Copolymerization by Complex Catalyst

Copolymerization Using Lipase Catalyst

Enzymatic ring-opening copolymerization of lactones was carried out by using Pseudomonas f luorescens lipase in bulk. In the copolymerizaton of r-caprolactone (E-CL) and b-valerolactone at 60°C for 10 days a copolymer with molecular weight of 3.7 x 103 was obtained and its structure was found to be of random structure having both units from 13C NMR anlaysis. Effects of the feed ratio, the react...

Living polymerization and block copolymerization of alpha-olefins by an amine bis(phenolate) titanium catalyst.

An amine bis(phenolate) dibenzyl titanium complex having a methoxy donor on a side arm leads, upon activation with tris(pentafluorophenyl)borane, to unique living properties in alpha-olefin polymerization: exceptionally high molecular weight poly(1-hexene) is obtained in a living fashion at room temperature, living polymerization of 1-hexene is obtained above room temperature, and block copolym...

Statistical Ring Opening Metathesis Copolymerization of Norbornene and Cyclopentene by Grubbs' 1st-Generation Catalyst.

Statistical copolymers of norbornene (NBE) with cyclopentene (CP) were prepared by ring-opening metathesis polymerization, employing the 1st-generation Grubbs' catalyst, in the presence or absence of triphenylphosphine, PPh₃. The reactivity ratios were estimated using the Finemann-Ross, inverted Finemann-Ross, and Kelen-Tüdos graphical methods, along with the computer program COPOINT, which eva...

Complex Analysis as Catalyst

We see the subject of complex analysis, in both one and several variables, as an excuse to study other areas: real variables, topology, group theory, abstract algebra, partial differential equations, or geometry. The purpose of this paper is to develop that theme, illustrated by several examples. 0 Prefatory Thoughts I am known as a complex analyst, yet I have never had a course in complex vari...

Mechanism-based design of a ROMP catalyst for sequence-selective copolymerization.