Crystallisation behavior and crystal rearrangement of poly(ethylene oxybenzoate)
2005 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, Vol. 413/414, no Sp. Iss. SI, 435-441 p.Article in journal (Refereed) Published
One complex fact of polymer crystallisation is that polymer crystals have a tendency to rearrange with time. In this paper, poly(ethylene oxybenzoate)s (PEOB) with different degrees of polymerisation ranging from 5 to 30 have been studied by differential scanning calorimetry and polarised microscopy. The samples showed a great tendency for crystal rearrangement during heating to the melting point, even at high heating rates. The relationship between melting point and crystallisation temperature was analyzed and the Hoffman-Weeks method was found to be unsuitable for determining the equilibrium melting point of these polymers. It is proposed that fast crystal rearrangement, which is a characteristic feature of poly(ethylene oxybenzoate), is the reason for the inadequacy of the Hoffman-Weeks method to obtain reliable estimates of the equilibrium melting point. Polarised microscopy showed, remarkably in view of the low molar mass of the polymers, the formation of perfect banded spherulites. Linear growth rate data suggested that the branched polymers crystallised more slowly than their linear analogues, presumably due to differences in the equilibrium melting point.
Place, publisher, year, edition, pages
2005. Vol. 413/414, no Sp. Iss. SI, 435-441 p.
Crystal rearrangement, Equilibrium melting point, Melting, Polymer crystallisation
IdentifiersURN: urn:nbn:se:kth:diva-5973DOI: 10.1016/j.msea.2005.08.168ISI: 000234202900071ScopusID: 2-s2.0-29444447766OAI: oai:DiVA.org:kth-5973DiVA: diva2:10525
QC 201009072006-06-072006-06-072010-09-07Bibliographically approved