Structure and properties of chlorinated polyvinyl chloride graft copolymer with higher property

Abstract

In this work, maleic anhydride (MAH) was grafted onto chlorinated polyvinyl chloride (CPVC) with high chlorine content (66 wt%) via in-situ chlorinating graft copolymerization (ISCGC) to obtain the material with improved mechanical strength, softening point, and thermal stability of the material. The structure of the graft product (CPVC-cg-MAH) was characterized by FTIR, 1 H NMR, GPC, and UV. CPVC-cg-MAH contains less vinylidene chloride (CCl 2 ) units and double bond than corresponding CPVC. Meanwhile, the number-average molecular weight (M n ) and weight-average molecular weight (M w ) of CPVC-cg-MAH are increased, but distribution of molecular weight (M w /M n ) is decreased. Then, the tensile strength and notched impact strength of CPVC-cg-MAH increased by 14.5 and 34.6%, respectively. Furthermore, the results of DMA, DSC, TG, and Vicat softening point showed that the loss peak of CPVC-cg-MAH was higher evidently than CPVC and moved to high temperature, the glass transition temperature (T g ) of CPVC-cg-MAH was consistent with CPVC, initial weight loss temperature, and maximum weight loss rate temperature of CPVC-cg-MAH increased by 7.2-C and 6.1-C, respectively, and the Vicat softening temperature of CPVC-cg-MAH increased by 15-C and up to 130-C.

Development of Solvent-Free Offset Ink Using Vegetable Oil Esters and High Molecular-Weight Resin

“…The measurement result of the cloud point and tolerance showes that the solubility of PM 46 and 88 is lower than others. The acid value and color of the phenolic resins are unrelated to their molecular weight, whereas the softening point is raised with the molecular weight as in the previous study 14 .…”

Graft Copolymerization of Styrene‐Maleic Anhydride Onto Poly(Vinyl Chloride) and Its Cross‐linking by Toluene Diisocyanate: Characterization, Thermal, and Mechanical Properties

“…Conversely, grafted MA increases the polarity of the polymer and grafted St increases the rigidity of the polymer, which lead to increase in T g of PVC. These two contradictory effects compensate each other and determine the final thermal performance of PVC‐g‐(St‐MA) sample . The cross‐linking reactions increase the rigidity and the new introduced sections can affect T g at different manners, depending on their structures.…”

“…Maleic anhydride (MA) can contribute in many chemical reactions due to the presence of the double bonds and strong polar anhydride groups. Thus, it has been used as a general functional grafted monomer to modify polyolefines . The melt grafting reactions of MA with polyethylene, polypropylene, and polybutylene have been studied .…”

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

“…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 .…”