Green polycarbonates prepared by the copolymerization of CO 2 with epoxides

Lee

J of Applied Polymer Sci

et al. 2016

The condensation of a mixture of dimethyl carbonate and phthalate derivatives with 1,4‐butanediol (BD), catalyzed by sodium alkoxide, generated high‐molecular weight poly(1,4‐butylene carbonate‐co‐aromatic ester)s with molecular weights (Mn) of 50–120 kDa. The subsequent addition of polyols [BD, glycerol propoxylate, 1,1,1‐tris(hydroxymethyl)ethane, or pentaerythritol] chopped these high‐molecular weight polymers to afford macrodiols or macropolyols with facile control of their molecular weights (Mn, 2000–3000 Da) and unique chain topological compositions. Macropolyols prepared by chopping poly(1,4‐butylene carbonate‐co‐terephthalate) were waxy in nature, whereas those containing isophthalate and phthalate units were oily. The macropolyols synthesized by this chopping method may have potential applications in the polyurethane industry. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43754.

Section: Introductionmentioning

confidence: 99%

Chopping high‐molecular weight poly(1,4‐butylene carbonate‐co‐aromatic ester)s for macropolyol synthesis

Lee

J of Applied Polymer Sci

et al. 2016

Macromolecular Symposia

“…The synthesis of polymeric materials starting from renewable feedstock like CO 2 is an important research area because of its economical implications. Polycarbonates are materials that can be synthesized by alternating copolymerization of carbon dioxide with an epoxide, a reaction that needs a selective and efficient catalyst . In this direction, in this work we first investigated the catalytic action of AuNp's supported on silica particles in the oxidation reaction of styrene to epoxide as first step for the synthesis of polycarbonates, which will be considered in a future work.…”

Section: Resultsmentioning

confidence: 99%

Au Nanoparticles Supported on Aminopropyl Functionalized Silica Particles as Catalyst for the Selective Oxidation of Styrene

Martínez‐Lejia

Torres-Lubián

Moggio

et al. 2017

Au nanoparticles were synthesized by reduction of the hydrogen tetrachloroaurate (III) hydrate with boron hydride in the presence of commercial aminopropyl silica particles. Two different Au loadings (3.6 and 6.9 wt%) were obtained by varying the initial amount of the gold salt. By EFM, the gold nanoparticles can be visualized as conductive regions on the surface of the silica support. According to UV‐Vis‐NIR spectroscopy and TEM, silica‐AuNPS with 3.6 wt% presents a tinier mean size and narrower size distribution. Therefore they were chosen for catalytic activity studies in the oxidation of styrene to form the corresponding epoxide by using peroxide as oxidant. It was found that both the yield and selectivity of the products formed during the oxidation were very sensitive to the experimental conditions; for instance, if the reaction was carried out in vacuum, the styrene consumption was of 50%. In contrast, if the reaction was achieved in air, the consumption was of ca. 90%, while the selectivity to generate the epoxide group was of 62%.

Macromol. Rapid Commun.

“…Besides ring‐opening polymerization of cyclic carbonate monomers, CO 2 ‐epoxy addition polymerization also plays an important role in the synthesis of functional aliphatic polycarbonates . For example, the copolymerization of limonene oxide and CO 2 gave a polycarbonate platform in which the double bond was used for thiol‐ene reaction to produce rubber, antibacterial polymer, heat processing grade material, and sea water soluble polymer, as shown in Figure .…”

Section: Click Chemistry In the Synthesis Of Functional Aliphatic Polmentioning

confidence: 99%

Click Chemistry in Functional Aliphatic Polycarbonates

Dai

Zhang

Xia

2017

Click chemistry, one of the most important methods in conjugation, plays an extremely significant role in the synthesis of functional aliphatic polycarbonates, which are a group of biodegradable polymers containing carbonate bonds in their main chains. To date, more than 75 articles have been reported on the topic of click chemistry in functional aliphatic polycarbonates. However, these efforts have not yet been highlighted. Six categories of click reactions (alkyne-azide reaction, thiol-ene reaction, Michael addition, epoxy-amine/thiol reaction, Diels-Alder reaction, and imine formation) that have been afforded for further post-polymerization modification of polycarbonates are reviewed. Through this review, a comprehensive understanding of functional aliphatic polycarbonates aims to afford insight on the design of polycarbonates for further post-polymerization modification via click chemistry and the expectation of the practical application.