Synthesis and Characterization of Farnesene/Isoprene Copolymerized Rubber with Different Farnesene Contents
Farnesene/isoprene copolymerized rubber with varying farnesene content was synthesized via iron coordination polymerization.The impact of farnesene dosage on polymerization reactivity,microstructure,molecular weight and glass transition temperature(Tg)was investigated.The microstructure analysis and calculation method for farnesene/isoprene copolymerized rubber were determined using quantitative carbon spectroscopy of nuclear magnetic resonance.Results demonstrated that the incorporation of farnesene monomer significantly reduced the polymerization activity,resulting in a decrease in the yield of farnesene/isoprene copolymerization ratio(3∶7)to 57％,while the yield of farnesene homopolymerization was only 32％.However,the introduction of farnesene had no significant effect on the molecular weight and molecular weight distribution,while with the increase of farnesene content of the polymer,the glass transition temperature gradually decreased,and the Tg of polyfarnesene reached-70.1℃.Furthermore,compared to polyfarnesene and polyisoprene,there was an observed increase in the proportion of 3,4 structure within the copolymerized rubber.Additionally,it should be noted that the ratios of farnesene in different copolymers were noticeably higher than their respective reaction ratios.
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