Characterization of Novel Epoxy Composites Based on Hybrid Inorganic/Organic Polyhedral Oligomeric Silsesquioxane

Constantin, Floriana; Gârea, Sorina Alexandra; Sandu, Teodor; Iovu, Horia

doi:10.1080/10236660903522148

Cited by 15 publications

(3 citation statements)

References 15 publications

(11 reference statements)

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“…From Figure 3(b), it may be observed that the temperature at which the polymerization enthalpy is maximum increases when POSS compound is added probably due to the restricted mobility of the UDMA chains in the vicinity of the POSS cages thus these chains being less available for the polymerization process 20…”

Section: Resultssupporting

confidence: 83%

The influence of POSS substituent on synthesis and properties of hybrid materials based on urethane dimethacrylate (UDMA) and various polyhedral oligomeric silsesquioxane (POSS)

Lungu

Sulca

Vasile

et al. 2011

J of Applied Polymer Sci

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DSC was used to follow the degree of conversion (DC) for the methacrylic groups in the case of some hybrid systems based on urethane dimethacrylate (UDMA) monomer and various polyhedral oligomeric silsesquioxane (POSS) structures (HISO‐POSS, CPENTYL‐POSS, and MA‐POSS). The chemical structure of the POSS compound directly influences the DC value. The conversion of the methacrylic groups from the hybrid composites after thermal curing was determined by measuring the residual heat of reaction. Both SEM and AFM techniques were additionally used to performed an advanced morphological characterization for the obtained POSS‐nanocomposites. The DSC data have been corroborated with those resulted from the NIR spectroscopy. The introduction of POSS compound within the UDMA matrix leads to a decrease of the hybrid material transparency due to the formation of agglomerates also pointed out by SEM analysis. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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Section: Resultssupporting

confidence: 83%

The influence of POSS substituent on synthesis and properties of hybrid materials based on urethane dimethacrylate (UDMA) and various polyhedral oligomeric silsesquioxane (POSS)

Lungu

Sulca

Vasile

et al. 2011

J of Applied Polymer Sci

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“…[1][2][3][4] In recent years, the enhanced characteristics of resultant hybrid materials enabled the development of innovative industrial applications in the areas of advanced ceramics, biosensors, protective coatings, and catalysts. [1][2][3][4] In recent years, the enhanced characteristics of resultant hybrid materials enabled the development of innovative industrial applications in the areas of advanced ceramics, biosensors, protective coatings, and catalysts.…”

Section: Introductionmentioning

confidence: 99%

Characterization of New Inorganic-Organic Composites Based on Mesoporous Silica and Vinyl Acetate

Ciripoiu

Sârbu

Damian

et al. 2012

International Journal of Polymer Analysis and Characterization

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New polymer composites were synthesized by a new approach: radical polymerization in an ultrasonic field of the vinyl acetate inside the silica pores. The systems were extensively characterized by different techniques: X-ray photoelectron spectroscopy (XPS), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), derivative thermogravimetry (DTG), dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM). The formation of hybrid materials was proved by XPS. The molecular weight of the entrapped polymer in the cavities of the inorganic structure was assessed by GPC. The thermal properties of the composites were determined by TGA/DTG and DMA.

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“…Another thermal technique, DSC, was successfully used in other recent studies [48][49][50][51][52][53][54]. In one of them [52], Ruela et al prepared some MIPs with possible application in nicotine delivery systems, and the DSC analysis showed that the polymer decomposes at *400°C, meaning that the MIPs have a high thermal stability.…”

Section: Introductionmentioning

confidence: 97%

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

Dima

Nicolae

Iordache

et al. 2015

J Therm Anal Calorim

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Thermogravimetric analysis (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis, simultaneous differential thermogravimetry (SDT) coupled with mass spectrometry (MS), and pyrolysis coupled with gas chromatography/mass spectrometry (Py-GC/MS) were used to characterize molecularly imprinted polymers (MIPs) obtained with two anti-cancerous template molecules, diosgenin and sclareol, imprinted in acrylonitrileacrylic acid copolymer matrices. First of all, TG analyses revealed a specific mass loss in the temperature range 220-300°C characteristic to diosgenin-MIPs, while for the sclareol-MIPs, the specific interval was 100-240°C. Further, the DSC analyses evidenced two major aspects: first, that the copolymer matrices have a single glass transition temperature (T g ), which confirms the random statistic copolymer structure, an essential characteristic of a homogenous MIP matrix; secondly, both templates influence the T g values of the MIPs, fact that is an additional proof of molecular imprinting. The SDT results confirmed the TG and DSC results and, additionally, proved that the system with higher acrylic acid content generates stronger template-matrix interactions via hydrogen, van der Waals, and other non-covalent forces, fact that appears as an increased thermal stability on the TG curve and a higher maximum for template decomposition on the DTG curve. The MS results evidenced that a single mass fragment, 139 ± 1 m/z, characteristic for the class of steroid sapogenines of which diosgenin belongs, is enough to prove, qualitatively and quantitatively, the molecular imprinting and the template elution. As global conclusion, the applied thermal analyses proved to be exceptional tools for analyzing these molecularly imprinted polymers.

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Characterization of Novel Epoxy Composites Based on Hybrid Inorganic/Organic Polyhedral Oligomeric Silsesquioxane

Cited by 15 publications

References 15 publications

The influence of POSS substituent on synthesis and properties of hybrid materials based on urethane dimethacrylate (UDMA) and various polyhedral oligomeric silsesquioxane (POSS)

The influence of POSS substituent on synthesis and properties of hybrid materials based on urethane dimethacrylate (UDMA) and various polyhedral oligomeric silsesquioxane (POSS)

Characterization of New Inorganic-Organic Composites Based on Mesoporous Silica and Vinyl Acetate

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

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