Abstract
This study investigated the viscoelastic and rheometeric properties of PVC stabilized with tannin-Ca complex as totally bio-based thermal stabilizer. Dynamic mechanical thermal analysis (DMTA) used to characterize the viscoelastic properties of PVC samples obtained by thermal mixing of PVC with three composition percentages (1.0, 2.0, and 3.0) part per hundred ratios (phr) of tannin-Ca complex with this polymer. The torque rheometery test used to monitor the effect of tannins derivative on the thermal stability and mixing properties of PVC formulations during samples processing. For that purpose, PVC sample with 2 phr commercial thermal stabilizer (Reapak B-NT/ 7060) was used for comparison and considered as reference samples. Before the glass transition temperature of PVC at 30°C - 60°C, the DMTA curves show that the values of storage modulus and tan delta of PVC samples stabilized with tannin derivative were very similar with those of PVC sample stabilized with commercial thermal stabilizer. The glass transition temperature (Tg) of PVC stabilized with commercial thermal stabilizer and with tannin-Ca complex occurred at about 76°C. In a sequence, after the glass transition region of PVC samples, the DMTA scans confirmed that the PVC samples with 2 phr tannin-Ca complex have relatively longer flowing stage which occurs at lower temperatures by 18°C per that of PVC sample stabilized with commercial stabilizer. Global results of the torque rheometery which have suitable plateau stages and the DMTA show that the processing thermal stability and thermal flexibility of PVC are clearly increased with the incorporation of tannin-Ca complex. All the PVC formulations with tannins-Ca complex show excellent viscoelastic properties which were found to be slightly best or much closed to those obtained for PVC stabilized with commercial thermal stabilization.
Highlights
Polyvinyl chloride, PVC is one of the main components of modern commodity thermoplastic polymers used for various applications
Thermal stabilizers play a key role in the PVC formulations and processing
The thermal properties of PVC containing tannin-Ca complex in the absence of commercial thermal stabilizer were investigated in this study; generally, all the results indicate that the tannin-Ca can clearly improve the thermal stability and viscoelastic properties of PVC; this is mainly due to the action of tannin derivative as HCl trap and as antioxidants
Summary
PVC is one of the main components of modern commodity thermoplastic polymers used for various applications. PVC can be manufactured in a range of flexibilities and rigidities. It can be used in a wide range of temperatures, and it retains its strength and durability at low temperatures. PVC formulations exhibit excellent strength and toughness, exhibit very good water, fire and chemical resistance and stability, and are biocompatible for some applications. PVC is relatively lower cost and high-performance value and it has safety and cost advantages for a wide variety of medical applications, especially for single-use disposable devices [1] [2]
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