Preparation of hybrid cyanate ester resin in the presence of polysilazane and its properties

2020 ◽  
pp. 095400832095161
Author(s):  
Xiaomeng Huo ◽  
Kangkang Guo ◽  
Fan Wang ◽  
Yaping Zhu ◽  
Huimin Qi
Keyword(s):  
Ir Spectroscopy ◽  
Flexural Modulus ◽  
Cyanate Ester ◽  
Curing Temperature ◽  
Polymerization Reaction ◽  
Polymerization Temperature ◽  
Cyanate Ester Resin ◽  
Short Period ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

A hybrid cyanate ester resin containing polysilazane was prepared via the prepolymerization of bisphenol-A dicyanate ester monomer (BADCy) in the presence of polysilazane (PSZ) under low temperature conditions in a short period of time. Fourier transform-infrared (FT-IR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy reveal that the polymerization reaction of BADCy can be carried out in the presence of PSZ to obtain a hybrid resin below 100°C and polymethylsilazane (PHS) exhibits an improved prepolymerization effect when compared to polydimethylsilazane (PMS). FT-IR spectroscopy and gel permeation chromatography (GPC) showed that the prepolymerization degree of the PHS/BADCy resin increased upon increasing PHS mass fraction from 0 to 12 wt%, polymerization temperature from 60 to 100°C and polymerization time from 0 to 4 h. The PHS/BADCy hybrid resins samples were prepared and their process properties were investigated by rheometry and Differential scanning calorimetry (DSC). The results indicated that their viscosity was <10 Pa.s in the temperature range of 60–130°C, and the initial curing temperature and curing exothermic enthalpy were 121.9°C and 358.9 J/g, respectively. Furthermore, the cured PHS/BADCy resin possesses excellent thermal and mechanical properties, the 5% weight loss temperature (Td5) and glass transition temperature (Tg) were 424–441°C and 273–282°C, respectively. The cured PHS/BADCy resin with 4 wt% PHS showed the highest flexural strength of 146 MPa and flexural modulus of 4.1 GPa.

scholarly journals Wool Fabric Treated With Eco – Friendly Insect Repellent

2017 ◽  
Vol 25 (0) ◽  
pp. 102-105
Author(s):  
Silva Kreševič Vraz ◽  
Bojana Vončina
Keyword(s):  
Ir Spectroscopy ◽  
Research Work ◽  
Curing Temperature ◽  
Wool Fabric ◽  
Insect Repellent ◽  
Textile Materials ◽  
Separate Treatment ◽  
Ft Ir ◽  
Time Periods ◽  
Ft Ir Spectroscopy

In the research work presented, fabric made of wool was grafted with β-cyclodextrine (β-CD) using 1, 2, 3, 4 butanetetracarboxlic acid (BTCA) as a polyfunctional reagent. To reduce the grafting curing temperature, which could damage the wool fabric if too high, cyanamide (CA) in combination with ammonium dihydrogen phosphat (ADHP) were used as catalysts. The presence of cedar oil applied onto textile materials was determined by ATR FT-IR spectroscopy, as well as estimation of the add-on of cedar oil with the gravimetric approach, respectively. Finally the reduction in moths after being exposed to wool treated with a separate treatment formulation i.e. β-CD, cedar oil, and β-CD in combination with cedar oil was assessed visually after different time periods. Results showed that the wool after being treated with β-CD in combination with cedar oil shows significantly prolonged moth oppression activity compared to the wool treated with cedar oil only.

Antifelting-Coating for Wool from PPD-[Si(OH)3]2 Agent via a Sol-Gel Process

2011 ◽  
Vol 233-235 ◽  
pp. 151-154 ◽  
Author(s):  
Yi Hu ◽  
Jin Qiang Liu ◽  
Chun Lei Xu
Keyword(s):  
Ir Spectroscopy ◽  
Sol Gel ◽  
Test Method ◽  
Curing Temperature ◽  
Cure Process ◽  
Sol Gel Process ◽  
Ft Ir ◽  
Fiber Microstructure ◽  
Ft Ir Spectroscopy

A sol type anti-felting agent containing PPD-[Si(OH)3]2 synthesized and applied to the wool with pad-dry-cure process. The structure of the prepolymer was characterized by FT-IR spectroscopy and the film transparency and the fiber microstructure were proved though UV-vis analysis and WAXD. The results indicated that the coating could endow a better anti-felting effect with low curing temperature at 120°C and 3 min, the area shrinking rate from13.44% of the original fabric decrease to 2.86% of the treated samples without strength decreased and handle changed stiff seriously, which accord with the IWS Test Method 31 standard.

scholarly journals FTIR analysis and the effects of alkyd/melamine resin ratio on the properties of the coatings

2009 ◽  
Vol 63 (6) ◽  
pp. 637-643 ◽  
Author(s):  
Suzana Cakic ◽  
Ljiljana Boskovic
Keyword(s):  
Ir Spectroscopy ◽  
Functional Groups ◽  
Curing Temperature ◽  
Ftir Analysis ◽  
Curing Time ◽  
Melamine Resin ◽  
Coating Properties ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Alkyd/melamine resin mixtures are mainly used in industrial baking enamels. The effects of the alkyd/butylated melamine resin ratio (from 90/10 to 50/50) and curing temperature (from 110 to 180?C) on the crosslinking and properties of the coating are presented in this paper. The curing reactions through functional groups of resins were monitored by FT-IR spectroscopy. The hardness, elasticity, degree of adherence and gloss were also determined. Optimal coating properties could be achieved with an alkyd/melamine resin ratio of 80/20, a curing temperature of 150?C and a curing time of 20 min.

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.

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

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