Octaepoxysilsesquioxane Cured by Different Curing Agents

2011 ◽  
Vol 84-85 ◽  
pp. 519-523
Author(s):  
Zeng Ping Zhang ◽  
Guo Zheng Liang ◽  
Shuan Fa Chen
Keyword(s):  
Fourier Transforms ◽  
Condensation Reaction ◽  
Excellent Thermal Stability ◽  
Inorganic Hybrid ◽  
Hydrolysis And Condensation ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Curing Agents ◽  
Oligomeric Silsesquioxane ◽  
Epoxy Groups

Polyhedral oligomeric silsesquioxane (POSS) can be used to prepare organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) containing eight reactive epoxy groups in a molecule was synthesized through the hydrolysis and condensation reaction of γ-[(2,3)-epoxypropoxy] propyltrimethoxysilicane. In this study, E-POSS was cured with 4,4'-Diaminodiphenylsulfone diamine (DDS) and methylnadic anhydride (MNA) , respectively. The curing reactions for both systems were monitored by Fourier transforms infrared spectroscopy (FT-IR). And the thermal properties of the cured systems were studied by Thermogravimetric analysis (TGA). The disappearance of the epoxy groups showed that either DDS or MNA was able to cure E-POSS into an organic-inorganic hybrid system with excellent thermal stability.

Characterization and Evaluation of Ca/Al LDHs Adsorbents Synthesized by a One-Step Hydrothermal Method for Congo Red Removal

2020 ◽  
Vol 977 ◽  
pp. 195-200
Author(s):  
Hong Tham Thi Nguyen ◽  
Dao Thi To Uyen ◽  
Duy Chinh Nguyen ◽  
Van Thuan Tran ◽  
Tri Duc Lam ◽  
...  
Keyword(s):  
Congo Red ◽  
Fourier Transforms ◽  
X Ray Diffraction ◽  
Anionic Dyes ◽  
One Step ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Hydrothermal Approach ◽  
Double Hydroxide ◽  
Hydrolysis Of

We investigated the fabrication of Ca/Al layered double hydroxide (LDHs) via a one-step hydrothermal approach with slow hydrolysis of urea at a low temperature without further annealing required. The as-synthesized Ca/Al LDHs nanostructures obtained were defined using Fourier transforms infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results demonstrated that Ca/Al LDHs exhibit excellent adsorption performance on Congo red anionic dyes in aqueous solution. The adsorption capacity of the Ca/Al LDHs toward Congo red was found to be 59.41 mg/g.

Determination of the Curing Techniques of Octaepoxysilsesquioxane with a Diamine

2012 ◽  
Vol 549 ◽  
pp. 157-160
Author(s):  
Zeng Ping Zhang ◽  
Jian Zhong Pei ◽  
Chang Qing Fang ◽  
Shuan Fa Chen
Keyword(s):  
Differential Scanning Calorimetry ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Resin System ◽  
Scanning Calorimetry ◽  
Curing Agents ◽  
Oligomeric Silsesquioxane ◽  
Epoxy Groups

Octaepoxysilsesquioxane (POSS-Ep), a kind of functional polyhedral oligomeric silsesquioxane (POSS) was cured with 4,4'-diaminodiphenylsulfone diamine (DDS) in this study. Possessing epoxy groups, it can be cured thermally with certain curing agents including amines. Differential scanning calorimetry (DSC) was used to determine the curing techniques of the POSS-Ep/DDS resin system in this study. The appropriate curing technique for this resin is set as: 130°C/2h+ 160°C/2h+200°C/2h.

scholarly journals Study of the Biodegradation of PLA/PBAT Films after Biodegradation Tests in Soil and the Aqueous Medium

2021 ◽  
Vol 12 (1) ◽  
pp. 833-846
Keyword(s):  
Contact Angle ◽  
Aqueous Medium ◽  
Visual Analysis ◽  
Fourier Transforms ◽  
Scanning Calorimetry ◽  
Thermal Compression ◽  
Hydrophilic Character ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Biodegradation In Soil

The intense consumption of conventional plastics has been generating a series of problems for nature due to the accumulation of municipal solid waste because of its difficult degradation. Therefore, the use of biodegradable polymers becomes a good option to minimize these effects. Poly (lactide acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) is a biodegradable blend that can be used mainly in applications that have a short shelf life. So, it is important to know the total biodegradation time of this blend. For this reason, PLA/PBAT films (1.5 x 1.5 x 0.15 cm) were produced by thermal compression molding to be subjected to biodegradation tests in soil and aqueous medium for 180 days. The films were characterized by visual analysis, weight loss measurements, differential scanning calorimetry (DSC), Fourier transforms infrared spectroscopy (FT-IR), contact angle, and scanning electron microscopy (SEM). DSC showed an increase of 0.7% in PLA crystallinity subjected to the aqueous medium, while FT-IR showed a reduction in the bands at 1710 cm-1 and 1100 cm-1, as a result of hydrolysis for both methodologies. The blend's hydrophilic character was increased after both degradation processes, presenting a reduction of 34.5% in the contact angle after biodegradation in soil. From the results, it was possible to conclude that PLA/PBAT films did not degrade completely, as expected, but showed signs that indicated the beginning of the degradation. The degradation was more effective in the aqueous medium.

scholarly journals Acid Treatment Halloysite Nanoclay: Eco-Friendly Heterogeneous Catalyst for the Synthesis of Pyrrole Derivatives

Proceedings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 17
Author(s):  
Ali Maleki ◽  
Zoleikha Hajizadeh
Keyword(s):  
Infrared Spectroscopy ◽  
Acid Treatment ◽  
High Efficiency ◽  
Fourier Transforms ◽  
Halloysite Nanotubes ◽  
Hydroxyl Groups ◽  
Simple Method ◽  
Pyrrole Derivatives ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy

In this study, halloysite nanotubes (HNTs) as a green and available nano-mineral were used. The hydroxyl groups of HNTs were increased by acid treatment. So, the efficiency of HNTs was improved. The catalyst application of acid treatment HNTs was investigated in the synthesis of pyrrole as an important heterocycle compound. The catalyst was characterized by Fourier transforms infrared spectroscopy (FT-IR). Easy and simple method, high efficiency and eco-friendly are the advantages of this report.

scholarly journals Polydimethylsiloxane and Castor Oil Comodified Waterborne Polyurethane

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xuan Ji ◽  
Yanming Zhou ◽  
Baoling Zhang ◽  
Caiying Hou ◽  
Guozhang Ma
Keyword(s):  
Thermal Stability ◽  
Castor Oil ◽  
Water Resistance ◽  
Fourier Transforms ◽  
Protective Coatings ◽  
Average Particle Size ◽  
Waterborne Polyurethane ◽  
Average Particle ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy

In view of both improving properties of waterborne polyurethane (WPU) and sufficient utilization of renewable resources, a series of polydimethylsiloxane (PDMS) and castor oil (C.O.) comodified anionic WPUs with internal cross-linking was prepared through a prepolymer mixing process. The chemical structure of synthesized polymers was characterized by Fourier transforms infrared spectroscopy (FT-IR). In comparison with traditional linear WPU synthesized from petroleum-based polyols, these novel WPU films exhibited superior properties in solvent and water resistance, thermal stability, and mechanical strength, which suggest promising applications of these new environmentally friendly materials, particularly in the area of decorative and protective coatings. In addition, the results showed that with the increase in PDMS content in these co-modified WPUs the average particle size, the water resistance, and the thermal stability increased accordingly while the solvent resistance and the mechanical properties decreased.

Curing Behavior and Thermal Properties of Me-SSQ/Cyanate Ester Resin Organic-Inorganic Hybrids

2011 ◽  
Vol 228-229 ◽  
pp. 83-87
Author(s):  
Zeng Ping Zhang ◽  
Shuan Fa Chen ◽  
Jian Zhong Pei
Keyword(s):  
Thermal Properties ◽  
Fourier Transforms ◽  
Cyanate Ester ◽  
Curing Behavior ◽  
Cyanate Ester Resin ◽  
Hydrolysis And Condensation ◽  
Ft Ir ◽  
Thermal Properties Of Materials ◽  
Properties Of Materials ◽  
Ft Ir Spectroscopy

A kind of nonfunctional silsesquioxane (SSQ), methylsilsesquioxane (Me-SSQ), was used to modify cyanate ester resin (CE) in this paper. First, methylsilsesquioxane (Me-SSQ) was synthesized by the hydrolysis and condensation of methyltriethoxysilane. Then a series of Me-SSQ/CE hybrids containing 0wt%, 1wt%, 5wt%, 10wt% and 20wt% of Me-SSQ were prepared. The effect of Me-SSQ content on the curing behavior and thermal properties of materials was investigated by using Fourier transforms infrared (FT-IR) spectroscopy and thermogravimetry (TG), respectively. FT-IR results indicate that the addition of Me-SSQ does not show significant effect on the conversion of CE. However, TG data show that Me-SSQ improved the thermal properties of CE greatly.

Curing Kinetics of Octaepoxysilsesquioxane/DDS System

2011 ◽  
Vol 233-235 ◽  
pp. 1834-1837
Author(s):  
Zeng Ping Zhang ◽  
Jian Zhong Pei ◽  
Shuan Fa Chen ◽  
Hong Zhao Du ◽  
Yong Wen
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Curing Kinetics ◽  
Scanning Calorimetry ◽  
Exponential Factor ◽  
Inorganic Hybrid ◽  
Oligomeric Silsesquioxane ◽  
Kinetics Of ◽  
Epoxy Groups ◽  
Important Kind

Polyhedral oligomeric silsesquioxane (POSS) can be incorporated into polymers to obtain organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) with eight reactive epoxy groups per molecule is an important kind of POSS. E-POSS was cured with 4,4'-diaminodiphenylsulfone diamine (DDS) in this study. The curing kinetics of the E-POSS/DDS system was studied by using differential scanning calorimetry (DSC). Kinssinger and Flynn-Wall-Ozawa methods were used to obtain the activation energy and pre-exponential factor of the curing reaction.

FACILE SYNTHESIS OF HYDROXYLAPATITE NANOSTRUCTURES WITH VARIOUS MORPHOLOGIES

NANO ◽  
2009 ◽  
Vol 04 (03) ◽  
pp. 165-170 ◽  
Author(s):  
XIAO-JUN HU ◽  
JIN-KU LIU ◽  
XIAO-YAN QIN ◽  
JIA HUANG ◽  
YI YI
Keyword(s):  
Crystal Engineering ◽  
Fourier Transforms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solution Approach ◽  
Engineering Research ◽  
Practical Applications ◽  
Transmission Electron ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy

The hydroxylapatite nanostructures with different morphologies have been synthesized by a facile solution approach. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) technologies, and Fourier transforms infrared spectroscopy (FT-IR). The control mechanism of the hydroxylapatite with various morphologies nanostructures was investigated. Some practical experimental conclusions could be obtained, which were expected to have potential values in crystal engineering research and practical applications.

Controllable Preparation of Zinc Phosphate Materials with Different Morphologies and Particle Size

2014 ◽  
Vol 1078 ◽  
pp. 20-24
Author(s):  
Jiang Jie Wang ◽  
Xiao Hong Yang ◽  
Jing Wang ◽  
Qin Tong ◽  
Jin Ku Liu
Keyword(s):  
Particle Size ◽  
Zinc Phosphate ◽  
Fourier Transforms ◽  
Control Mechanism ◽  
Functional Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Controllable Preparation

Zinc phosphate materials which have different morphologies, particle size and good crystalline were prepared via an effective template method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FT-IR). The control mechanism of the zinc phosphate was investigated. Some practical experimental conclusions could be obtained, which were expected to have potential values in synthesis of functional materials.

Curing Kinetics of Octaepoxysilsesquioxane/MNA System

2011 ◽  
Vol 84-85 ◽  
pp. 42-46
Author(s):  
Zeng Ping Zhang ◽  
Guo Zheng Liang ◽  
Shuan Fa Chen
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Hybrid Materials ◽  
Curing Kinetics ◽  
Scanning Calorimetry ◽  
Exponential Factor ◽  
Inorganic Hybrid ◽  
Oligomeric Silsesquioxane ◽  
Kinetics Of ◽  
Epoxy Groups

Polyhedral oligomeric silsesquioxane (POSS) can be added to polymers to prepare the organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) containing eight reactive epoxy groups in a molecule is one of the important POSSs. E-POSS was cured with methylnadic anhydride (MNA) in this study. The curing kinetics of the E-POSS/MNA system was studied by using differential scanning calorimetry (DSC). Two different kinds of methods, Kinssinger and Flynn-Wall-Ozawa, were used to calculate the activation energy and pre-exponential factor of the curing reaction.

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