Liucheng Zhang

Study on the properties, morphology, and applications of castor oil polyurethane—poly(methyl methacrylate) IPNs

A series of castor oil polyurethane—poly(methyl methacrylate) interpenetrating polymer networks (IPN COPU/PMMA) were produced from castor oil, toluene diisocyanate, and methyl methacrylate. The properties and morphology of the IPNs were estimated. The adhesives based on the IPN COPU/PMMA prepolymer were prepared and the influence of the composition on the adhesion strength was studied. The experimental results showed that the adhesives have an effective adhesive power for metals and these adhesives have good prospects in a practical project.

THERMOANALYSIS AND MECHANICAL PROPERTIES OF EMULSION COPOLYMER POLY(MMA-PMI-ST)

Terpolymers of methyl methacrylate (MMA), N-phenylmaleimide (PMI) and styrene (St) were synthesized by emulsion copolymerization. The glass transition temperatures (Tg) and the thermostability of copolymers were determined by differential scanning calorimetry (DSC) and programmed thermogravimetric analysis (TGA), respectively. The terpolymers show a considerable increase in decomposition temperature, activation energy of decomposition and Tg with increasing content of PMI. Furthermore, the Vicat softening points of the terpolymers rise with PMI content. The mechanical properties (tensile strength and impact strength) of the terpolymers decrease with increasing PMI content and increase insignificantly with increasing St content.