The toughness and morphology of (chlorinated poly[vinyl chloride])/(methyl methacrylate‐butadiene‐styrene) blends

Abstract

A series of methyl methacrylate‐butadiene‐styrene (MBS) graft copolymers were synthesized via seeded emulsion polymerization techniques by grafting styrene and methyl methacrylate on poly(butadiene‐co‐styrene) (SBR) particles. The chlorinated poly(vinyl chloride) (CPVC)/MBS blends were obtained by melting MBS graft copolymers with CPVC resin, and the effect of the core/shell ratio of MBS graft copolymer and SBR content of CPVC/MBS blends on the mechanical properties and morphology of CPVC/MBS blends was studied. The results showed that, with the increase in the core/shell ratio, the impact strength of the blend increased and then decreased. It was found that, when the core/shell ratio was 50/50, the impact strength was about 155 J/m, and the tensile strength evidently increased. The toughness of the CPVC/MBS blend was closely related to the SBR content of the blend, and with the increasing of SBR content of blend, the impact strength of the blend increased. The morphology of CPVC/MBS blends was observed via scanning electron microscopy. Scanning electron microscopy indicated that the toughness of CPVC/MBS blend was consistence with the dispersion of MBS graft copolymers in the CPVC matrix. J. VINYL ADDIT. TECHNOL., 22:501–505, 2016. © 2015 Society of Plastics Engineers

Predicting the lifetime of CPVC under increasing temperature and crosshead speed

“…This polymer is produced through a post-chlorination process that raises the chlorine content from 57.4% in PVC to 70% in CPVC [3]. This modification is intended to raise the glass transition temperature T g of the base resin from 95°C to 115-135°C and improves its mechanical characteristics at elevated temperatures [4]. The CPVC pipes have higher temperature and pressure rating than PVC pipes, making them suitable for hot water delivery systems and other applications requiring higher temperatures and pressure ratings [5].…”

Agglomeration of the poly(butadiene‐styrene) latex triggered by CO2bubbling and the preparation of poly(methyl methacrylate‐butadiene‐styrene) core/shell particles with a wide size distribution

“…In particular, compared to other modifiers, the MBS modifier, to some extent, can simultaneously possess the characteristics of the improved toughness and retained transparency of the PVC blends [8]. It has been demonstrated that MBS particles with the diameter <100 nm could provide the PVC matrix with excellent transparency, while the particles with the diameter >200 nm can provide the matrix with outstanding toughness [9]. Therefore, the traditional MBS latex particles with a narrow size distribution are not desirable to meet those demands.…”