Topic
Copolyester
About: Copolyester is a research topic. Over the lifetime, 4225 publications have been published within this topic receiving 43206 citations.
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TL;DR: It is suggested that butyric and pentanoic acids are incorporated into the copolyester as 3HB and 3HV units respectively without decomposition of the carbon skeletons in the cell.
Abstract: Copolyesters of 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV) have been produced by Alcaligenes eutrophus in nitrogenfree culture solutions of butyric and pentanoic acids. When pentanoic acid was used as the sole carbon source, a copolyester with an unusually high 3HV fraction of 90 mol% was produced. Copolyesters with a wide range of compositions (0–90 mol% 3HV) were obtained by using butyric and pentanoic acids together as carbon sources. The biosynthetic pathways of poly(3-hydroxybutyrate) were investigated using [1-13C]acetate and [1-13C]butyrate. It is suggested that butyric and pentanoic acids are incorporated into the copolyester as 3HB and 3HV units respectively without decomposition of the carbon skeletons in the cell.
320 citations
TL;DR: The poly(3HB) homopolymer and poly (3HB-co-3HA) copolymer were produced simultaneously within cells from glucose in the absence of any nitrogen source, which suggests that Pseudomonas sp.
Abstract: Pseudomonas sp. 61-3 (isolated from soil) produced a polyester consisting of 3-hydroxybutyric acid (3HB) and of medium-chain-length 3-hydroxyalkanoic acids (3HA) of C6, C8, C10 and C12, when sugars of glucose, fructose and mannose were fed as the sole carbon source. The polyester produced was a blend of homopolymer and copolymer, which could be fractionated with boiling acetone. The acetone-insoluble fraction of the polyester was a homopolymer of 3-hydroxybutyrate units [poly (3HB)], while the acetone-soluble fraction was a copolymer [poly(3HB-co-3HA)] containing both short- and medium-chain-length 3-hydroxyalkanoate units ranging from C4 to C12:44 mol% 3-hydroxybutyrate, 5 mol% 3-hydroxyhexanoate, 21 mol% 3-hydroxyoctanoate, 25 mol% 3-hydroxydecanoate, 2 mol% 3-hydroxydodecanoate and 3 mol% 3-hydroxy-5-cis-dodecenoate. The copolyester was shown to be a random copolymer of 3-hydroxybutyrate and medium-chain-length 3-hydroxyalkanoate units by analysis of the 13C-NMR spectrum. The poly(3HB) homopolymer and poly (3HB-co-3HA) copolymer were produced simultaneously within cells from glucose in the absence of any nitrogen source, which suggests that Pseudomonas sp. 61-3 has two types of polyhydroxy-alkanoate syntheses with different substrate specificities.
301 citations
TL;DR: A series of high molecular weight polyesters, poly(butylene succinate- co -butylene adipate)s was prepared from dimethyl succinate, dimethyl adipate and 1,4-butanediol by catalyzed transesterification in the melt as mentioned in this paper.
294 citations
TL;DR: In this article, a series of aliphatic homopolyesters and copolyesters was prepared from 1,4 butanediol and dimethylesters of succinic and adipic acids through a two-step process of transesterification and polycondensation, which was characterized by means of nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), viscosity measurements, differential scanning calorimetry (DSC), X-ray diffraction (XRD), and mechanical property measurements.
286 citations
Patent•
22 Jun 1970TL;DR: In this article, the authors discuss the effect of the length of a long chain on the performance of a short chain elastomer and show that at least 80% of the short chains are 1,4-butanedIOLs.
Abstract: SEGMENTED THERMOPLASTIC COPOLYESTER ELASTOMERS CONTAINING RECURRING POLYMERIC LONG CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LONG CHAIN GLYCOLS AND SHORE CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LOW MOLECULAR WEIGHT DIOLS. AT LEAST 80% OF THE DICARBOXYLIC ACID USED IS TEREPHTHALIC ACID AND AT LEAST 80% OF THE LOW MOLECULAR WEIGHT DIOL IS 1,4-BUTANEDIOL. THE SHORT CHAIN ESTER UNITS CONSTITUTE ABOUT 48-65% BY WEIGHT OF THE POLYMER. SUCH COPOLYESTERS RAPIDLY HARDEN FROM THE MOLTEN STATE AND HAVE OUTSTANDING PHYSICAL PORPERTIES, ESPECIALLY TEAR STRENGTH, EABRASION RESISTANCE AND FLEX LIFE.
283 citations