Architecture of Silsesquioxanes

Dirè, Sandra; Borovin, Evgeny; Ribot, François

doi:10.1007/978-3-319-19454-7_119-1

Cited by 7 publications

(11 citation statements)

References 139 publications

(155 reference statements)

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“…This confirmed the polycondensation and formation of a ladder-structured inorganic siloxane backbone. It was reported that an alkali catalyst favoured the formation of ladder-structured siloxane, and the results were in agreement with previous studies [22,67,68]. A shift in the peak from 980 cm −1 to 987 cm −1 in both the resins confirmed the presence of Si-O-Ca in the network.…”

Section: Characterization Of Resinssupporting

confidence: 92%

Novel Bone Void Filling Cement Compositions Based on Shell Nacre and Siloxane Methacrylate Resin: Development and Characterization

Wilson,

Philipose Pampadykandathil

2023

Bioengineering

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Shell nacre from Pinctada species has been extensively researched for managing bone defects. However, there is a gap in the research regarding using shell nacre powder as a cement with improved biological and physicochemical properties. To address this, bone void filling cement was formulated by incorporating shell nacre powder and an organically modified ceramic resin (ormocer). The shell nacre powder was specifically processed from the shells of Pinctada fucata and analysed using thermogravimetric analysis (TGA), X-ray diffraction spectroscopy, Fourier transform infrared (FTIR), and Raman spectroscopy, confirming the presence of organic constituents and inorganic aragonite. Trace element analysis confirmed the eligibility of shell nacre powder for biomedical applications. Next, the ormocer SNLSM2 was synthesized through a modified sol–gel method. FTIR, Raman, TGA, and transmission electron microscopy studies revealed the presence of a ladder-structured siloxane backbone and methacrylate side chain. To develop chemical curable composite shell nacre cement (SNC), different amounts of shell nacre (24%, 48%, and 72%) were added to the SNLSM2 resin, and the impact on the physicochemical properties of the cement was studied. Among the compositions, SNC 72 exhibited significantly lower linear polymerization shrinkage (0.4%) and higher compressive (>100 MPa) and flexural strength (>35 MPa). SNC 72 was radiopaque, and the exotherm generated during the cement curing was minimal. Cytotoxicity studies with L929 cells revealed the non-cytotoxic nature of the cement. Overall, the findings of this study prove that the shell nacre cement is a promising candidate for managing bone voids.

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Section: Characterization Of Resinssupporting

confidence: 92%

Novel Bone Void Filling Cement Compositions Based on Shell Nacre and Siloxane Methacrylate Resin: Development and Characterization

Wilson,

Philipose Pampadykandathil

2023

Bioengineering

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“…The small NMR peaks centered at chemical shift −71.82 are assigned to T 2 units, and the major peak centered at −85.24 is attributed to T 3 units 24,25 . The high intensity of this peak, shown in Figure 3b, is clear evidence that T 3 is the major component of SQVH‐12.…”

Section: Resultsmentioning

confidence: 94%

Vinylhydridosilsesquioxne: Synthesis and characterization of a potential filler material for vinyl‐containing polysiloxanes

Yesudas,

Sreejith,

Vijay

2023

J of Applied Polymer Sci

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This paper reports the synthesis and characterization of an organic silsesquioxane (SQ) containing Sivinyl and SiH groups named as vinylhydridosilsesquioxane (SQVH‐12). Detailed investigation of the structure of this organosilsesquioxane revealed that SQVH‐12 has a highly cross‐linked (polycyclic) SiO network of silsesquioxane with Sivinyl and SiH functional groups. Thermogravimetric analysis of the pyrolysis behavior of SQVH‐12 yielded a high percentage of ceramic residue (~92%) at 1200°C under an argon atmosphere. The presence of functional groups in SQVH‐12 and the high rate of ceramic residue highlights the potential usefulness of SQVH‐12 as a filler for vinyl‐containing polysiloxanes. Thus, further research of SQVH‐12 can find applications in a wide variety of areas such as additive manufacturing, protective coatings, and advanced composites.

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“…The change in the character of the absorption bands in the 1200–1000 cm −1 region confirms the occurrence of the condensation process. The strong broad band in this region, resulting from the stretching vibrations of the Si–O–Si bond, demonstrates the presence of different structural species of silsesquioxane [ 52 , 53 ]. In particular, the 1119 cm −1 band is assigned to the symmetrical cage structure.…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Soluble Polysilsesquioxane with Phthalimide Groups

Emel’yanov,

Bolgova,

Trofimova

et al. 2023

IJMS

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Soluble polysilsesquioxane containing side-chain phthalimide groups (PSQ-PhI) was synthesized via a solvent- and catalyst-free hydrolytic polycondensation reaction using 2-[3-(triethoxysilyl)propyl]-1H-isoindole-1,3(2H)-dione. The composition and structure of polysilsesquioxane was confirmed via 1H, 13C, and 29Si NMR spectroscopy, Fourier transform infrared spectroscopy, gel permeation chromatography, thermogravimetric analysis, dynamic light scattering, X-ray diffraction analysis, and elemental analysis. The synthesized silsesquioxane showed a monomodal molecular weight distribution. The average molecular weight of polysilsesquioxane is 11,200 Da, and the polydispersity index is 1.10. 29Si NMR analysis showed a half-peak width w1/2 3.1 ppm at δ −68.3, which corresponds to the PhI(CH2)3SiO3/2 unit and indicates an ordered structure in the polymer, with some defects caused by the presence of uncondensed silanol groups. PSQ-PhI showed good thermal stability (Td5% decomposition at 345 °C). The polysilsesquioxane-based coating was transparent in the visible region.

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Architecture of Silsesquioxanes

Cited by 7 publications

References 139 publications

Novel Bone Void Filling Cement Compositions Based on Shell Nacre and Siloxane Methacrylate Resin: Development and Characterization

Novel Bone Void Filling Cement Compositions Based on Shell Nacre and Siloxane Methacrylate Resin: Development and Characterization

Vinylhydridosilsesquioxne: Synthesis and characterization of a potential filler material for vinyl‐containing polysiloxanes

Green Synthesis of Soluble Polysilsesquioxane with Phthalimide Groups

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