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Thermal stability of hydrogen networks by chemical stress relaxation

✍ Scribed by Shaw, Montgomery T. ;Tobolsky, Arthur V.

Publisher
Wiley (John Wiley & Sons)
Year
1971
Tongue
English
Weight
371 KB
Volume
9
Category
Article
ISSN
0449-296X

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✦ Synopsis

Abstract

The thermal stability of hydrocarbon networks by chemical stress relaxation was investigated in vacuo and in the temperature range 300–350°C. The polymers studied were low‐density polyethylene, high‐density polyethylene, and ethylene–propylene terpolymer. Carbon‐carbon crosslinked networks were produced either by dicumyl peroxide or by radiation. The results show that the overall thermal stability is in the order: peroxide‐cured EPT > peroxide‐cured LDPE > radiation‐cured HDPE. The results are in apparent contradiction to the belief that linear structures are more stable than branched structures. We believed that this can be explained in terms of weak linkages introduced during curing.

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✍ Yoshihiro Ootao; Ryuusuke Kawamura; Yoshinobu Tanigawa; Ryuutarou Imamura 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 531 KB

In this study, a neural network is applied to optimization problems of material compositions for a nonhomogeneous hollow sphere with arbitrarily distributed and continuously varied material properties such as functionally graded material (FGM). Using the analytical procedure of a laminated hollow sp