scholarly journals POLYMERIZATION OF 8-ACETOXYTETRACYCLO[4.4.12,5.17,10.01,6]DODEC-3-ENE AND ITS COPOLYMERIZATION WITH ACRYLIC ACIDS

2021 ◽  
pp. 31-37
Author(s):  
E.K. Makhmudova ◽  
◽  
R.A. Rasulova ◽  
V.S. Kadyrly ◽  
M.J. Ibrahimova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Ir Spectroscopy ◽  
Organic Solvent ◽  
Radical Polymerization ◽  
Monomer Ratio ◽  
Catalyst Temperature ◽  
Acrylic Acids ◽  
Thermal Stability Of

The reaction of radical polymerization of 8-acetoxytetracyclo[4.4.12,5.17,10.01,6]dodec-3-ene as well as its copolymerization with methacrylic acids in the presence of BF3·OEt2 in bulk and in the medium of organic solvent, particularly in benzene was investigated. The influence of various factors: the amount of catalyst, temperature and reaction time on the process of polymerization, as well as the influence of the monomer ratio on the copolymerization process was studied. The structure of the obtained homo- and copolymers was confirmed by IR spectroscopy and the thermal stability of the obtained polymers and their cured products was studied

Preparation and Electrical Conductivity of Polythiophene/Microcrystal Muscovite Layered Composites

2015 ◽  
Vol 814 ◽  
pp. 392-397 ◽  
Author(s):  
Ying Ling ◽  
Jian Ping Long
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Composite Materials ◽  
Reaction Time ◽  
Layered Composites ◽  
Synthesis Conditions ◽  
Conductive Composites ◽  
Monomer Ratio ◽  
Thermal Stability Of ◽  
Oxidation System

Polythiophene(PTP)/microcrystal muscovite conductive composites were prepared by the method of intercalating polymerization via Fe3+-H2O2 catalytic oxidation system in water. The morphology, structures, electrical conductivity and thermal stability of composites have been studied preliminary. The influence of the different synthesis conditions (temperature, monomer ratio, reaction time) on the conductivity of composite materials was explored. The results of the FTIR and XRD confirmed that thiophene (TP) inserted into the layers of microcrystal muscovite to polymerize and formed intercalation compounds. TG analysis indicated the improved thermostability of composite materials. The PTP/microcrystal muscovite composite made from 2g/ml solution of microcrystal muscovite/TP with reacting for 12h and 15°C showed the highest conductivity 3.56 ×10-5s/cm-1.

Organic solvent-free synthesis of phosphorus-containing polymers

2007 ◽  
Vol 79 (11) ◽  
pp. 1879-1884 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Aurelia Pascariu ◽  
Adriana Popa ◽  
Nicoleta Plesu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Bisphenol A ◽  
Organic Solvent ◽  
Molar Mass ◽  
Interfacial Polycondensation ◽  
H Nmr ◽  
Phosphorus Containing ◽  
Solvent Free Synthesis ◽  
Thermal Stability Of

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial polycondensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, 1H NMR, 31P NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.

scholarly journals Exploring the Complexation of Counterion in Novel Family of Polyelectrolytes with Unexpected Solubility Behaviour

2020 ◽  
Vol 869 ◽  
pp. 61-68
Author(s):  
Egor A. Bersenev ◽  
Alina Maryasevskaya ◽  
Evgenii V. Komov ◽  
Denis V. Anokhin ◽  
Dimitri A. Ivanov
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Lithium Salt ◽  
Ionic Form ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkali Ions ◽  
In Series ◽  
Chelating Complex ◽  
Thermal Stability Of

In the present paper we study the effect of complexation in linear negatively charged polyelectrolytes with different alkali ions. With combination of IR-spectroscopy, X-ray diffraction and nanocalorimetry, we attempted to explain unusual solubility, crystallinity and thermal stability of these polymers. The increase of thermal stability and insolubility in water in series of semi-crystalline polysalts as K+ ≤ H+ <Na+ was explained by effectiveness of formation of chelating complex. Insoluble in water sodium salt shows the highest thermal stability of crystal phase up to . In contrast, well soluble in water amorphous lithium salt does not self-organize in chelating complex and is presented in ionic form.

Thermal Stability of a-SiNx:H Films

1992 ◽  
Vol 284 ◽  
Author(s):  
V.Kh. Kudoyargva ◽  
A. A. Aivazov ◽  
B. G. Budaguan ◽  
I. V. Filatova
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Nitrogen Doping ◽  
Effective Technique ◽  
Thermal Stability Of

ABSTRACTThe investigations of thermal stability of a-SiNx:H films (x≤0.4) have xbeen performed bv both IR spectroscopy and DTA techniques. The properties of samples with x≤0.06 were attentively considered because in this case the nitrogen may be treated as an impurity in a-Si:H. It has been shown that controlled nitrogen doping (up to 0.5 Pa NH3) can be used as an effective technique for thermostabilization of a-Si:H properties.

Properties of Polyaniline with the Doping of Different Acid

2012 ◽  
Vol 502 ◽  
pp. 31-35 ◽  
Author(s):  
Xiao Hua Wang
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Acid Content ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Dodecylbenzenesulfonic Acid ◽  
Thermal Stability Of

Polyaniline(PANI) with the doping of hydrochloride(HC1), aminosulfonic acid (NH2SO3H) or dodecylbenzenesulfonic acid(DBSA) was prepared by in-situ polymerization. Effects of acid content, reaction time, oxidant ammonium persulfate (APS) dosage and reaction temperature on the conductivity of PANI were studied. The resistance and thermal stability of them were compared. Results show that the largest conductivity of HC1-PANI is 1.98 s.cm-1 among them in case the C(HC1)=0.5mol/L, reaction time is 6.0h, n(APS/aniline)=1.0; The conductivity of NH2SO3H-PANI is 0.2s.cm-1 in case the C(NH2SO3H)=1.0mol/L, reaction time is 6.0h, n(APS/aniline)=2.0; The conductivity of DBSA-PANI is 0.98s.cm-1 in case the C(DBSA)=1.0 mol/L, reaction time is 8.0h, n(APS/aniline) = 2.0. The the least resistance of HC1-PANI is 10Ω, and that of NH2SO3H- PANI is the largest of 120Ω. The order of their thermal stability is DBSA-PANI > NH2SO3H-PANI > HC1-PANI before 350°C, that of their thermal stability is inverse when it reaches 350°C.

scholarly journals PREPARATION OF CASTOR-BASED POLYURETHANE COMPOSITES FILLED WITH WASTE CARBON TYRES (WCT) AS GROUTING MATERIAL

2020 ◽  
Vol 82 (5) ◽  
Author(s):  
Nur Izzah Atirah Mat Hussain ◽  
Noor Najmi Bonnia ◽  
Radin Siti Fazlina Nazrah Hirzin ◽  
Ernie Suzana Ali ◽  
Suzana Ratim
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Reaction Time ◽  
Compression Strength ◽  
Foam Cell ◽  
Polyurethane Composite ◽  
Grouting Material ◽  
Polyurethane Composites ◽  
Uniform Particle Size ◽  
Thermal Stability Of

This research focused on the fabrication of castor-based polyurethane composite (CPUC) filled with waste carbon tyres (WCT) with particle size of 200 µm that acts as reinforcing filler. WCT was first sieved using a sieving machine to obtain uniform particle size. WCT loading was varied at 0wt%, 2wt%, 4wt% and 6wt%. The effect of WCT loading in CPUC was evaluated based on their foam reaction time, apparent density, rheology, compression strength, morphology and thermal properties. The foam reaction time of CPUC achieved was in the range of industrial PU grout’s properties. The rheology index and compression strength of CPUC decreased with increasing WCT loading. CPUC with 2wt% of WCT loading achieved the optimum compression strength where it increased from 2.58 MPa to 3.39 MPa with the improvement of 31.40% compared to neat PU. FESEM micrograph showed that CPUC consists of closed foam cell indicating the rigidity of the CPUC. The addition of 2wt% of WCT resulted in achieving the optimum thermal stability of CPUC where CPUC2 had the highest char residue content. The high residue content indicated that CPUC2 had the lowest decomposition of elements as WCT acted as heat barrier in CPUC matrix thus increasing the thermal stability of CPUC2.

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