Stable and unstable critical gel of thermoplastic polyurethanes

Stable and unstable critical gel of thermoplastic polyurethanes

Autori: D. Nichetti, N. Grizzuti
Presentato al: VIII Convegno Nazionale di Reologia
Anno: 2004
Volume: Unico - Issue: Unico
Casa Editrice:
Lingua: English

Abstract
The rich behaviour of thermoplastic polyurethanes (TPUs)
undergoing phase transitions is investigated by means of combined
rheological and DSC techniques. In particular, the kinetics of microphase
transition of TPUs are followed under both isothermal conditions
(crystallization from the melt), and constant temperature rate
heating ramps (melting). Rheological measurements reveal that the
micro-phase separation between hard and soft segments and the concurrent
crystallization of the hard phase domains produce a sol-to-gel
type of transition. In particular, the critical gel properties during the
crystallization transition are found to be quantitatively different from
those measured during the reverse, heating up process.

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XIX Italian Society of Rheology Conference

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The Italian Society of Rheology (SIR) organizes every two years the Italian Rheology Conference, which is the meeting point of the National and International rheological community to promote knowledge and discuss research in the field of rheology. The Conference consists of keynote lectures, oral communications and posters on topics related to all the thematic areas of rheology. The XIX edition will be held in the conference rooms of Plesso Belmeloro, in the city centre of Bologna, in June 16th-19th, 2026. Book your accommodation in Bologna well in advance, the city is a famous tourist destination and has limited availability of accommodations!

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