Crystallinity in chemically crosslinked low density polyethylenes: 1. Structural and fusion studies

Kao, Y.H.; Phillips, Peter

doi:10.1016/0032-3861(86)90260-0

Cited by 88 publications

(65 citation statements)

References 19 publications

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“…In contrast, for the VEV triblocks shown in Figure 13b, the PE chains are topologically constrained, unable to rearrange into large crystallites due to the tethering of the chain at both ends. In terms of effects on crystallite size (as reflected by a reduction in T m ), a direct analogy can be made between junction points in crosslinked polymers 9,[12][13][14][15] and topological constraints in infinite domain width VEV.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Crystallization of tethered polyethylene in confined geometries

Weimann

Hajduk

Chu

et al. 1999

J. Polym. Sci. B Polym. Phys.

105

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Section: Discussionmentioning

confidence: 99%

“…9,[12][13][14][15] The magnitude of reductions in these parameters generally increases with increasing crosslink density, presumably because of retarded chain mobility and restrictions on crystallite size resulting from decreased chain length between junction points.…”

Section: Introductionmentioning

confidence: 98%

Crystallization of tethered polyethylene in confined geometries

Weimann

Hajduk

Chu

et al. 1999

J. Polym. Sci. B Polym. Phys.

105

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“…Sen and colleagues 3,4 reported some kinetics data, studied by differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and dynamic mechanical analysis (DMA), on silane grafting and moisture crosslinking of polyethylene and ethylene propylene rubber. Kao and Phillips 5 reported the crystallinity and other structural information, using DSC and XRD, of low-density polyethylene (LDPE) crosslinked by dicumyl peroxide. Hjertberg and colleagues 2 and Bullen and colleagues 6 studied the crosslinking reactions of ethylenevinyl trimethoxysilane copolymers.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of silane-grafted water-crosslinked polyethylene

Shieh

Hsiao

1998

J. Appl. Polym. Sci.

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Vinyl trimethoxysilane grafting reactions of low-density polyethylene (LDPE) were performed in an extruder, followed by crosslinking with boiled water. The thermal properties of both silane-grafted and silane-grafted water-crosslinked LDPE were investigated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). DSC data showed that the silane grafts on the LDPE molecules were thermal stable in the absence of moisture under 130°C under which the silane-grafted LDPE could be processed or recycled. The silane grafts on the LDPE molecules reduced the melting point of LDPE and gave rise to an endotherm shoulder at about 85°C. TGA data showed that the decomposition temperature of the silane-grafted LDPE was much higher than that of LDPE. It was demonstrated that the cause of the increase in the decomposition temperature was not due to the silane grafts but due to the peroxideinduced crosslinking reactions during the silane grafting reactions performed in an extruder. Silane-grafted water-crosslinked LDPE displayed multiple melting behavior resulting from phase separation during crosslinking of LDPE with water. The phase separation gave rise to two melting points, including one at about 94°C, and the other at about 107°C.

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“…11 Another possibility is that the incorporation of crosslinks into the system results in stress along the crystallizing chain which opposes the incorporation of additional members of the same chain and thereby limits the initial length of the chain that can be incorporated into the crystal and/or the extent of the thickening process. 12 However, the problem of the decrease in the crystallinity of PE due to crosslinking is not compeletly understood; some authors have tried to correlate the change in entropy of fusion with the increase in the crosslinking and the variation in lamellar thickness. The decrease in lamellar thickness has been clearly detected by polarization microscopy.…”

Section: Melting Point Of Pementioning

confidence: 99%