerized in the presence of the polymer, the glass transition (T g ) of the polymer increases or becomes undetectable.…”

Section: Sequential Organic/inorganic Interpenetrating Networkmentioning

confidence: 99%

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Transparent Organic/Inorganic Hybrid Gels: A Classification Scheme

Wójcik

Klein

1997

Appl. Organometal. Chem.

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Section: Sequential Organic/inorganic Interpenetrating Networkmentioning

confidence: 99%

Section: Sequential Organic/inorganic Interpenetrating Networkmentioning

confidence: 99%

Transparent Organic/Inorganic Hybrid Gels: A Classification Scheme

Wójcik

Klein

1997

Appl. Organometal. Chem.

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“…1B and 1D, it can be seen that four extra peaks at 437, 463, 1086 and 1123 cm ¡1 appear in the spectrum of the latter. The peaks at 1086 and 1123 cm ¡1 indicate that the Si O C bond, which may be associated with an H-bonded Si OH group, is produced from the reaction between POE-g-AA and SiO 2 since absorbance of this covalent bond usually appears at 1080-1200 cm ¡1 (typically at 1080-1120 cm ¡1 ) [22,25,26]. It can also be found from the FT-IR spectra of POE-g-AA and POE-g-AA/SiO 2 (Fig.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…1C and 1D), an interesting trait associated with the silicate phase appeared in the limited 500-400 cm ¡1 range where it consists of a peak at about 437 cm ¡1 to the right of the peak assigned to Si O Si bending deformation at about 463 cm ¡1 . This feature, associated with partially condensed intermediates in polymerization of TEOS, can be identi ed as 525 cm ¡1 with Si (OSi) 2 species (Q 2 ), 484 cm ¡1 with Si (OSi) 3 species (Q 3 ) and 432 cm ¡1 with Si (OSi) 4 species (Q 4 ) [25,27]. To further understand the effect of silica content on this feature, the spectra in this limited range for POE-g-AA/SiO 2 hybrids having different amounts of silica were expanded and illustrated in Fig.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Polyethylene-octene elastomer/silica hybrids prepared by a sol-gel process using tetraethoxysiliane

Wu¹,

Liao²

2003

Designed Monomers and Polymers

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Abstract-In this study, new organic-inorganic hybrid composites were prepared by means of an in situ sol-gel process. The polymer used as the continuous phase was the metallocene polyethylene-octene elastomer (POE) or the acrylic acid grafted polyethylene-octene elastomer (POE-g-AA). The silica forming the inorganic phase was produced by the hydrolysis and condensation of tetraethoxysilane (TEOS) in polymers. Characterizations of POE-g-AA/ SiO 2 and POE / SiO 2 hybrids were performed by Fourier transform infrared (FT-IR) spectroscopy, 29 Si solid-state nuclear magnetic resonance (NMR) spectrometry,X-ray diffraction (XRD) spectroscopy, differentialscanning calorimetry (DSC), thermogravimetry analysis and Instron mechanical tester. We found that the POEg-AA/ SiO 2 hybrid could enhance the properties of the POE / SiO 2 hybrid, since the interfacial forces of the former are the covalent Si O C and hetero-associatedhydrogen bonds but the latter only has weaker hydrogen bonds. The result of 29 Si solid-state NMR spectra showed that Si atom coordination around SiO 4 units is predominantly Q 3 and Q 4 . It was also found that the POE-g-AA/ SiO 2 hybrid with 9 wt% SiO 2 gave the maximum value of tensile strength since excess particles might cause the separation between the organic and inorganic phases when the silica content was beyond this point.

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“…In their study no mechanical tests were performed, but another report by Landry et al showed that organic-inorganic materials prepared by the in situ polymerization of silanes (tetraethylorthosilicate TEOS) in polymers resulted in materials with enhanced mechanical properties [137]. This was attributed to the nature of the interactions between the two phases: the hydrogen bonds formed between the residual hydroxyls of the hydrolyzed TEOS molecules and the ones in the polymer, which acted as crosslinkers [138]. However, this kind of bonding is rather weak and is not stable in aqueous medium, as the water molecules may easily separate the chains [139].…”

Section: Hybrids Class Imentioning

confidence: 99%

Hybrid Organic-Inorganic Scaffolding Biomaterials for Regenerative Therapies

Sachot¹,

Engel²,

Castaño

2014

COC

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Abstract:The introduction of hybrid materials in regenerative medicine has solved some problems related to the mechanical and bioactive properties of biomaterials. Calcium phosphates and their derivatives have provided the basis for inorganic components, thanks to their good bioactivity, especially in bone regeneration. When mixed with biodegradable polymers, the result is a synergic association that mimics the composition of many tissues of the human body and, additionally, exhibits suitable mechanical properties. Together with the development of nanotechnology and new synthesis methods, hybrids offer a promising option for the development of a third or fourth generation of smart biomaterials and scaffolds to guide the regeneration of natural tissues, with an optimum efficiency/cost ratio. Their potential bioactivity, as well as other valuable features of hybrids, open promising new pathways for their usein bone regeneration and other tissue repair therapies. This review provides a comprehensive overview of the different hybrid organic-inorganic scaffolding bio-materials developed so far for regenerative therapies, especially in bone. It also looks at the potential for research into hybrid materials for other, softer tissues, which is still at an initial stage, but with very promising results.

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In situ polymerization of tetraethoxysilane in polymers: chemical nature of the interactions

Cited by 227 publications

References 10 publications

Transparent Organic/Inorganic Hybrid Gels: A Classification Scheme

Transparent Organic/Inorganic Hybrid Gels: A Classification Scheme

Polyethylene-octene elastomer/silica hybrids prepared by a sol-gel process using tetraethoxysiliane

Hybrid Organic-Inorganic Scaffolding Biomaterials for Regenerative Therapies

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