Enzymatic copolymerization

FIGURE 4.9 Products from the enzymatic copolymerization of guaiacol and 4-chloroaniline. 

Lipase CA catalyzed the polymerization of cyclic dicarbonates, cyclobis (hexamethylene carbonate) and cyclobis(diethylene glycol carbonate) to give the corresponding polycarbonates [105]. The enzymatic copolymerization of cyclobis(diethylene glycol carbonate) with DDL produced a random ester-carbonate copolymer. As to enzymatic synthesis of polycarbonates, reported were polycondensations of 1,3-propanediol divinyl dicarbonate with 1,3-propanediol [110], and of diphenyl carbonate with bisphenol-A [111]. 

Mita, N., Tawaki, S., Uyama H., and Kobayashi, S. 2001. Molecular weight control of polyphenols by enzymatic copolymerization of phenols. Polym. J., 33, 374-376. 

Enzymatic copolymerization of dopa and 5-5-cysteinyldopa led to products with both eu- and phaeomelanin properties. Thus, reaction of a... 

Fig. 6 Above Schematic view of steps involved in the self-assembly process in the comonomer mixture (DELT and L-tyrosine) and its enzymatic copolymerization. States 1 and 11 represents the species we visualized in this study, where = m (a 1 1 ratio of comonomers). State 11 is an hypothetical structure of the final copolymer formed. Below NC-AFM visualization (vertical and 3-D views) of samples following the 1 1 ratio comonomers (DELT and L-tyrosine) copolymerized over a 24h reaction and equilibrium period, followed by immersion of the gold coated mica a 20 xm x 20 xm area and b 5 p.m X 5 p.m area. This figure was reprinted with permission from [59]...

Enzymatic copolymerization is employed to synthesize copolymers of aniline and 3-aminobenzeneboronie aeid (with difierent mole ratios). The electrolyte is... 

Milstein O, Mai C, Huttermann, A (1996) Enzymatic copolymerization of lignin with low molecularweight compounds. In Proceedings of the sixth international conference on biotechnology in the pulp and paper industry, Vienna, pp 645-648... 

A configurationally pure poly(l,6-hexanediyl maleate) was enzymatically synthesized by the hpase CA-catalyzed polymerization of dimethyl maleate and 1,6-hexanediol in toluene. No melting point was observed in the linear polymer of the cis structure, whereas the cychc ohgomer (byproduct) was senucrystaUine [116]. hi the enzymatic copolymerization of dimethyl maleate, dimethyl fumarate, and 1,6-hexanediol in toluene, the content of the cyclization was found to mainly depend on the configuration and concentration of the monomers [117]. 

---