Aliphatic polyesters derivatives

Yu X-h, Feng J, Zhuo RX (2005) Preparation of hyperbranched aliphatic polyester derived from functionalized l,4-dioxan-2-one. Macromolecules 38 6244—6247... 

Noncrystalline aromatic polycarbonates (qv) and polyesters (polyarylates) and alloys of polycarbonate with other thermoplastics are considered elsewhere, as are aliphatic polyesters derived from natural or biological sources such as poly(3-hydroxybutyrate), poly (glyc olide), or poly (lac tide) these, too, are separately covered (see Polymers, environmentally degradable Sutures). Thermoplastic elastomers derived from poly(ester—ether) block copolymers such as PBT/PTMEG-T [82662-36-0] and known by commercial names such as Hytrel and Riteflex are included here in the section on p oly (butylene terephthalate). Specific polymers are dealt with largely in order of volume, which puts PET first by virtue of its enormous market volume in bottle resin. 

Several review articles on biodegradable polymers and polyesters have appeared in the literature [12-22]. Extensive studies have been carried out by Al-bertsson and coworkers developing biodegradable polymers such as polyesters, polyanhydrides, polycarbonates, etc., and relating the structure and properties of aliphatic polyesters prepared by ROP and polycondensation techniques. In the present paper, the current status of aliphatic polyesters and copolyesters (block, random, and star-shaped), their synthesis and characterization, properties, degradation, and applications are described. Emphasis is placed primarily on aliphatic polyesters derived by condensation of diols with dicarboxylic acids (or their derivatives) or by the ROP of cyclic monoesters. Polyesters derived from cyclic diesters or microbial polyesters are beyond the scope of this review. 

Synthetic Strategies to Develop Aliphatic Polyesters Deriving from Renewable Resources... 

It is an aliphatic polyester derived from renewable resources, such as com starch, tapioca roots, chips or starch, or sugarcane. Polylactic acid or polylactide (PLA) can withstand temperatures up to 110 °C [69]. PLA is soluble in chlorinated solvents, hot benzene, tetrahydrofuran, and dioxane [70]. It can be processed like other thermoplastics into fiber (for example, using conventional melt spinning processes) and film. Due to the chiral nature of lactic acid, several distinct forms of polylactide exist ... 

Aliphatic polyesters derived from lactic and glycolic acids... 

Functional aliphatic polyesters derived from malic acids... 

Recently we succeeded in preparing rather large quantities of a primary amine-bearing aliphatic polyester derived from L- and DL-serine, namely poly(amino serinate) or PAS. This polyamine is a potential carrier for oligonucleotides and DNA fragments. It enabled us to make bioresorbable polyelectrolyte complexes where drugs could be easily entrapped for sometime . 

Li, S. (1999) Hydrolytic degradation characteristics of aliphatic polyesters derived from lactic and glycolic acids. Journal of Biomedical Materials Research, 48,342-353. 

PLA is an aliphatic polyester, derived from renewable resources, e. g. com starch or sugarcane sucrose. It is a pol)nner produced from lactic add (Figure 2), which is obtained from the fermentation of various carbohydrate spedes glucose, maltose and dextrose from corn or potato starch sucrose from beet or sugar cane and ladose from cheese whey [63]. 

Abstract PLA belongs to the family of aliphatic polyesters derived from a-hydroxy acids. The basic building block of PLA, lactic acid, (2-hydroxy propionic acid), can exist in optically active D- or L-enantiomers, which can be produced by carbohydrate fermentation or chemical syntihesis. Depending on the proportion of the enantiomers, PLA of with variable material properties can be derived. This allows the production of a wide spectrum of PLA polymers to match performance requirements. 

Aliphatic polyesters derived from the polycondensation of diols with aliphatic dicarboxylic acids are another important class of synthetic biodegradable polymers. Since 1994, Showa Highpolymer in Japan has been producing a family of aliphatic polyesters known as Bionolle , obtained from butanediol and succinic acid to give polybutylene succinate (PBS), and the copolymer polybutylene succinate adipate (PBSA) obtained from butanediol, succinic acid and adipic acid. Polyethylene succinate (PES) was also produced. 

Biodegradable Aliphatic Polyesters Derived FROM 1,3-Propanediol Current Status and... 

Biodegradable Aliphatic Polyesters Derived from 1,3-Propanediol ... 

NARAYAN, R., KRisHNAN, M., DUBOIS, p., Polysacchatides grafted with aliphatic polyesters derived from cychc esters, U.S. Patent, 1996,5,540,929. 

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