Dehydrochlorination study of plasticized poly(vinyl chloride) contianing modified titanium dioxide, cerium stearate, organotin and β-diketone complex after long-term storage

Abstract

Understanding the influence of additives on the dehydrochlorination of plasticized poly(vinyl chloride) (PVC) from the source and long-term storage is an attractive topic. In this work, the effects of folic acid modified nano titanium dioxide (FANT)、cerium stearate, organotin and β -diketone compound additives on the dehydrochlorination of plasticized PVC and long-term storage were investigated using conductivity measurements. The results showed that the induction time of hydrogen chloride removal of plasticized PVC (C-1) containing composite stabilizer at 200°C were 243% higher than those of the control (S1). After storage, the heat stability of the control decreased significantly. Instead, the induction time and stability time of plasticized PVC containing FANT, cerium stearate, organotin and β- diketone composites were significantly enhanced at 200°C. The thermal stability sequence from difficult to easy for removal of hydrogen chloride was : 3.0 phr (1.90% wt) (C2) >1.0 phr (0.64% wt) (C1) > 5.0 phr (3.17% wt) (C3) with FANT. It is inferred that this is due to the FANT's hydrogen bonding van der Waals force and the complexation reaction of variable valence metal Ce+3/Ce+4 with C-Cl bond in PVC polymer molecule. The induction time (min) of hydrogen chloride removal at 200°C before and after storage is as follows: C-20 (71.9) > C-10 (70.6) > C-1 (60.7) > C-3 (57.2) > C-30 (52.7) > C-2 (49.9) > S1 (25.3) > S10 (19.7). The critical temperature for hydrogen chloride removal by the composite film is around 210°C. If the content of FANT increased to 3.17%, the intermolecular force and repulsive force in PVC system offset each other, indicating that the increase of FANT content will lead to the increase of repulsive force with PVC. A certain amount of FANT, cerium stearate, organotin and β- diketone composites has a significant synergistic effect on the thermal stability of PVC.

Preparing epoxidized vegetable oil from waste generated by the kapok fiber industry and assessing its thermal stabilization effect as a co-stabilizer for polyvinyl chloride

“…4 . The shape of the conductivity versus time graphs obtained does not differ from typical dehydrochlorination curves as presented in the literature [ 70 , 71 ]. Initially, the conductivity of water remains stable at its initial value.…”

Enhancement of Photostabilization of Poly(Vinyl Chloride) in the Presence of Tin–Cephalexin Complexes

“…PVC photodegradation results in color change, deformation, cracking, the appearance of spots, and weight loss due to the elimination of small fragments including volatiles (e.g., hydrogen chloride, HCl) [ 8 , 9 , 10 , 11 , 12 ]. The inclusion of additives during the manufacture of PVC is one way of elongating its useful life [ 13 , 14 , 15 ].…”

Effect of lanthanum on thermal and mechanical properties of modified polyvinyl chloride film

“…From the maximum residue content of L-1, it can be considered that this is one of the reasons for its strong thermal stability. In the first stage, the peak temperatures of L-1, L-2, L-3 and L-11 pyrolysis were 304.9 °C-309.7 °C, which were higher than the corresponding peak temperatures of 284.2, 292.0 and 286.9 °C reported in the literature for modification of PVC, PVCT polymerized castor oil methyl ester (S1), PVCT polymerized soybean oil (S2) and PVCT crystalline ether (S3) [34]. The peak temperatures of P-S, P-SZ and P-SZD at the first stage are 301.4, 298.7 and 297.7 °C [35] respectively.…”