HEAT OF FUSION OF POLYMER CRYSTALS: POLYETHYLENE CRYSTALS IN SUSPENSION.

I. R. Harrison; J. Runt; L. J. Stanislow; D. A. Bell

HEAT OF FUSION OF POLYMER CRYSTALS: POLYETHYLENE CRYSTALS IN SUSPENSION.

I. R. Harrison, J. Runt, L. J. Stanislow, D. A. Bell

Research output: Contribution to journal › Article › peer-review

Abstract

Recent experiments have supported the view that polyethylene (PE) single crystals kept in suspension, in a variety of liquids, have different physical properties compared with the same crystals after drying. The present work was undertaken in an attempt to directly measure one of the basic properties of crystals in suspension, namely their percent crystallinity (X). Differential scanning calorimetry was chosen as the primary tool for this investigation. A method has been developed to determine the weight of PE in a suspension of crystals in a nonsolvent. Thus, a determination of X can be made. For suspension crystals, X was found to be at least 88. 5%, some 6% larger than that for the corresponding dried or freeze-dried material. Implications with regard to the fold-surface structure are discussed. Differences in degree of crystallinity as a function of drying procedure have also been observed.

Original language	English (US)
Pages (from-to)	63-71
Number of pages	9
Journal	J Polym Sci Polym Phys Ed
Volume	17
Issue number	1
State	Published - Jan 1 1979

All Science Journal Classification (ASJC) codes

Engineering(all)

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title = "HEAT OF FUSION OF POLYMER CRYSTALS: POLYETHYLENE CRYSTALS IN SUSPENSION.",

abstract = "Recent experiments have supported the view that polyethylene (PE) single crystals kept in suspension, in a variety of liquids, have different physical properties compared with the same crystals after drying. The present work was undertaken in an attempt to directly measure one of the basic properties of crystals in suspension, namely their percent crystallinity (X). Differential scanning calorimetry was chosen as the primary tool for this investigation. A method has been developed to determine the weight of PE in a suspension of crystals in a nonsolvent. Thus, a determination of X can be made. For suspension crystals, X was found to be at least 88. 5%, some 6% larger than that for the corresponding dried or freeze-dried material. Implications with regard to the fold-surface structure are discussed. Differences in degree of crystallinity as a function of drying procedure have also been observed.",

author = "Harrison, {I. R.} and J. Runt and Stanislow, {L. J.} and Bell, {D. A.}",

year = "1979",

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T1 - HEAT OF FUSION OF POLYMER CRYSTALS

T2 - POLYETHYLENE CRYSTALS IN SUSPENSION.

AU - Harrison, I. R.

AU - Runt, J.

AU - Stanislow, L. J.

AU - Bell, D. A.

PY - 1979/1/1

Y1 - 1979/1/1

N2 - Recent experiments have supported the view that polyethylene (PE) single crystals kept in suspension, in a variety of liquids, have different physical properties compared with the same crystals after drying. The present work was undertaken in an attempt to directly measure one of the basic properties of crystals in suspension, namely their percent crystallinity (X). Differential scanning calorimetry was chosen as the primary tool for this investigation. A method has been developed to determine the weight of PE in a suspension of crystals in a nonsolvent. Thus, a determination of X can be made. For suspension crystals, X was found to be at least 88. 5%, some 6% larger than that for the corresponding dried or freeze-dried material. Implications with regard to the fold-surface structure are discussed. Differences in degree of crystallinity as a function of drying procedure have also been observed.

AB - Recent experiments have supported the view that polyethylene (PE) single crystals kept in suspension, in a variety of liquids, have different physical properties compared with the same crystals after drying. The present work was undertaken in an attempt to directly measure one of the basic properties of crystals in suspension, namely their percent crystallinity (X). Differential scanning calorimetry was chosen as the primary tool for this investigation. A method has been developed to determine the weight of PE in a suspension of crystals in a nonsolvent. Thus, a determination of X can be made. For suspension crystals, X was found to be at least 88. 5%, some 6% larger than that for the corresponding dried or freeze-dried material. Implications with regard to the fold-surface structure are discussed. Differences in degree of crystallinity as a function of drying procedure have also been observed.

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