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Crosslinking, therm...
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Tonpheng, BounphanhUmeå universitet,Institutionen för fysik
(author)
Crosslinking, thermal properties and relaxation behaviour of polyisoprene under high-pressure
- Article/chapterEnglish2008
Publisher, publication year, extent ...
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Elsevier BV,2008
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:umu-11298
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-11298URI
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https://doi.org/10.1016/j.eurpolymj.2008.07.010DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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The transient hot-wire method has been used to measure the thermal conductivity k and heat capacity per unit volume rcp of untreated (virgin) and crosslinked cis-1,4-poly(isoprene) (PI) in the temperature range 160–513 K for pressures p up to 0.75 GPa. The results show that the crosslinking rate of the polymer chains becomes significant at 513 K on isobaric heating at 0.5 GPa changing PI into an elastomeric state within 4 h without the use of crosslinking agents. The crosslinked PI and untreated PI have about the same k = 0.145 Wm-1 K-1 and cp = 1.81 kJ kg-1 K-1 at 295 K and 20 MPa, but different relaxation behaviours. Two relaxation processes, corresponding to the segmental and normal modes, could be observed in both PI and crosslinked PI but these have a larger distribution of relaxation times and become arrested at higher temperatures (10 K) in the latter case. The arrest temperature for the segmental relaxation of untreated and crosslinked PI, for a relaxation time of 1 s, are described well by the empirical relations: T(p) = 209.4 (1 + 4.02 p)^0.31 and T(p) = 221.3 (1 + 2.33 p)^0.40 (p in GPa and T in K), respectively, which thus also reflects the pressure variations of the glass transition temperatures.
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Andersson, OveUmeå universitet,Institutionen för fysik(Swepub:umu)ovan0001
(author)
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Umeå universitetInstitutionen för fysik
(creator_code:org_t)
Related titles
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In:European Polymer Journal: Elsevier BV44:9, s. 2865-28730014-30571873-1945
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