A recycling assessment of PVC bottles by means of heat impact evaluation on its reprocessing

Abstract

Poly(vinyl chloride) (PVC) products are very convenient for reclaiming and recycling. Therefore, the heat impact at 160-180ЊC temperature during the recycling process was investigated in the current study by means of spectroscopic studies, such as infrared and ultraviolet, and of differential scanning calorimetry curves. The bottle samples are slightly and considerably affected at 160 and 180ЊC heat treatments, respectively, which were determined as the formed decomposition products, color change, loss of volatile components, and peroxide formation in air. However, since this decomposition occurred at 30 min of experimental time, which is about sixfold that of real process times, the reclaimed material found recyclable as is. Judicious recomposition of the powdered reclaimed material making up the lost or consumed component makes possible the use of this material in the production of window sections, profiles, pipes, and even bottles.

Processability, rheology, and thermal, mechanical, and morphological properties of postconsumer poly(vinyl chloride) bottles and cables

“…The impact strength and processing behavior of the virgin PVC were improved with the addition of the recycled PVC because of the presence of modifier agents in the recycled PVC pipes (RPs), whereas the thermal resistance was slightly lowered. Ulutan 5 conducted spectroscopic studies (e.g., IR and ultraviolet) and differential scanning calorimetry (DSC) for RBs heated at 160 -180°C. The recycled PVC was considerably affected by a 180°C heat treatment, this being indicated by color changes, the loss of volatile components, and the formation of decomposition products.…”

Analytical Methods

“…• degree of gelation and fusion, [69][70][71] • melting point of stearates and consequently effect on their properties, 72 • melting point determination of stabilizers, 73 • effect of plasticizer addition and loss on glass transition temperature, [74][75] • stabilizer distribution in polymer blend, 76 • decomposition and concentration of azodicarbonamide and performance of kickers, 77,78 • decomposition of epoxidized soybean oil, 79 • crystallinity of PVC, 80,81 • glass transition temperature of PVC, 82,83 • gauging the mechanically induced stress in PVC when oriented below glass transition temperature, 84 • cis/trans isomerization, 85 • activation energy of thermooxidative degradation, 86 • oxidative induction time. 87 …”

“…297 The solution method has two important limitations. 72 The major application of UV-vis spectroscopy is in UV degradation studies and determination of polyene formation (analysis of long, short, total, and distribution of polyenes). 198 Studies of UV-visible spectrum with a sample in the form of film are also common.…”

Recent Advances in the Chemical Recycling of Polymers (PP, PS, LDPE, HDPE, PVC, PC, Nylon, PMMA)

“…As it is well-known PVC incineration is connected with problems arising from the high chlorine content of this polymer which yields large amounts of hydrochloric acid (HCl) during thermal decomposition, beside the possibility of formation of persistent and toxic compounds such as toxic dioxines and furans (Garcia et al, 2007;Ulutan, 1998;Ali and Siddiqui, 2005). In addition, when PVC wastes are fired in an incinerator, HCl corrodes the boiler tubes of the incinerator and other equipments.…”