Research On Conjugated Diene Rubbers Containing N-Viny-2-Pyrrolidone

The research has been carried out on butadiene rubber (BR) and isoprene rubber (IR) modified by N-Vinyl-2-pyrrolidone (NVP) in this paper. The microstructure and properties of modified products have been investigated.1. BR-g-PVP was prepared by the free radical graft copolymerization of NVP and BR. The effects of NVP/butadiene mole ratio, AIBN concentration and reaction time on degree of grafting were investigated, and the BR-g-PVP holding different grafting degrees were obtained. The structure of BR-g-PVP was confirmed by means of FT-IR, 1H NRM, XPS. The influences of grafting degree on hydrophilicity and thermal properties of BR-g-PVP were researched by means of static water contact angle measuring instrument and DSC. The physical and mechanical properties and dynamic mechanical properties were also studied on BR, BR-g-PVP and styrene-butadiene rubber (SBR) vulcanized rubbers.2. PNI was prepared by the free radical emulsion copolymerization of NVP and isoprene (IP). The influences of monomers feeding composition, initiator dosage and reaction time on yield, molecular weight and composition of PNI were investigated, and the PNI containing different NVP contents were prepared. Characterization and analysis of PNI were carried out by means of FT-IR,1H NRM, DSC and GPC. The reactivity ratio of NVP and IP were obtained by Fineman-Ross method, and they were 1.974 and 0.211 corresponding to rIP and rNVp respectively.According to rIP and rNVp,it was non ideal and non constant ratio copolymerization for IP and NVP. The hydrophilicity of PNI was investigated. The physical and mechanical properties and dynamic mechanical properties of PNI vulcanized rubber were also studied.