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Effects of cross-links, pressure and temperature on the thermal properties and glass transition behaviour of polybutadiene
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 13, no 33, 15047-15054 p.Article in journal (Refereed) Published
Abstract [en]

The thermal conductivity κ, heat capacity per unit volume ρcp and glass transition behaviour under pressure have been established for medium and high vinyl content polybutadiene PB with molecular weights 2600 and 100 000 and their highly cross-linked (ebonite) states obtained purely by high-pressure high-temperature treatments. Cross-linking eliminates the glass transitions and increases κ by as much as 50% at 295 K and 1 atm, and decreases ρcp to a limiting level close to that of the glassy state of PB, which is reached before the ultimate cross-link density is achieved. The pressure and temperature behaviours of κ are strongly changed by cross-links, which increases the effect of temperature but decreases the effect of pressure. We attribute these changes to a cross-linked induced permanent densification and consequential increase of phonon velocity simultaneously as conduction along polymer chains is disrupted. The glass transition temperatures for a time scale of 1 s are described to within 0.5 K by: Tg(p) = 202.5 (1 + 2.94 p)0.286 and Tg(p) = 272.3 (1 + 2.57 p)0.233 (p in GPa and T in K) up to 1 GPa, for PB2600 and PB100000, respectively, and can be estimated for medium and high vinyl content PBs with molecular weights in between by a constant, pressure independent, shift in temperature.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2011. Vol. 13, no 33, 15047-15054 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-45735DOI: 10.1039/C1CP20785GOAI: oai:DiVA.org:umu-45735DiVA: diva2:434499
Available from: 2011-08-15 Created: 2011-08-15 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Studies of novel phases and states produced by means of high pressure: Polymer and polymer based carbon nanocomposites
Open this publication in new window or tab >>Studies of novel phases and states produced by means of high pressure: Polymer and polymer based carbon nanocomposites
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Umeå: Institutionen för fysik, Umeå universitet, 2011
National Category
Materials Engineering
Research subject
Materials Science
Identifiers
urn:nbn:se:umu:diva-49817 (URN)978-91-7459-315-0 (ISBN)
Public defence
2011-12-15, Naturvetarhuset, N200, Umeå universitet, Umeå, 13:30
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Supervisors
Available from: 2011-11-24 Created: 2011-11-18 Last updated: 2011-11-21Bibliographically approved

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Yu, JunchunAndersson, Ove

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