Poly(vinyl chloride) thermal stability. I. Evaluation by melt rheology

Collins, E. A.; Krier, Charles A.

doi:10.1002/app.1966.070101014

Cited by 10 publications

(2 citation statements)

References 15 publications

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“…The latter phenomenon can be explained by assuming a loss of volatile products containing carbonyls. The above results are in very good agreement with those obtained by Collins and Krier [20] from capillary rheometer tests at 21OoC. The Ba-Cd stabilized low molecular weight sample PEVIKON R-150 (A3) showed a decrease in tacticity after 12 min, but it was not as fast as for the corresponding B-sample (B3).…”

Section: Infrared Measurementssupporting

confidence: 89%

Thermomechanical degradation of poly(vinyl chloride)

Andersson

Sörvik

1971

J. polym. sci., C Polym. symp.

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SYNOPSISThe thermomechanical degradation of stabilized and unstabilized poly (vinyl chloride) VVC) has been investigated by use of a Brabender Plastograph. All degraded samples were analyzed by gel permeation chromatograph (CPC) and some of them were studied by infrared measurements and viscometry. The association of PVC molecules seemed to affect the CFT measurements for weight average molecular weights exceeding about 70,000. The heat treatment of solutions of degraded PVC before fractionating by GPC was very important in order to obtain real values of Gw.After the degradation point was reached, the BaCd stabilized samples showed a faster increase in Mw than the Sn stabilized or the unstabilized samples did.The emulsion polymer had not as good stability as the corresponding suspension polymer, presumably due to its larger content of remaining polymerization additives. No noticeable chain scission occurred for the low molecular weight PVC, PEVIKON R-150. This polymer also showed a very slow increase in BW when treated without any stabilizer. The average number of trifunctional branch units per molecule was found to be only 0.3 for PEVIKON R-150 and 0.5 for PEVIKON R-341, but increased during the degradation. The agreement between the results from the GF' C, viscometry, Brabender tests, and the infrared measurements are excellent.

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Section: Infrared Measurementssupporting

confidence: 89%

Thermomechanical degradation of poly(vinyl chloride)

Andersson

Sörvik

1971

J. polym. sci., C Polym. symp.

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“…The dynamic stability of the PVC compositions was investigated at 200 °C using the torque rheometer technique [18][19][20] on a Haake Polylab OS with Rheomix 600p OS Lab Mixer using roller rotors. The plastisol paste mixture (70 g) was loaded into the internal mixing chamber.…”

Section: Dynamic Heat Stability (Rheomix)mentioning

confidence: 99%

Heat stabilising flexible PVC with layered double hydroxide derivatives

Labuschagne

Molefe

Focke

et al. 2015

Polymer Degradation and Stability

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The layered double hydroxide ([Mg 0.667 Al 0.333 (OH) 2 ](CO 3 ) 0.167 ·mH 2 O) (LDH) has found application as a heat stabiliser for PVC. Derivatives of this compound were synthesised using a hydrothermal method. Emulsion grade PVC was plasticised with 100 phr diisononyl phthalate and stabilised with 30 phr of the LDH filler additives. Heat stabilities were determined at 200 C. The dynamic heat stability tests were performed on the plastisols using the torque rheometer method. Static heat stability was evaluated on the fused compounds. It was evaluated from discoloration profiles of strips exposed for various lengths of time to heat in a Metrastat oven. The time dependence of hydrogen chloride evolution was followed with a Metrohm Thermomat instrument. The conventional LDH provided the best dynamic heat stability. However, partial replacement of the magnesium with copper significantly delayed the release of volatile HCl. If instead the replacement was done using zinc, better colour retention was achieved.

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