Characterization of Recovered Polyvinylchloride by Size Exclusion Chromatography and Triple Detectors Technique.
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| Title: | Characterization of Recovered Polyvinylchloride by Size Exclusion Chromatography and Triple Detectors Technique. |
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| Authors: | Hamidi, Nasrollah1 (AUTHOR) Nhamidi@scsu.edu |
| Source: | Journal of Macromolecular Science: Physics. 2020, Vol. 59 Issue 3, p137-156. 20p. 4 Charts, 6 Graphs. |
| Subjects: | Gel permeation chromatography, Chromatographic detectors, Benzyl alcohol, Polyvinyl chloride, Solvent extraction |
| Abstract: | Polyvinyl chloride (PVC) is an indispensable compound that accounts for 66% of the water distribution infrastructure and 75% of sanitary sewer pipe applications in the U.S.A. In this study PVC resin was recovered by solvent extraction from a postconsumer PVC pipe. The recovered PVC (PVC-R) was characterized by a multi-detector size exclusion chromatography system eluted with tetrahydrofuran (THF) at 30 °C. The values of the Mark-Houwink-Kuhn-Sakurada (MH) parameters of the PVC-R were obtained by averaging three replicable experiments and the results were comparable with the reported values of pure PVC. The Stockmayer-Fixman plot of the PVC-R in THF had a curved shape which is due to the notorious tendency of the PVC molecules to remain partly associated in supermolecular aggregates even if the PVC is dissolved in a good solvent. As a results, the unperturbed molecular dimension, R ¯ 0 2 / M ¯ w 1/2 , of the PVC-R was dependent on a function of the excluded volume, z, where the z2 coefficient was not zero. The obtained value of the R ¯ 0 2 / M ¯ w 1/2 of PVC-R, having a M ¯ w = 87 kDa and M ¯ w / M ¯ n = 1.41, was 8.19 × 10−9 (cgs), comparable with the reported value for pure industrial PVCs in THF, 6.4 kDa < M ¯ w < 650 kDa at 25 °C, 8.17 × 10−9 (cgs) and in benzyl alcohol, an ideal solvent, at 155.4 °C, 40 kDa < M ¯ w < 350 kDa, 8.20 × 10−9 (cgs). The comparison of the results showed that the PVC-R had similar characteristics to the industrial PVC reported in the published literature, and hence can be reused as a resin for the manufacturing of PVC commodities. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Polyvinyl chloride (PVC) is an indispensable compound that accounts for 66% of the water distribution infrastructure and 75% of sanitary sewer pipe applications in the U.S.A. In this study PVC resin was recovered by solvent extraction from a postconsumer PVC pipe. The recovered PVC (PVC-R) was characterized by a multi-detector size exclusion chromatography system eluted with tetrahydrofuran (THF) at 30 °C. The values of the Mark-Houwink-Kuhn-Sakurada (MH) parameters of the PVC-R were obtained by averaging three replicable experiments and the results were comparable with the reported values of pure PVC. The Stockmayer-Fixman plot of the PVC-R in THF had a curved shape which is due to the notorious tendency of the PVC molecules to remain partly associated in supermolecular aggregates even if the PVC is dissolved in a good solvent. As a results, the unperturbed molecular dimension, R ¯ 0 2 / M ¯ w 1/2 , of the PVC-R was dependent on a function of the excluded volume, z, where the z2 coefficient was not zero. The obtained value of the R ¯ 0 2 / M ¯ w 1/2 of PVC-R, having a M ¯ w = 87 kDa and M ¯ w / M ¯ n = 1.41, was 8.19 × 10−9 (cgs), comparable with the reported value for pure industrial PVCs in THF, 6.4 kDa < M ¯ w < 650 kDa at 25 °C, 8.17 × 10−9 (cgs) and in benzyl alcohol, an ideal solvent, at 155.4 °C, 40 kDa < M ¯ w < 350 kDa, 8.20 × 10−9 (cgs). The comparison of the results showed that the PVC-R had similar characteristics to the industrial PVC reported in the published literature, and hence can be reused as a resin for the manufacturing of PVC commodities. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00222348 |
| DOI: | 10.1080/00222348.2019.1696402 |
