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Synergistic Modification of PVC with Nitrogen-Containing Heterocycle and Tung-Oil Based Derivative for Enhanced Heat Stabilization and Plasticization Behavior
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Researchers developed nitrogen-containing and tung-oil-based additives to improve the thermal stability and flexibility of PVC while reducing migration of chemicals out of the material, addressing a key concern about PVC as a source of environmental contaminants.
The additives present in polyvinyl chloride (PVC) materials are the major source of organic by-products during PVC degradation. The thermal stabilizer and plasticizer are the main additives that endow PVC with the required properties during its processing. However, these two additives easily migrate when samples are obtained by physical mixing of the additives with PVC. This causes the reduction of PVC sample efficacy and the increase in the formation of organic by-products in the radiolysis process. In this work, two kinds of grafted PVC samples (tung-oil derivative grafted PVC and Atz grafted PVC, abbreviated as P-GT4 and P-AZ3) were synthesized by chemical grafting of 3-amino-1,2,4-triazole (Atz) and tung-oil derivative on PVC, respectively. These two PVC samples were then blended at different mass ratios to obtain hybrid PVC materials with excellent plasticization, thermal stability and migration resistance ability. Differential scanning calorimetry (DSC), discoloration, Congo red test and thermogravimetric analysis (TGA) showed that when the mass ratio of P-GT4 to P-AZ3 in the mixed PVC resin was 1:3, the resulting P1:3-GT4-AZ3 (P4) presented the best plasticization and thermal stability. The kinetics of thermal decomposition showed that the activation energy of P4 was much higher than that of the reference material [PVC/DOTP/CaSt2/ZnSt2, PVC/CZ41 for short] at mass loss α = 20% and 80%. In addition, the leaching test showed that P4 material possessed excellent migration resistance ability.
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Researchers reviewed plant oil-derived stabilizers as green chemistry alternatives to toxic lead and organotin compounds traditionally used in PVC manufacturing, finding that bio-based additives can enhance PVC thermal stability while reducing environmental and health risks associated with conventional plastic stabilizers.
Risks Associated with the Presence of PVC in the Environment and Methods of Its Elimination
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This review summarized the environmental risks posed by polyvinyl chloride (PVC) plastics, including the release of toxic additives and microplastic formation during degradation, and assessed current methods for its elimination from the environment.
Non-migrating PVC plasticizers based on oligocaprolactones obtained by ring-opening polymerization
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Researchers developed a new class of plasticizers for PVC plastic that chemically bond to the polymer chain instead of sitting loose within it, preventing the common problem of plasticizer migration (leaching out over time) — a safer and more durable approach to making flexible plastic products.
Development of High-Efficiency Hybrid Plasticized Polyvinyl Chloride Paste Resin and Its Derived High-Performance Foam
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Scientists tweaked the recipe for PVC plastic (commonly used in flooring, foam padding, and other products) by building a softening ingredient directly into the plastic's molecular structure, instead of just mixing in separate chemical plasticizers. This matters because traditional plasticizers can leach out of PVC products over time and contaminate homes, food, or bodies—so a version that needs fewer added plasticizers, or none migrating out, could mean safer, more durable plastic foam products made with less energy too.
Synthesis of New Norfloxacin–Tin Complexes to Mitigate the Effect of Ultraviolet-Visible Irradiation in Polyvinyl Chloride Films
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Researchers synthesized novel norfloxacin-tin complexes and evaluated their effectiveness as photostabilizing additives for polyvinyl chloride films, finding that the organotin compounds significantly reduced photodegradation of PVC under ultraviolet-visible irradiation.
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