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              Highly Efficient Method to Synthesize Ultra-high Molecular Weight Polyisoprene Rubber

              Jul 22, 2020

              Branched ultra-high molecular weight polydiene rubbers possess remarkable mechanical properties, such as high tensile strength, high wet-slip resistance and high damping performance. They are applied in high-performance tires and noise-reducing materials.  

              However, efficient and precise synthetic approach of the ultra-high molecular weight rubber is still a thorny subject, which limits its preparations and applications. 

              Recently, a research group led by Prof. WANG Qinggang from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences proposed a highly efficient strategy to synthesize ultra-high molecular weight branched polyisoprene rubber, utilizing a novel asymmetric binuclear chlorinated bridge iron catalyst.

              The study was published in Chemical Communications on June 24.

              The chloride-bridged unsymmetrical complexes consisted of mixed Fe(II)-HS/Fe(II)-LS binuclear structures, and exhibited extremely high catalytic efficiency, with 1 g catalyst being enough to produce 30 Kg polyisoprene rubber (Mn = 1.8 × 106 g/mol).

              The resulting polyisoprene rubber had superior green strength and elongation at break, showing potential industrial application prospects.  

              The research was supported by the Major Science and Technology Innovation Program of Shandong Province, '135' Projects Fund of CAS-QIBEBT Director Innovation Foundation, the DICP& QIBEBT United Foundation, and the National Natural Science Foundation of China.

              An Unsymmetrical Binuclear Iminopyridine-iron Complex and Its Catalytic Isoprene Polymerization

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