Thermomechanical degradation of poly(vinyl chloride)

Andersson, Kent B.; Sörvik, Erling M.

doi:10.1002/polc.5070330125

Cited by 10 publications

(1 citation statement)

References 22 publications

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“…For the binary blends of the two copolymers we have previously shown that rapid cooling leads to a single melting endotherm that is located between the melting points of the neat components, 16 which suggests cocrystallization from a miscible melt. [27][28][29] Instead, for the ternary blends we observe two melting peaks in DSC first heating thermograms of as-extruded material (Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

Click chemistry‐type crosslinking of a low‐conductivity polyethylene copolymer ternary blend for power cable insulation

Mauri

Hofmann

Gómez-Heincke

et al. 2020

Polymer International

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High‐voltage direct‐current power cables are vital for the efficient transport of electricity derived from renewable sources of energy. The most widely used material for high‐voltage power cable insulation – low‐density polyethylene (LDPE) – is usually crosslinked with peroxides, a process that releases unwanted by‐products. Hence, by‐product‐free crosslinking concepts that mitigate the associated increase in electrical conductivity are in high demand. Click chemistry‐type crosslinking of polyethylene copolymer mixtures that contain glycidyl methacrylate and acrylic acid co‐monomers is a promising alternative, provided that the curing reaction can be controlled. Here, we demonstrate that the rate of the curing reaction can be adjusted by tuning the number of epoxy and carboxyl groups. Both dilution of copolymer mixtures with neat LDPE and the selection of copolymers with a lower co‐monomer content have an equivalent effect on the curing speed. Ternary blends that contain 50 wt% of neat LDPE feature an extended extrusion window of up to 170 °C. Instead, at 200 °C rapid curing is possible, leading to thermosets with a low direct‐current electrical conductivity of about 10−16 S cm−1 at an electric field of 20 kV mm−1 and 70 °C. The conductivity of the blends explored here is comparable to or even lower than values measured for both ultraclean LDPE and a peroxide‐cured commercial crosslinked polyethylene grade. Hence, click chemistry curing represents a promising alternative to radical crosslinking with peroxides. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Click chemistry‐type crosslinking of a low‐conductivity polyethylene copolymer ternary blend for power cable insulation

Mauri

Hofmann

Gómez-Heincke

et al. 2020

Polymer International

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Thermal degradation of poly(vinyl chloride) in presence of additives part III. Studies in molecular weight distribution

Varma

Sharma

1979

Angew. Makromol. Chem.

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The changes in molecular weight and molecular weight distribution of PVC degraded in presence of maleic anhydride, benzoquinone and anthraquinone were studied by gel permeation chromatography. Chain scission and crosslinking reactions were indicated on the basis of &fn and mw of degraded samples. Crosslinking was predominant when degradation was carried out in presence of anthraquinone. ZUS AMMENFASSUNG:Veranderungen der Molekulargewichte und der Molekulargewichtsverteilung von PVC, das in Gegenwart von Maleinsaureanhydrid, Benzochinon oder Anthrachinon abgebaut wurde, wurden durch Gelchromatographie untersucht. Ketten-Spaltungs-und Vernetzungsreaktionen waren durch den mw und ml,-Wert zu erkennen. In Gegenwart von Anthrachinon waren Vernetzungsreaktionen vorherrschend.

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On the thermal degradation of poly(vinyl chloride). III. Structural changes during degradation in nitrogen

Abbås

Sörvik

1975

J of Applied Polymer Sci

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SynopsisThe structural changes in poly(viny1 chloride) during thermal degradation in nitrogen at 190OC have been investigated. From gel permeation chromatography analyses no chain scission, but only crosslinking reactions were observed. An increase in the molecular weight was measured even a t 0.3% conversion. For longer polyene sequences and at higher conversions, a crosslinking reaction competed with the "zipper" propagation. The secondary reactions were more extensive at longer polyene sequence lengths. The growing polyene sequences can be terminated not only by branching reactions but also at existing pendent chloromethylene groups. A decrease in the amount of short chain branching with conversion also indicated other types of secondary reactions. Such a decrease was also observed during thermomechanical degradation in a Brabender Plastograph. The average polyene sequence length was calculated to be around LO, depending somewhat on the type of analysis used. Although allylic chlorine atoms seem to be the main points of initiation, other sites cannot be excluded as the number of initiation points increases appreciably during the early stages of the degradation. Such an increase is, of course, also consistent with a radical mechanism.

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Thermomechanical degradation of poly(vinyl chloride)

Cited by 10 publications

References 22 publications

Click chemistry‐type crosslinking of a low‐conductivity polyethylene copolymer ternary blend for power cable insulation

Click chemistry‐type crosslinking of a low‐conductivity polyethylene copolymer ternary blend for power cable insulation

Thermal degradation of poly(vinyl chloride) in presence of additives part III. Studies in molecular weight distribution

On the thermal degradation of poly(vinyl chloride). III. Structural changes during degradation in nitrogen

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