scholarly journals Investigation of the chemical changes during the thermal treatment of acrylonitrile ‐co‐ methyl acrylate‐polymer (polyacrylonitrile‐precursor) focusing on the fate of the methyl acrylate moiety

2021 ◽  
pp. 52074
Author(s):  
Klaus Ruhland ◽  
Robert Horny ◽  
Andrea Wanzel ◽  
Sebastian Reisach ◽  
Alina Nizamutdinova ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Methyl Acrylate ◽  
Chemical Changes ◽  
Acrylate Polymer ◽  
Polyacrylonitrile Precursor

scholarly journals Physico-Chemical Investigation of Endodontic Sealers Exposed to Simulated Intracanal Heat Application: Hydraulic Calcium Silicate-Based Sealers

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 728
Author(s):  
David Donnermeyer ◽  
Magdalena Ibing ◽  
Sebastian Bürklein ◽  
Iris Weber ◽  
Maximilian P. Reitze ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Film Thickness ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Chemical Properties ◽  
Chemical Changes ◽  
Time Flow ◽  
Heat Application

The aim of this study was to gain information about the effect of thermal treatment of calcium silicate-based sealers. BioRoot RCS (BR), Total Fill BC Sealer (TFBC), and Total Fill BC Sealer HiFlow (TFHF) were exposed to thermal treatment at 37 °C, 47 °C, 57 °C, 67 °C, 77 °C, 87 °C and 97 °C for 30 s. Heat treatment at 97 °C was performed for 60 and 180 s to simulate inappropriate application of warm obturation techniques. Thereafter, specimens were cooled to 37 °C and physical properties (setting time/flow/film thickness according to ISO 6876) were evaluated. Chemical properties (Fourier-transform infrared spectroscopy) were assessed after incubation of the specimens in an incubator at 37 °C and 100% humidity for 8 weeks. Statistical analysis of physical properties was performed using the Kruskal-Wallis-Test (P = 0.05). The setting time, flow, and film thickness of TFBC and TFHF were not relevantly influenced by thermal treatment. Setting time of BR decreased slightly when temperature of heat application increased from 37 °C to 77 °C (P < 0.05). Further heat treatment of BR above 77 °C led to an immediate setting. FT-IR spectroscopy did not reveal any chemical changes for either sealers. Thermal treatment did not lead to any substantial chemical changes at all temperature levels, while physical properties of BR were compromised by heating. TFBC and TFHF can be considered suitable for warm obturation techniques.

Chemical changes in extra virgin olive oils from Slovenian Istra after thermal treatment

2008 ◽  
Vol 108 (2) ◽  
pp. 446-454 ◽  
Author(s):  
Erika Bešter ◽  
Bojan Butinar ◽  
Milena Bučar-Miklavčič ◽  
Terezija Golob
Keyword(s):  
Thermal Treatment ◽  
Chemical Changes ◽  
Virgin Olive Oils ◽  
Olive Oils

scholarly journals Chemical Changes in Extra Virgin Argan Oil after Thermal Treatment

2013 ◽  
Vol 8 (1) ◽  
pp. 1934578X1300800
Author(s):  
Saïd Gharby ◽  
Hicham Harhar ◽  
Badr Eddine Kartah ◽  
Dom Guillaume ◽  
Zoubida Charrouf
Keyword(s):  
High Temperature ◽  
Thermal Treatment ◽  
Physicochemical Parameters ◽  
Edible Oils ◽  
Polar Compounds ◽  
Chemical Changes ◽  
Argan Oil

Physicochemical parameters, measured every 6 hours, of extra virgin argan oil heated for 24 h at 180°C were investigated and compared with those of five other edible oils treated in the same thermoxidative condition. Argan oil was found to be particularly stable at high temperature, its level of polar compounds remaining low even after 24 h of heating.

Chemical changes accompanying oxygenation of coal by air and deoxygenation of oxidized coal by thermal treatment

Fuel ◽  
1989 ◽  
Vol 68 (9) ◽  
pp. 1129-1133 ◽  
Author(s):  
Ashim K. Banerjee ◽  
Debapriya Choudhury ◽  
Samar S. Choudhury
Keyword(s):  
Thermal Treatment ◽  
Chemical Changes ◽  
Oxidized Coal

Molecular interaction of fibrinogen with thermally modified titanium dioxide nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40428-40434 ◽  
Author(s):  
A. S. Zhao ◽  
S. Zhou ◽  
Y. Wang ◽  
J. Chen ◽  
C. R. Ye ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Thermal Treatment ◽  
Platelet Activation ◽  
Molecular Interaction ◽  
Titanium Dioxide Nanoparticles ◽  
Surface Chemical ◽  
Chemical Changes

Novelty lies in the attempt to connect protein changes and subsequent platelet activation to surface/chemical changes upon thermal treatment of TiO2NP's.

Investigation of the chemical changes during thermal treatment of polyacrylonitrile and 15N-labelled polyacrylonitrile by means of in-situ FTIR and 15N NMR spectroscopy

2017 ◽  
Vol 146 ◽  
pp. 298-316 ◽  
Author(s):  
K. Ruhland ◽  
R. Frenzel ◽  
R. Horny ◽  
A. Nizamutdinova ◽  
L. van Wüllen ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Thermal Treatment ◽  
15N Nmr ◽  
In Situ Ftir ◽  
Chemical Changes ◽  
15N Nmr Spectroscopy

Chemical changes in polyvinylacetate under radiation-thermal treatment

1967 ◽  
Vol 9 (6) ◽  
pp. 1359-1366
Author(s):  
V.A. Larin ◽  
Z.A. Markova ◽  
V.I. Yakovenko ◽  
N.A. Bakh
Keyword(s):  
Thermal Treatment ◽  
Chemical Changes
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