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Therefore, to terminate the polymerization, a quenching agent must be added, such as a strong acid to protonate the polymer, or a nucleophile to add an end cap the polymer. If the π-complex is too weakly bound, termination of polymer chains can occur before a quenching agent is added, causing lower molecular weight polymers to form.
Artificial polymer: Man-made polymer that is not a biopolymer. Note 1: Artificial polymer should also be used in the case of chemically modified biopolymers. Note 2: Biochemists are now capable of synthesizing copies of biopolymers that should be named Synthetic biopolymer to make a distinction with true biopolymers.
Polyethylene, the most-produced synthetic polymer, is produced industrially by the polymerization of ethylene: n C 2 H 4 → (C 2 H 4 ) n Although exergonic (i.e., thermodynamically favorable), the reaction requires catalysts.
The flagship company, Cook Incorporated, part of the medical division, was founded in 1963 in a spare bedroom in Bloomington. [1] The first products of Cook Incorporated included catheters, needles, and wire guides. [4] Today, the company manufactures more than 16,000 products across 10 hospital service lines, and serves 135 countries. [5]
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Nevertheless most of the producers are evaluating or developing bio-based succinic acid for the synthesis of these polyesters. In 2016, Showa Denko announced termination of the production and sale of Bionolle, citing delay in permeation of environmental regulations on plastic shopping bags and a fall in market prices of biodegradable plastics. [15]