HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS.

I. R. Harrison, James Patrick Runt

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In the reported experiments, the melting points (T//m) of small quantities (ca. 0. 1 mg) of polyethylene (PE) single crystals in the dried state and in suspension were determined as a function of heating rate. Melting points were also obtained for large amounts (ca. 3 mg) of dried-down crystals. It has been reported previously that PE crystals of high molecular weight possess a single melting point and this T//m decreases with increasing heating rate. However, all samples in our study show multiple melting behavior. Moreover, suspension samples show little or no variation in the various peak temperatures with heating rate. There is some dependence of T//m on heating rate for small dry samples but the change of T//m is not nearly as great as previously reported. These small changes can be the result of the relatively poor resolution of small dry samples compared to suspension. Differences between the behavior reported here and those of other authors can be explained on the basis of the relative contributions to the various melting endotherms.

Original languageEnglish (US)
Pages (from-to)321-328
Number of pages8
JournalJ Polym Sci Polym Phys Ed
Volume17
Issue number2
StatePublished - Jan 1 1979

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Heating rate
Melting point
Polymers
Polyethylenes
Melting
Crystals
Molecular weight
Single crystals
Experiments
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Harrison, I. R., & Runt, J. P. (1979). HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS. J Polym Sci Polym Phys Ed, 17(2), 321-328.
Harrison, I. R. ; Runt, James Patrick. / HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS. In: J Polym Sci Polym Phys Ed. 1979 ; Vol. 17, No. 2. pp. 321-328.
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Harrison, IR & Runt, JP 1979, 'HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS.', J Polym Sci Polym Phys Ed, vol. 17, no. 2, pp. 321-328.

HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS. / Harrison, I. R.; Runt, James Patrick.

In: J Polym Sci Polym Phys Ed, Vol. 17, No. 2, 01.01.1979, p. 321-328.

Research output: Contribution to journalArticle

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AB - In the reported experiments, the melting points (T//m) of small quantities (ca. 0. 1 mg) of polyethylene (PE) single crystals in the dried state and in suspension were determined as a function of heating rate. Melting points were also obtained for large amounts (ca. 3 mg) of dried-down crystals. It has been reported previously that PE crystals of high molecular weight possess a single melting point and this T//m decreases with increasing heating rate. However, all samples in our study show multiple melting behavior. Moreover, suspension samples show little or no variation in the various peak temperatures with heating rate. There is some dependence of T//m on heating rate for small dry samples but the change of T//m is not nearly as great as previously reported. These small changes can be the result of the relatively poor resolution of small dry samples compared to suspension. Differences between the behavior reported here and those of other authors can be explained on the basis of the relative contributions to the various melting endotherms.

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Harrison IR, Runt JP. HEATING RATE DEPENDENCE OF POLYMER MELTING POINTS. J Polym Sci Polym Phys Ed. 1979 Jan 1;17(2):321-328.