Polybutylene adipate

Polyethylene terephthalate [25038-59-9] (8) is a polyester produced by the condensation polymerization of dimethyl terephthalate and ethylene glycol. Polyethylene terephthalate sutures are available white (undyed), or dyed green with D C Green No. 6, or blue with D C Blue No. 6. These may be coated with polybutylene adipate (polybutilate), polyydimethylsiloxane, or polytetrafiuoroethylene [9002-84-0]. The sutures are distributed under the trade names Ethibond Exel, Mersdene, Polydek, Silky II Polydek, Surgidac, Tevdek II, Polyester, and Tl.Cron. 

Polybutylene adipate/terephthalate (PBAT) from BASF and IRe Chemical... 

Aliphatic polyesters like polycaprolactone (PCL) or polybutylene adipate (PBA) are readily biodegradable, but because of their melting points of 60 °C are unsuitable for many applications. On the other hand, aromatic polyesters like polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) have high melting points above 200 °C and very good material properties, but are not biodegradable. 

In previous publications, we have tested the association of TPS with different biodegradable polyesters polycaprolactone (PCL),2 polyesteramide (PEA),6 polybutylene succinate-adipate (PBSA),7 polybutylene adipate coterephtalate... 

Using special reactions, it has also been shown that, a degradable polymer can be produced as well i.e., by transesterification, new biodegradable polyesters can be synthesised from polybutylene adipate-co-succinate and polyethylene terephthalate [21]). 

Zhao, J.B., Li, K.Y. and Yang, W.T. (2007) Chain extension of polybutylene adipate and polybutylene succinate with adipoyl- and terephthaloyl-biscaprolactamate. Journal of Applied Polymer Science, 106 (1), 590-598. 

Copolymers of the polybutylene adipate-co-terephthalate type with a molar fraction of terephthalate of 42 mol-%, biodegrade completely to form compost in twelve weeks, whereas products with 51 mol-% of molar fraction of terephthalate show a percentage of biodegradation of less than 40% (42). This different behavior was attributed to the formation of a higher number of butylene terephthalate sequences with a length greater than or equal to 3, which are less easily biodegradable. 

The matrix is a biodegradable and aromatic copolyester (polybutylene adipate-co-terephthalate, PBAT), from Eastman (EASTAR BIO Ultra Copolyester 14766). Copolyester chemical structure is given in Table 17.2. This copolyester is soluble at room temperature in different solvents such as THF, CH2CI2, or CHCI3. Determined by HNMR, PBAT composition is 43% of butylene terephthalate and 57% of butylene adipate. Determined by size exclusion chromatography (SEC), molecular weight (Mw) and polydispersity index (IP) are 48,000 and 2.4, respectively. Melt flow index (MFI) is 13 g/10 min at 190°C/2.16 Kg. PBAT density is 1.27 g/cm at 23°C. 

Lindstrom and co-workers [137] carried out a quantitative determination of low molecular weight compounds migrating from polybutylene adipate and polyethylene succinate during ageing by hydrolytic degradation in water and phosphate buffer. This was achieved by solid-phase extraction in combination with GC/mass spectrometry. Monomers detected include adipic acid, 1,4-butanediol, for the polyethylene adipate and succinic acid and 1,4-butanediol from polybutylene succinate. 

Property Polycaprolactone (PCL) Polyesteramide (PEA) Polybutylene succinate/adipate (PBSA) Polybutylene adipate-co- terphthalate (PBAT)... 

Biodegradable composites of PBAT (polybutylene adipate-co-terephthalate) with bamboo flour, cryofracture surfaces [4] ... 

Polybutylene succinate Polybutylene succinate adipate Polybutylene succinate Polybutylene terephthalate Polybutylene adipate-co-terephtalate... 

Polybutylene Adipate Glycol n (PBAG) A polymeric diol used in the production of urethane elastomers. 

SMPU is usually synthesized from long-chain polyols, diisocyanate and short-chain extenders. The polyols that have typically been used to date include polycaprolactone (PCL), polytetramethylene ether glycol (PTMG), polybutylene adipate (PBA), polyhexamethylene adipate (PHA) and polylactic acid (PLA)... 

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