Chemical modification of PVC

Abstract

The degradation of PVC at a processing temperature is mostly caused by its abnormal and unstable molecular structures. It .has been pointed out that its allyl chloride structures play a significant role as the abnormal and unstable structures. Inasmuch as the allyl chloride structures are markedly more chemically active than the normal structure, the selective chemical treatments are applicable to the allyl chloride structures. The thermal stability of .PVC can be remarkably improved by treating PVC with certain organo-aluminium compounds or protic solvente. Concretely, the results of analyzing the reaction mechanism with the low molecular model compounds of PVC or .the tracer show that the selective stabilizing reaction on the allyl chloride structure takes place. On the other hand, the improvement of the. mechanical properties of PVC, such as softening temperature, rigidity, anti-creep property, impact strength and tensile strength, is important for practical applications of PVC.

Synthesis, characterization and investigation of dielectric properties of two-armed graft copolymers prepared with methyl methacrylate and styrene onto PVC using atom transfer radical polymerization

“…Modification of PVC can generally be achieved by nucleophilic substitution reactions of chlorine atoms as an appropriate method of improving properties [2]. Modifications of PVC with many nucleophiles, such as I À , SCN À , OH À , N À 3 and phthalimide anion [3], pyrazole, 3,5-dimethylpyrazole and 2-mercaptobenzimidazole [4], 1,4-phenylenediamine [5], ethylenediamine [6], potassium ethyl xanthogenate [7], amino thiophenol [8], were studied.…”

Synthesis of PVC-graft-PMMA Through Stereoselective Nucleophilic Substitution on PVC

“…[31] IR (film): 1 010 cm -1 (1O1CS1S1). 1 H NMR (200 MHz): d = 2.5 (CH 2 ), 3.7 ppm (1O1CH 2 1), 4.6 (CHCl).…”

“…[1] The most common reactives used in the reaction with PVC are different types of organic sulfur compounds. [2 -14] Some of these have been found to be an effective initiator for radical thermal or photopolymerization which can be used to prepare graft copolymers.…”

Aminosilane grafting of plasticized poly(vinyl chloride) I. Extent and rate of crosslinking

“…solution and in the condensed state. [1][2][3][4][5] Duchacek and Kuta 13 have crosslinked PVC by tetramethyl-thiuramdisulphide in the presence CHEMICAL CROSSLINKING of zinc oxide. They found the activation energy for Modification of PVC by crosslinking has aroused the crosslinking reaction to be 106 KJ mol.…”