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Cser, F.; Hopewell, Jefferson L.; Tajne, K.; Shanks, Robert A.

doi:10.1023/a:1010112206826

Cited by 8 publications

(9 citation statements)

References 12 publications

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“…We found that the heat capacities reached their minimum value within 1–3 min. The peak temperature of the next maximum in the endotherm increased by 2 K with respect to the same peak measured during a simple melting cycle 10. The endotherm peak at the highest temperature was also shifted by 2–3 K to higher values with respect to its original position in the TF sample.…”

Section: Introductionsupporting

confidence: 49%

“…Neither the comonomer content, nor the molecular weight data are given for C4‐LLDPE. These latter polymers should have higher polydispersity than the C8‐LLDPEs, as they showed sharper melting endothermic peak with a much broader secondary crystallization 10…”

Section: Methodsmentioning

confidence: 99%

“…In our previous works,5, 10 DSC and temperature‐modulated DSC (TMDSC) data were presented that had been obtained on LDPE, LLDPE, high density polyethylene (HDPE), and isotactic polypropylene on samples crystallized by stepwise cooling using 3‐K steps. Each step was followed by a 50‐min isothermal period.…”

Section: Introductionmentioning

confidence: 99%

“…TF samples have also been reverse annealed in a TMDSC 10. Reverse annealing means a series of heating/cooling cycles performed in TMDSC.…”

Section: Introductionmentioning

confidence: 99%

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X‐ray diffraction studies on reverse‐annealed polyethylenes

Cser

Hopewell

Shanks

2001

J of Applied Polymer Sci

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Linear low and high density polyethylene sheets were compression molded and crystallized at a 5-10°C/min cooling rate. Parts of the sheets were annealed at different temperatures up to 2°C below the melting temperature. The small angle X-ray scattering (SAXS) and the wide angle X-ray scattering intensities of the annealed samples were studied. SAXS intensities showed particle scattering with a bimodal size distribution. The estimated radii of gyration were 15-17 nm and 5-7 nm, respectively. The crystallinity and the radius of gyration increased slightly with increasing annealing temperature for some samples; others did not show any change. No peaks characteristic of intercorrelated lamellar crystallinity in the SAXS intensities developed during the annealing. The original broad peak of high density polyethylene disappeared from the SAXS recordings on annealing. The length of the perfect chain versus melting temperature was calculated by the Thomson-Gibbs formula and Flory's concept of melting temperature depression where methyl groups and tertiary carbon atoms at the branches were regarded as second components (solvent). Linear relationships were found for both cases. Experimental data for a linear low density polyethylene obtained from the literature were in between the two functions. A lamellar model of crystallization corresponding to the data is proposed.

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Section: Introductionsupporting

confidence: 49%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…TF samples have also been reverse annealed in a TMDSC 10. Reverse annealing means a series of heating/cooling cycles performed in TMDSC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X‐ray diffraction studies on reverse‐annealed polyethylenes

Cser

Hopewell

Shanks

2001

J of Applied Polymer Sci

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“…[14][15][16][17][18][19][20][21][22] Mu †ller and Arnal 23 summarized these results and they observed that, in thermal fractionation, the polymer chains are never physically separated, and therefore the technique is sensitive to linear and uninterrupted chain sequences. This implies that thermal fractionation is equally sensitive to both intra-and intermolecular defects.…”

Section: Introductionmentioning

confidence: 99%

Thermal fractionation and properties of different polyethylene/wax blends

Hato

Luyt

2007

J of Applied Polymer Sci

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The influence of paraffin-wax type and content on the properties of its blends with HDPE, LDPE, and LLDPE was investigated. Melt-mixing of HDPE with wax gave rise to completely miscible blends for both 10 and 20% wax contents. A wax content of 30% gave rise to a partially miscible blend. These observations were supported by the thermal fractionation (stepwise cooling) results. Melt-mixing of LDPE with hard paraffin wax gave rise to a partially miscible blend for all wax contents investigated, while complete miscibility was observed for the 10% oxidized hard paraffin wax containing blend. Complete miscibility was observed for all the LLDPE/A1 wax blends, with A1 wax as an oxidized hard paraffin wax. This indicates possible cocrystalli-zation of this wax with LLDPE, which was also evident from the thermal fractionation curves. LLDPE blends with hard paraffin wax were, however, partially miscible for all wax contents. All the observations were supported by the surface free energy results. It is further clear from the thermal fractionation results that the presence of wax changed the crystallization behavior of LDPE and LLDPE. Changes in the tensile properties are explained in terms of the miscibility and proposed morphologies of the blends.

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