Determination of activation energy of relaxation events in thermoplastic polyurethane by dynamic mechanical analysis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F75081431%3A_____%2F18%3A00001259" target="_blank" >RIV/75081431:_____/18:00001259 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Determination of activation energy of relaxation events in thermoplastic polyurethane by dynamic mechanical analysis

Original language description

"In the present study, the activation energy associated with the primary and the secondary relaxation transition events in thermoplastic polyurethane has been determined using the multi-frequency dynamic mechanical analysis tests. The thermoplastic polyurethane under investigation was tested at temperatures between 145 K - 526 K, at frequencies of 0.5 Hz, 1 Hz, 2 Hz, 5 Hz and 10 Hz and at a constant heating rate of 3 K·min–1. It was observed that the studied materials show three relaxation events – glass transition of soft segments, glass transition of hard segments as well as secondary transition associated with short range order translation and with reorientational motions within the polyurethane crystals. The activation energies for all three observed relaxation events were determined from dynamic mechanical properties measured at various frequencies using a linearized Arrhenius equation. The calculated activation energy is 379.73 kJ·mol-1 for the glass transition of hard segments; for the secondary relaxation transition it is 65.53 kJ·mol-1 and for the glass transition of soft segments it is 45.98 kJ·mol-1."

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Material Iwiss

ISSN

0933-5137

e-ISSN

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Volume of the periodical

Neuveden

Issue of the periodical within the volume

48

Country of publishing house

DE - GERMANY

Number of pages

8

Pages from-to

627-634

UT code for WoS article

000433499500013

EID of the result in the Scopus database

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