1:00 PM - 1:15 PM

[1F08] Cycloolefin copolymers bearing pendant fluorenyl groups with improved refractive index and low birefringence values

○Haobo Yuan¹, Ryo Tanaka¹, Yuushou Nakayama¹, Takeshi Shiono¹ (1. Hiroshima University)

Copolymerizations of norbornene and alkenyl monomers bearing fluorenyl groups were conducted by using (^tBuNSiMe₂Flu)TiMe₂-[Ph₃C][B(C₆F₅)₄]/scavenger system. Copolymers with controllable fluorenyl group contents were obtained with high yields. The copolymers were made into transparent films by a solvent casting procedure, and the copolymers films were transparent with high refractive indexes and low birefringence values.

1:15 PM - 1:30 PM

[1F09] Polymerization of conjugated diene by catalytic systems combining rare-earth amides and pyridine derivatives.

○Kento Shibuta¹, Daisuke Takeuchi¹, Shigenaga Takano² (1. Hirosaki University, 2. Bridgestone Corp.)

Herein we report that catalytic systems combining rare-earth metal amide and nitrogen-containing ligand such as dihydroxybipyridine, triisobutylaluminum, and trityl bolate promote polymerization of isoprene to give polyisoprene with highly cis-1,4 microstructure. In particular, high cis-1,4-selective polymerization could be achieved when dihydroxybipyridine and neodymium amide were used. Polymerization using similar pyridine derivatives and various rare-earth metal amides was also investigated.

1:30 PM - 2:15 PM

[1F10] [Invited] Theoretical studies on XANES spectra and reaction mechanism of transition metal complex catalysts

○Naoki Nakatani¹ (1. Graduate School of Science, Tokyo Metropolitan University)

XANES is the fine structure observed in the pre-edge region of X-ray absorption spectra, which gives us a useful information about local geometry and electronic structure of a target atom in material. However, it is somewhat difficult to extract such information only from spectra because of the arbitrariness on its assignment. In this work, XANES spectra of transition metal complexes were simulated based on quantum chemistry calculations to reveal the reaction mechanism of polymerization catalysts in solution.

break (2:15 PM - 2:30 PM)

2:30 PM - 2:45 PM

[1F11] On the origin of active and selective nanostructures of Ziegler-Natta catalyst

○Toru Wada^1,2, Alessandro Piovano^2,3, Gentoku Takasao¹, Patchanee Chammingkwan^1,2, Elena Groppo^3,2, Minoru Terano^1,2, Toshiaki Taniike^1,2 (1. Japan Advanced Institute of Science and Technology, 2. DPI, 3. University of Torino)

Although nanometer-sized and defective δ-MgCl₂ supports are indispensable for Ziegler-Natta catalysts, their formation process has not been fully elucidated. In this study, we investigated the formation of nanostructures and active surfaces of Ziegler-Natta catalysts using a multifaceted approach including chemical composition analysis and polymerization tests in addition to total X-ray scattering and various spectroscopic methods. It led us to approach the significance of each step in the preparation method, which has been empirically improved over a long history.

2:45 PM - 3:00 PM

[1F12] Evaluation and upgrade on catalytic performance of solid MAO activated single-site catalysts

○Kazuki Ae¹, Ryo Tanaka¹, Yuushou Nakayama¹, Takeshi Shiono¹ (1. Hiroshima University Graduate School of Advanced Science and Engineering)

金属錯体を固体ポリメチルアルミノキサン(固体MAO)で活性化したシングルサイト触媒は、均質なオレフィン共重合体を気相プロセスで製造するために重要であるが、固体MAOの構造や性質は未だ必ずしも明らかではない。そこで固体MAO担持Ti及びNi錯体触媒によるオレフィン重合を行い、その触媒能を評価した。また滴定により、固体MAOの酸点の量並びに強度の評価も行い、これらの相関関係を明らかにした。

Session information

[1F08-12] Polymer, oligomer(3)