Application of thermal analysis for the investigation of polymer degradation processes

1995 ◽  
Vol 43 (2) ◽  
pp. 505-508 ◽  
Author(s):  
J. Pielichowski ◽  
K. Pielichowski
Keyword(s):  
Thermal Analysis ◽  
Polymer Degradation ◽  
Degradation Processes

Thermal Analysis of Butadiene Styrene Block Copolymers

1969 ◽  
Vol 42 (3) ◽  
pp. 918-923 ◽  
Author(s):  
J. N. Anderson ◽  
F. C. Weissert ◽  
C. J. Hunter
Keyword(s):  
Thermal Analysis ◽  
Osmium Tetroxide ◽  
Polymer Degradation ◽  
Glass Temperature ◽  
Index Method ◽  
K Value ◽  
Styrene Copolymers ◽  
Compositional Distribution ◽  
Composition Graph ◽  
Butadiene Styrene

Abstract The Gordon—Taylor—Wood relationship between composition and glass temperature has been used as the basis of a DTA method for block styrene analysis in butadiene styrene copolymers having the same microstructure and a similar compositional distribution. The determined K value of the Gordon—Taylor—Wood equation for these polymers prepared with a butyllithium catalyst is in fair agreement with values previously determined for emulsion butadiene styrene copolymers. The total styrene content of the copolymer was determined using the refractive index method, and the composition of the “non-block” segment of the copolymer was obtained from DTA measurement using a Tg as a function of composition graph The amount of block styrene can then be obtained by difference. Evidence is presented supporting the validity of the method, and the results are compared with those obtained by a chemical method which involved polymer degradation by a hydroperoxide in the presence of osmium tetroxide. The thermal analysis requires approximately one-half hour. All measurements are made on the dry polymer eliminating the necessity of redissolving the polymer as required by most other methods of analysis.

Thermal Analysis of Kenaf Sandwich Core Panel

2012 ◽  
Vol 576 ◽  
pp. 488-491
Author(s):  
S.K. Abdul Rahman ◽  
Z. Halim
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Sandwich Panel ◽  
Degradation Processes ◽  
Sandwich Core ◽  
Thermal Stability Of

The thermal stability of kenaf sandwich panel core structures are presented in this paper. Sandwich core structures tested are of varying kenaf percentage being 10, 20 and 30 wt%. The result indicated that all composite have two step degradation processes due to the presence of kenaf in epoxy. From the discussion, increasing the kenaf percent ratio will decrease the percent residue.

Heat-Induced Degradation Processes in Forest Soils

1991 ◽  
Vol 1 (3) ◽  
pp. 147 ◽  
Author(s):  
B Soto ◽  
E Benito ◽  
F Diaz-Fierros
Keyword(s):  
Thermal Analysis ◽  
Organic Matter ◽  
Differential Thermal Analysis ◽  
Forest Soils ◽  
Pinus Pinaster ◽  
Analysis Data ◽  
Differential Thermal Analysis Data ◽  
Thermal Analysis Data ◽  
Degradation Processes ◽  
Simulated Rain

Degradation by heating was studied in samples from the top 5 cm of six woolandHumic Cambisols under Ulex and Pinus pinaster stands in N.W. Spain. After heating to various temperatures, the samples were exposed for 30 minutes to simulated rain with an energy of 24.16 joul m-2 mm-1. Three kinds of degradation were observed: 1) loss of organic matter and water by volatilization ; 2) dry breakdown ; and 3) wet breakdown. The observed degradation processes correlated well with the differential thermal analysis data. Below 170°C, volatilization losses appeared, but there was no dry breakdown and resistance to wet breakdown increased slightly; between 170°C and 380–460°C, all three kinds of degradation increased greatly; and above 460°C, no further volatilization, non dry breakdown ocurred, and wet breakdown tended to decrease.

Thermal Volatilization Analysis: A Versatile Platform for Spectroscopic Investigations of Polymer Degradation Processes

1999 ◽  
Vol 53 (11) ◽  
pp. 1403-1411 ◽  
Author(s):  
Xiaoyen (Kathy) Guo ◽  
Bin Huang ◽  
Tania Dyakonov ◽  
Yan Chen ◽  
Laz Padron ◽  
...  
Keyword(s):  
Polymer Degradation ◽  
Spectroscopic Investigations ◽  
Degradation Processes
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