Preparation of anhydridized chlorinated polyvinyl chloride with enhanced properties and investigation of the factors affecting the chain structure of the graft copolymer

Abstract

A graft copolymer, composed of maleic anhydride as side group and chlorinated polyvinyl chloride as backbone, was prepared via in situ chlorinating graft copolymerization. The effect of graft degree of the graft copolymer on the chain structure is discussed through proton nuclear magnetic resonance. The results of differential scanning calorimetry and thermogravimetic analysis showed glass transition temperature of the graft copolymer did not change with increase in graft degree, but thermal stability of the product improved much with increase in graft degree. The results of gel content measurements showed the increasing graft degree was favorable to prevent cross-linking reaction of the product.

Structure and solubility of chlorinated poly(vinyl chloride) prepared by a gas–solid phase method

“…Thus, the structure of CCl 2 CHCl was easily generated with the increase of chlorine content that resulted in the increase of the structure content. PVC chlorination first occurred on the PVC particle surface and diffused in the interior of the particles . The concentration of chlorine radicals in the reaction system and the reaction change on the surface of PVC particles were large when the reaction temperature and chlorine flow rate were large.…”

“…Chlorinated poly(vinyl chloride) (CPVC) resins are the product of PVC chlorination . Their excellent corrosion resistance, high effect resistance, tensile strength, and excellent performance as coatings and adhesives have attracted wide attention locally and globally .…”

Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review

“…Chlorine radicals can be generated from chlorine gas by a homolytic reaction or released from chlorine-containing polymers by thermal decomposition, polyvinyl chloride for example. 98 The chlorine radicals substitute the hydrogen on the side chain of the aromatic ring to form chlorinated aromatic hydrocarbons. As the reaction temperature increases, the chlorine atoms on the chlorinated aromatic hydrocarbons combine with the hydrogen atoms on other aromatic molecules during dechlorination to form hydrogen chloride, which is then purged from the reaction system by passing an inert gas.…”

Covalent Functionalizations of Poly(vinyl chloride) in Tune with Applications: An Update

“…Grafting of maleic anhydride (MAH) onto polymer matrixes was thoroughly reviewed by Rzayev [102]. In the aim at upgrading the mechanical strength, the softening point, and the thermal stability of chlorinated PVC (CPVC), Zhao and his collaborators [103,104] modified CPVC by grafting with polymer of maleic anhydride (PMAH) through an in situ chlorinating graft copolymerization. For this purpose, a mixture of PVC/maleic anhydride in acetone was flushed with chlorine gas for 15 min at a temperature of 50-60 °C (Eq.…”