Journal
POLYMER DEGRADATION AND STABILITY
Volume 97, Issue 4, Pages 584-591Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2012.01.009
Keywords
Poly(vinyl chloride); Dehydrochlorination; Zinc(II) oxide; Cross-linking
Categories
Funding
- MEXT
- JST-ALCA
- JST-A Step
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Characteristics of low temperature (473 K) dehydrochlorination of PVC powder in the presence of ZnO were studied in nitrogen flow and a reaction mechanism was proposed. It was revealed that a large portion of chlorine (ca. 70%) in PVC powder reacts with ZnO accompanying evolution of water and a slight amount of HCl (ca. 0.5%) without any organic gas. Analysis of the solid product by SEM, XRD and IR suggested that an apparent solid-solid reaction proceeds at 473 K via formation of a liquid phase which acts as reaction promoter and that the solid product is abundant in aliphatic (CH)(n) polymer. It was concluded that the first step of the dehydrochlorination is cross-linking C-C single bond formation in a polymer chain or among polymer chains followed by isomerization to polyene and aromatics. (C) 2012 Elsevier Ltd. All rights reserved.
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