scholarly journals Construction of chain segment structure models, and effects on the initial stage of the thermal degradation of poly(vinyl chloride)

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37268-37275 ◽  
Author(s):  
Yin Lv ◽  
Jia Liu ◽  
Zhidong Luo ◽  
Heyun Wang ◽  
Zhong Wei
Keyword(s):  
Thermal Degradation ◽  
Vinyl Chloride ◽  
Chain Segment ◽  
Poly Vinyl Chloride ◽  
Initial Stage ◽  
Dehydrochlorination Reaction

Comparing two models, the dehydrochlorination reaction of PVC was predominantly initiated at the internal allylic chlorine sites, further promoting degradation.

scholarly journals Synthesis, characterization and Stydy thermal stabilization effect of calcium complex of anthocyanin on the poly (vinyl chloride)

2021 ◽  
Vol 2063 (1) ◽  
pp. 012005
Author(s):  
Hikmat A Ali ◽  
Hussein A Shnawa ◽  
Dhiaa A Abidalimam
Keyword(s):  
Thermal Degradation ◽  
Vinyl Chloride ◽  
Thermal Stabilization ◽  
Mixing Ratio ◽  
Scanning Calorimetry ◽  
Thermal Stabilizer ◽  
Poly Vinyl Chloride ◽  
Stabilization Effect ◽  
Degradation Reaction ◽  
Dehydrochlorination Reaction

Abstract In this study, calcium complex of anthocyanin was synthesized from anthocyanin, a flavonoid type natural phenolic product, which was extracted from eggplant peel. The structure of Ca-anthocyanin was characterized by FTIR spectroscopy. Its efficiency as bio-based thermal stabilizer to stabilize poly (vinyl chloride) was investigated and compared to that of Reapak B-NT/7060, a Ca/Zn-based commercial stabilizer. The influence of Ca-anthocyanin complex on the thermal degradation reaction of PVC was monitored by differential scanning calorimetry (DSC). The results indicated that the Ca-anthocyanin complex is an efficient thermal stabilizer and it reduces the rate of dehydrochlorination reaction of PVC already at a concentration as small as 2 phr, part per hundred of PVC resin. The thermal degradation reaction of PVC through the first degradation stage is clearly limited by the addition of Ca-anthocyanin complex as single (primary) stabilizer. Its efficiency is similar to that of Reapak B-NT/7060 used as reference stabilizer and it can enhance the performance of commercial stabilizer when used as co-stabilizer at mixing ratio (1:1). This study has allowed verifying and validating the usefulness of environmental friendly thermal stabilizer for PVC with very evident stabilization effect.

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