High transparent alternate copolymer of norbornene with isoprene catalyzed by bis(phenoxy-imine) titanium complex

作者：Meng, Jia-Feng; Li, Xin; Ni, Xu-Feng^*; Shen, Zhi-Quan

来源：RSC Advances, 2016, 6(23): 19351-19356.

DOI：10.1039/c5ra26641f

• OLEFIN POLYMERIZATION CATALYSTS
• ADDITION POLYMERIZATION
• HALF-TITANOCENES
• LIGANDS
• ETHYLENE
• BEARING
• HOMOPOLYMERIZATION
• PROPYLENE
• SYSTEM
• NI(II)

A novel highly transparent alternate copolymer of norbornene with isoprene was prepared using a coordination catalytic system composed of bis(phenoxy-imine) titanium complexes and triisobutylaluminum. Distortionless enhancement by polarization transfer C-13 NMR microstructure analysis of the copolymer reveals the vinyl-type addition nature of norbornene in the copolymer. The content of norbornene in the copolymer stayed constant at approximately 53%, varying the monomer feed ratio and conversion, which implied an alternating nature in the copolymer backbone. The copolymer obtained with a relatively high molecular weight (M-n = 1.05 to 2.27 x 10(5) g mol(-1)) shows good thermal stability and a moderate glass transition temperature (T-g = 75-79.5 degrees C). The copolymer also exhibits admirable transparency in the visible wavelengths (maximal transmittance approximate to 98%).

• 出版日期2016
• 单位浙江大学