Chemistry of aromatic polythioesters and polydithioesters

2015 ◽  
Vol 6 (16) ◽  
pp. 3131-3142 ◽  
Author(s):  
Daisuke Abe ◽  
Yuichiro Fukuda ◽  
Yuji Sasanuma
Keyword(s):  
Thermal Decomposition ◽  
Glass Transition ◽  
Molecular Motion ◽  
Thermal Transition

Aromatic polythioesters and polydithioesters with different numbers of methylene units have been synthesized and characterized in terms of solubility, crystallinity, glass transition, melting, thermal decomposition, molecular motion, and thermal transition.

Glass transition temperature and thermal decomposition of cellulose powder

Cellulose ◽  
2007 ◽  
Vol 15 (3) ◽  
pp. 445-451 ◽  
Author(s):  
Ludwik Szcześniak ◽  
Adam Rachocki ◽  
Jadwiga Tritt-Goc
Keyword(s):  
Thermal Decomposition ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Cellulose Powder

Thermal decomposition and glass transition of industrial hydrolysis lignin

2010 ◽  
Vol 101 (1) ◽  
pp. 289-295 ◽  
Author(s):  
H. Hatakeyama ◽  
Y. Tsujimoto ◽  
M. Ja. Zarubin ◽  
S. M. Krutov ◽  
T. Hatakeyama
Keyword(s):  
Thermal Decomposition ◽  
Glass Transition ◽  
Hydrolysis Lignin

Thermal Analysis of Nomex® and Kevlar® Fibers

1977 ◽  
Vol 47 (1) ◽  
pp. 62-66 ◽  
Author(s):  
J. R. Brown ◽  
B. C. Ennis
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Melting Point ◽  
Transition Region ◽  
High Temperatures ◽  
High Performance ◽  
Polymer Melt ◽  
Glass Transition Region ◽  
Dta Curves

DTA, TG, and TMA curves of commercial Kevlar® 49 and Nomex® fibers have been used to assess their behavior at high temperatures. The fibers lost absorbed water around 100°C, and a glass transition was reflected in the DTA and TMA curves in the region of 300°C. Difficulties in the interpretation of DTA and TMA curves in the glass-transition region and in the assignments of Tv‘s for these high-performance fibers are discussed. Whereas Kevlar 49 showed both a crystalline melting point (560°C) and a sharp endothermal thermal decomposition (590°C), Nomex showed only the latter (440°C) and no evidence of melting from the DTA curves. The endothermal decomposition peaks apparently correspond to “polymer melt temperatures” reported for related materials, and correlate well with the TG and TMA features. During thermal analysis of Kevlar 49, oxidation occurs more readily than thermal decomposition, but the latter predominates for Nomex. Differences between dyed and undyed Nomex were due to differences in yarn constitution.

Nanocomposite Epoxy Resin for SiC Module

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000196-000200 ◽  
Author(s):  
Kenji Okamoto ◽  
Yuji Takematsu ◽  
Miyako Hitomi ◽  
Yoshinari Ikeda ◽  
Yoshikazu Takahashi
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Epoxy Resin ◽  
Molecular Motion ◽  
Experimental Results ◽  
Power Module ◽  
Operation Temperature ◽  
Thermal Stability Of

There is a demand to improve the thermal stability of epoxy molding resins used in the power module of SiC power chips operating at temperatures of 200°C or more. This paper describes a technique for increasing the thermal stability of the resin by decreasing molecular motion through the addition of nanofiller. The experimental results showed that the glass transition temperature (Tg) of the epoxy resin increased by approximately 30°C when the silica nanofiller was added. The epoxy resin added nanofiller was investigated in order to achieve the operation temperature 200°C of power module.

Synthesis and Properties of Cellulose Stearate

2011 ◽  
Vol 228-229 ◽  
pp. 919-924 ◽  
Author(s):  
Feng Yuan Huang
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Transition Temperature ◽  
1H Nmr ◽  
Homogeneous System ◽  
Molar Ratio ◽  
Maximum Temperature ◽  
Key Factor ◽  
Ft Ir

Cellulose Stearate (CS) was synthesized by acylating microcrystalline cellulose (MCC) in homogeneous system with p-toluenesulfonyl chloride (Tos-Cl) and stearic acid (SA). The reactive conditions were discussed. The molar ratio of AGU:SA:Tos-Cl was the key factor which affected the degree of substitution (DS) of CS. In the present paper, CSs with DS ranging from 0.64 to 2.35 were prepared under mild condition. The structure of CS was characterized by FT-IR and 1H-NMR, and DS of CS was determined by traditional saponification method and 1H-NMR, respectively. The solubility of CS was also investigated; the results showed that the higher DS of CS was, the easier CS dissolved in organic solvents. The thermal analysis was measured with DSC, and the results indicated that the glass transition temperature (Tg) and the maximum temperature of thermal decomposition (Tmax) of CS were dependent on DS.

Effect of 1-(9-Ethyl-9H-carbazol-3-yl)-4,4,4-trifluorobutane-1,3-dione on Properties of Luminescent Europium (III) Complexes

2013 ◽  
Vol 834-836 ◽  
pp. 215-220
Author(s):  
Huai Jun Tang ◽  
Li Ying Wei ◽  
Qian Luo ◽  
Xian Wang Shen ◽  
Chang Li Liu
Keyword(s):  
Thermal Decomposition ◽  
Glass Transition ◽  
Luminescent Materials ◽  
Transition Temperatures ◽  
Luminescent Intensity ◽  
Glass Transition Temperatures ◽  
Amorphous Nature ◽  
Carbazole Group

In order to understand the effect of β-diketone ligands containing carbazole group on luminescent europium (III) complexes, a series of europium (III) complexes (Phen)Eu (DBM)3-nLnwith 1-(9-Ethyl-9H-carbazol-3-yl)-4,4,4-trifluorobutane-1,3-dione (L) were synthesized and investigated contrastively (n = 0, 1, 2, 3; DBM: dibenzoylmethane; Phen: 1,10-phenanthroline). The results show amorphous nature, glass transition temperatures and luminescent intensity can be improved obviously by 1-(9-ethyl-9H-carbazol-3-yl)-4,4,4-trifluorobutane-1,3-dione, at the same time, their thermal decomposition temperatures have seldom effected by it. The results verify the performance of europium (III) complexes used as luminescent materials can be effectively improved by the β-diketone ligands of this type.

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