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 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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HEAT OF FUSION OF POLYMER CRYSTALS : POLYETHYLENE CRYSTALS IN SUSPENSION. / Harrison, I. R.; Runt, James Patrick; Stanislow, L. J.; Bell, D. A.
In: J Polym Sci Polym Phys Ed, Vol. 17, No. 1, 01.01.1979, p. 63-71.Research output: Contribution to journal › Article
TY - JOUR
T1 - HEAT OF FUSION OF POLYMER CRYSTALS
T2 - POLYETHYLENE CRYSTALS IN SUSPENSION.
AU - Harrison, I. R.
AU - Runt, James Patrick
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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M3 - Article
AN - SCOPUS:0018287085
VL - 17
SP - 63
EP - 71
JO - Journal of polymer science. Part A-2, Polymer physics
JF - Journal of polymer science. Part A-2, Polymer physics
SN - 0449-2978
IS - 1
ER -