scholarly journals Benzoxazine Containing Fluorinated Aromatic Ether Nitrile Linkage: Preparation, Curing Kinetics and Dielectric Properties

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1036 ◽  
Author(s):  
Sijing Chen ◽  
Dengxun Ren ◽  
Bo Li ◽  
Kui Li ◽  
Lin Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
Curing Kinetics ◽  
Decomposition Temperature ◽  
Surface Wettability ◽  
Condensation Polymerization ◽  
Nmr Spectrum ◽  
Kinetics Of ◽  
Bisphenol Af ◽  
Aromatic Ether

Benzoxazine containing fluorinated aromatic ether nitrile linkage (FAEN-Bz) had been synthesized from 2,6-dichlorobenzonitrile, 4,4’-(hexafluoroisopropylidene)diphenol (bisphenol AF), 3-Aminophenol, formaldehyde, phenol by condensation polymerization and Mannich ring-forming reaction. Structures of the monomer were verified by Proton NMR spectrum (1H-NMR) and Fourier transform infrared spectroscopy (FTIR). Curing behaviors and curing kinetics of designed monomers were investigated and discussed. The activation energy was calculated and possible polymerization mechanisms were also proposed. Then, properties of cured polymers including crosslinking degrees, thermal decomposition, surface wettability and energy, and dielectric properties were studied and discussed. Additionally, programmed integral decomposition temperature (IPDT) was also used to evaluate the thermal stability of final polymers. Results indicated that the incorporation of benzoxazine and nitrile resulted in increased thermal stability and char yields. Moreover, the surface wettability and dielectric properties of poly(FAEN-Bz) can be easily controlled by tuning the curing temperatures and time.

scholarly journals Curing kinetics of phenolphthalein based polyphosphazene towards thermal stability and flame retardancy of polybenzoxazine

RSC Advances ◽  
2019 ◽  
Vol 9 (54) ◽  
pp. 31583-31593 ◽  
Author(s):  
Ling Zhao ◽  
Chunxia Zhao ◽  
Min Wu ◽  
Yuntao Li ◽  
Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Flame Retardancy ◽  
Curing Kinetics ◽  
Ultrasound Assisted ◽  
Kinetics Of ◽  
Polymerization Method ◽  
Scanning Electron

Phenolphthalein type polyphosphazene (PZPT) microspheres were synthesized by an ultrasound assisted precipitation polymerization method, and their structures were confirmed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy.

Effect of silanized sisal fiber on thermo-mechanical properties of reinforced epoxy composites

2019 ◽  
Vol 54 (15) ◽  
pp. 2037-2050
Author(s):  
M Moeez Mughal ◽  
M Wasim Akhtar ◽  
M Moazam Baloch ◽  
Muddassir Ali Memon ◽  
Junaid Ali Syed ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Epoxy Composite ◽  
Decomposition Temperature ◽  
Sisal Fiber ◽  
Stability Parameters ◽  
Molar Solution ◽  
Integral Procedure ◽  
Thermal Stability Parameters ◽  
Kinetics Of

An effective method was adopted to improve the thermo-mechanical properties of the epoxy composite by functionalization of the sisal fiber. Initially, a neat sisal fiber was acetylated with molar solution of acidic mixture (0.5:1 of HNO3:H2SO4) that removed the content of lignin and hemicellulose and increased the crystallinity of the sisal fiber. The acetylated sisal ( a-sisal) fiber was further treated with 3-aminpropyltriethoxy silane to graft the silanol moieties on sisal fiber. The functionalization of the sisal fiber with 3-aminpropyltriethoxy silane exhibits the strong interaction with epoxy, resulting in homogenous dispersion of the sisal fiber in epoxy. The composite possesses great enhancement in thermal and mechanical properties. The tensile strength in functionalized sisal epoxy composite ( CP-f-Sisal) was significantly enhanced up to 23% in comparison to non-functionalized sisal epoxy composite ( CP-n-Sisal) by adding 15 wt.% of the sisal fiber. In addition, the functionalized sisal epoxy composite ( CP-f-sisal) shows better thermal stability as compared to non-functionalized sisal epoxy composite ( CP-n-sisal). Similar results are attributed by investigating the kinetics of thermal stability parameters that include activation energy and integral procedure decomposition temperature.

Influence of Organomodified Ni-Al Layered Double Hydroxide (LDH) Content on the Thermal Properties and Degradation Kinetics of Polystyrene (PS)/Ni-Al LDH Nanocomposites Prepared via Solvent Blending Method

2013 ◽  
Vol 747 ◽  
pp. 23-26 ◽  
Author(s):  
Manish Kumar Sinha ◽  
G. Pugazhenthi
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Degradation Kinetics ◽  
Decomposition Temperature ◽  
Thermal Degradation Kinetics ◽  
Blending Method ◽  
Friedman Method ◽  
Double Hydroxide ◽  
Kinetics Of ◽  
Thermal Stability Of

A series of polystyrene (PS) nanocomposites with various concentration of organomodified Ni-Al LDH (3, 7 wt%) were synthesized by solvent blending method and the effect of Ni-Al LDH content on the thermal properties and degradation kinetics of PS/ Ni-Al LDH nanocomposites was examined. Thermogravimetric analysis (TGA) was employed to evaluate the thermal properties of the prepared PS nanocomposites with various content of Ni-Al LDH. The obtained TGA results reveal that the PS/Ni-Al LDH nanocomposites exhibits enhanced thermal stability when compared with pure PS and the thermal stability of the nanocomposites increase with an increase in the LDH content from 3 to 7 wt%. When 15% weight loss is selected as a point of comparison, the thermal decomposition temperature of the PS/Ni-Al LDH nanocomposite containing 7 wt% of LDH is about 28°C higher than that of pure PS. The thermal degradation kinetics of the nanocomposite materials are investigated using two kinetic models such as Flynn-Wall-Ozawa method and Friedman method. The improvement of thermal stability of the nanocomposites with increasing LDH content is also validated by increasing the activation energies.

The Synthesis of Silicon-Containing Epoxy Resin and its Application in Environmentally-Friendship Epoxy Molding Compound for IC Packaging

2011 ◽  
Vol 211-212 ◽  
pp. 638-642 ◽  
Author(s):  
Ming Shan Yang ◽  
Jian Wei Liu ◽  
Lin Kai Li
Keyword(s):  
Thermal Stability ◽  
Epoxy Resin ◽  
Curing Kinetics ◽  
Curing Temperature ◽  
Molding Compound ◽  
Ic Packaging ◽  
Ortho Cresol ◽  
Novolac Epoxy ◽  
Kinetics Of ◽  
Thermal Stability Of

Silicon-containing epoxy resin (CNE-Si) was synthesized from diphenylsilandiol (DPSD) and ortho-cresol novolac epoxy resin using SnCl2 as catalyst. The chemical structure of CNE-Si prepared in this paper was characterized by 1H-NMR and FTIR. The thermal stability was analyzed by TGA. The result showed that the –Si- group enhanced the thermal stability of the epoxy resin. The curing kinetics of the system was studied by non-isothermal DSC. The kinetic parameters of the curing reaction including the activation energy were calculated using Kissinger and Ozawa method. The results showed that the system containing CNE-Si has lower curing temperature and more quick curing speed compared to CNE, which can be used for manufacturing the quick-curing EMCs or afterward-curing-free EMCs.

Thermal and dielectric properties and curing kinetics of nanomaterials formed from poss-epoxy and meta-phenylenediamine

Polymer ◽  
2004 ◽  
Vol 45 (20) ◽  
pp. 6897-6908 ◽  
Author(s):  
Wen-Yi Chen ◽  
Yen-Zen Wang ◽  
Shiao-Wei Kuo ◽  
Chih-Feng Huang ◽  
Pao-Hsiang Tung ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Curing Kinetics ◽  
Kinetics Of

Curing Kinetics of Cyano Functionalized Benzoxazine

2011 ◽  
Vol 233-235 ◽  
pp. 2337-2340
Author(s):  
Wen Jin Chen ◽  
Xiao Bo Liu
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Theoretical Calculations ◽  
Curing Kinetics ◽  
High Thermal Stability ◽  
Order Model ◽  
Scanning Calorimetry ◽  
Autocatalytic Model ◽  
Kinetics Of

A multifunctional benzoxazine monomer (BZCN) was synthesized, which has several outstanding properties, such as high thermal stability and high glass transition. To better understand the curing kinetics of BZCN, isothermal differential scanning calorimetry measurements were used to determine the kinetic parameters and the kinetic models of the curing processes of benzoxazine monomer with cyano functionality. The result shows the mechanism of the curing reaction of BZCN exhibits autocatalytic model, but doesn’t meet nth-order model. Owing to the effects of catalysis of cyano functionality, the activation energy is 89.65KJ•mol-1and the total order of reaction is 1.84, which is quite different from that of normal benzoxazine. The theoretical calculations matched reasonably well with the experimental results.

Research on Thermal Degradation Kinetics of Polyphenylene Sulfide Filter Media

2013 ◽  
Vol 300-301 ◽  
pp. 1171-1174 ◽  
Author(s):  
De Qiang Chang ◽  
Jing Xian Liu ◽  
Ning Mao ◽  
Bao Zhi Chen
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Decomposition Temperature ◽  
Polyphenylene Sulfide ◽  
Thermal Degradation Kinetics ◽  
Filter Media ◽  
Initial Decomposition Temperature ◽  
Kinetics Of ◽  
Thermal Stability Of

In order to study the thermal stability of PPS (polyphenylene sulfide) filter media, by means of thermogravimetry(TG), thermal degradation kinetics behavior of two kinds of PPS filter media were analyzed. The kinetic parameters of PPS filter media were obtained according to Flynn-Wall-Ozawa method. Thermal stability of PPS filter media was discussed. It was found that the initial decomposition temperature and activation energy of N3 sample are all higher than B1 sample, the thermal stability of N3 sample is better than B1 sample, and kinetic analysis can be used as an important method to evaluate the thermal stability of filter media.

Comparison of Thermal Stability of Sulfur, Peroxide and EB Irradiation Cured NR Compounds Containing Ground EPDM Waste

2013 ◽  
Vol 844 ◽  
pp. 267-271
Author(s):  
Hayeemasae Nabil ◽  
Hanafi Ismail ◽  
A. Rashid Azura
Keyword(s):  
Thermal Stability ◽  
Electron Beam Irradiation ◽  
Degradation Process ◽  
Decomposition Temperature ◽  
Activation Energies ◽  
Rubber Compounds ◽  
Kinetics Of Degradation ◽  
Kinetics Of ◽  
Thermal Stability Of ◽  
Good Agreement

This article described concerning to the effect of sulfur, peroxide and electron beam irradiation cured on the thermal stability of natural rubber compounds containing ground EPDM waste. Semi-efficient vulcanization (semi-EV), dicumyl peroxide (DCP) and the EB irradiation at 200 kGy were used and applied in the compounds. Thermal analysis namely thermogravimettric analysis (TGA) and its kinetics of degradation process were investigated. Results indicated that the EB irradiation revealed superior thermal stability by shifting the decomposition temperature at various weight loss and maximum derivatives followed by peroxide and sulfur vulcanizing systems. The activation energies of degradation of the vulcanizates were determined by applying the Coats-Redferns method. It can be verified that the activation energies observed in the vulcanizates were in good agreement with the thermogram results. The highest thermal stability obtained from EB irradiation might be due irradiation-induced-crosslinking resulting to more thermal energy is supplied to overcome the apparent activation energy of the vulcanizates.

Thermal stability and curing kinetics of polycarbosilane fibers

2006 ◽  
Vol 16 (1) ◽  
pp. 44-48 ◽  
Author(s):  
Chun-man ZHENG ◽  
Xiao-dong LI ◽  
Hao WANG ◽  
Bin ZHU
Keyword(s):  
Thermal Stability ◽  
Curing Kinetics ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document