Tacticity dependence of thermal degradation of PMMAs with the same chemical structure

1989 ◽  
Vol 21 (4) ◽  
pp. 433-437 ◽  
Author(s):  
Tatsuki Kitayama ◽  
Hideki Horii ◽  
Koichi Hatada ◽  
Takashi Kashiwagi
2015 ◽  
Vol 35 (3) ◽  
pp. 231-239 ◽  
Author(s):  
Maria Mucha ◽  
Sylwia Ksiazek ◽  
Halina Kaczmarek

Abstract Thin films of chitosan acetate (CSA)-copper (II) [Cu (II)] complex were prepared by mixing Cu (II) oxide (CuO) nanoparticles in acetic acid solution of chitosan and the casting method. The changes in chemical structure of modified chitosan were confirmed by UV-Vis spectroscopy. Fourier transform infrared (FTIR) spectroscopy was applied to monitor thermal degradation processes occurring in chitosan and its composites with Cu. The changes in concentration of chitosan functional groups were observed. On a base of the kinetic constants of group thermal degradation at various temperatures, the activation energies for various groups were calculated. It was found that the presence of Cu (II) ions accelerates the thermal degradation of chitosan acetate. The higher the Cu (II) content was in the CSA matrix, the lower was the activation energy.


2012 ◽  
Vol 260-261 ◽  
pp. 593-597
Author(s):  
Veronika Sassmanová ◽  
Zuzana Poláčková ◽  
Jaroslav Frantík ◽  
Stanislav Honus ◽  
Dagmar Juchelková

The article deals with the identification of a chemical structure of pyrolysis liquid occurring by the thermal degradation of tyre debris within the temperature interval from 500°C to 650°C and the temperature increase steps of 50°C in individual experiments and with the use of analytical methods GC/MS, FT-IR and the elementary analysis. The measured FT-IR spectra indicate the representation of functional groups included in measured samples. They could be used for the determination of basic chemical properties. There were changes in the chemical composition monitored as well as the creation of functional groups in the pyrolysis liquid on the basis of FT-IR spectra and GS/MS outcomes.


2018 ◽  
Vol 134 ◽  
pp. 25-34 ◽  
Author(s):  
Yanqin Huang ◽  
Huacai Liu ◽  
Hongyou Yuan ◽  
Xiuzheng Zhuang ◽  
Song Yuan ◽  
...  

1986 ◽  
Vol 14 (1) ◽  
pp. 85-93 ◽  
Author(s):  
L. Costa ◽  
G. Camino ◽  
A. Guyot ◽  
M. Bert ◽  
G. Clouet ◽  
...  

2012 ◽  
Vol 130 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Franziska S. Hanschen ◽  
Sascha Rohn ◽  
Inga Mewis ◽  
Monika Schreiner ◽  
Lothar W. Kroh

2020 ◽  
Vol 49 (08) ◽  
pp. 1951-1957
Author(s):  
Ain Nadiah Sofiah Ahmad Khorairi ◽  
Noor Soffalina Sofian-Seng ◽  
Rizafizah Othaman ◽  
Khairul Farihan Kasim

Author(s):  
J. Silcox

In this introductory paper, my primary concern will be in identifying and outlining the various types of inelastic processes resulting from the interaction of electrons with matter. Elastic processes are understood reasonably well at the present experimental level and can be regarded as giving information on spatial arrangements. We need not consider them here. Inelastic processes do contain information of considerable value which reflect the electronic and chemical structure of the sample. In combination with the spatial resolution of the electron microscope, a unique probe of materials is finally emerging (Hillier 1943, Watanabe 1955, Castaing and Henri 1962, Crewe 1966, Wittry, Ferrier and Cosslett 1969, Isaacson and Johnson 1975, Egerton, Rossouw and Whelan 1976, Kokubo and Iwatsuki 1976, Colliex, Cosslett, Leapman and Trebbia 1977). We first review some scattering terminology by way of background and to identify some of the more interesting and significant features of energy loss electrons and then go on to discuss examples of studies of the type of phenomena encountered. Finally we will comment on some of the experimental factors encountered.


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