Polybutylene succinate

Short description: Biodegradable polymer

Polybutylene succinate

Names
Other names

Poly(tetramethylene succinate)

Identifiers

CAS Number

* 25777-14-4

Abbreviations  | PBS
Properties

Chemical formula

| (C8H12O4)n
Density | 1.26 g/cm3
Melting point |  115 °C (239 °F; 388 K)

Solubility in water

| Insoluble
Solubility in chloroform | Soluble
Related compounds

Related Monomers

| Succinic acid
Butanediol

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Polybutylene succinate (PBS) (sometimes written polytetramethylene succinate) is a thermoplastic polymer resin of the polyester family. PBS is a biodegradable aliphatic polyester with properties that are comparable to polypropylene.

It may also be referred to by the brand names GsPLA or BioPBS (Mitsubishi Chemical).[1] PBS consists of polymerized units of butylene succinate, with repeating C

12O
4 units.

## Contents

* 1 History
* 2 Synthesis
* 3 Biodegradability
* 4 Applications
* 5 Industrial production
* 6 References

## History

A. V. Lourenço

W. H. Carothers

The synthesis of succinic acid based polyesters was first performed in 1863. In that time the Portuguese professor Agostinho Vicente Lourenço described in his "Recherche sur les composés polyatomiques" (Research on polyatomic compounds), the reaction between succinic acid and ethylene glycol to form what he named "succino-ethylenic acid". He noticed that this acid was losing water when it was heated at high temperatures (300 °C) and that a crystalline mass when obtained after cooling.[2] Unfortunately, Lourenço did not study much the structure of the material he obtained.

Later Davidoff (1886),[3] and then Voländer (1894) prepared this same material by using different methods. This early work was pursued in the 1930s by Wallace Carothers (E.I. du Pont de Nemours and Co.), with a more systematic study of succinic acid based polyesters. In that time the purpose of such study was to find a synthetic alternative to natural silk fiber.

Carothers, by eliminating water in a continuous distillation process, obtained polymers with molar masses significantly higher than what was previously synthesized.[4] Nevertheless, the properties of the final products did not show the expected qualities. Thus Carothers put more attention on polyamides and invented with his colleague Julian Hill Nylon 6,6.

Later Flory (1946) proposed an improved synthesis of aliphatic polyesters with diacid chloride.[5]

In the beginning of the 1990s, after being forgotten for more than 40 years, these polymers received a renewed interest due to the increasing demand on biodegradable and bio-based polymers.

## Synthesis

Like other polyesters such as polyethylene terephthalate, two main routes exist for the synthesis of PBS: the trans-esterification process (from succinate diesters) and the direct esterification process starting from the diacid. The direct esterification of succinic acid with 1,4-butanediol is the most common way to produce PBS. It consists of a two step process. First, an excess of the diol is esterified with the diacid to form PBS oligomers with elimination of water.

Then, these oligomers are trans-esterified under vacuum to form a high molar mass polymer. This step requires an appropriate catalyst such as titanium, zirconium, tin or germanium derivatives.[6]

## Biodegradability

Amycolatopsis sp. HT-6 and Penicillium sp. strain 14-3 can degrade PBS. Microbispora rosea, Excellospora japonica and E. viridilutea can consume samples of emulsified PBS.[7]

## Applications

As PBS decomposes into water and CO
2 through naturally occurring degrading enzymes and microorganisms,[8] it may be a biodegradable alternative to some common plastics. The scope of PBS application fields is still growing and several areas can be identified but it remains difficult to know precisely in which specific object PBS is actually used. First in the packaging field, PBS could be processed into films, bags, or boxes, for both food and cosmetic packagings. Other applications of PBS could be found as disposable products such as tableware or medical articles. In agriculture, PBS finds interest in the fabrication of mulching films or delayed release materials for pesticide and fertilizer. PBS is also promise to find market shares in fishery (for fishing nets), forestry, civil engineering or other fields in which recovery and recycling of materials after use is problematic.[9] In the medical field, PBS could be used as biodegradable drug encapsulation systems,[10] and is also investigated for implants.

## Industrial production

In industry, the improvement of the PBS synthesis allowed the large scale production of this polymer. The Japanese company Showa High Polymer, built in 1993 a semi-commercial plant able to produce 3,000 tons of polymer per year.[11] Sold under the tradename Bionolle, these polyesters are synthesized via melt condensation polymerization followed by a chain-extension with a diisocyanate.[12] Much later, in April 2003, Mitsubishi Chemicals built a 3,000 tons/year capacity and launched to the market a PBS named GS Pla (Green and Sustainable Plastic). This polymer has high molar masses without the use of a chain extender. Since then, several PBS producers such as Hexing Chemical (Anhui, China), Xinfu Pharmaceutical (Hangzhou, China) or IRe Chemical (South Korea) appeared on the market. In 2010 Hexing Chemical became China's first large-scale PBS enterprise, with the annual capacity of 10,000 tons. The same year Xinfu Pharmaceutical announced the building up of the world's largest continuous PBS production line with an annual capacity of 20,000 tons. At the moment most of these polyalkylene succinates are synthesized from petrochemical precursors. Nevertheless most of the producers are evaluating or developing bio-based succinic acid for the synthesis of these polyesters. In 2016, Showa Denko announced termination of the production and sale of Bionolle, citing delay in permeation of environmental regulations on plastic shopping bags and a fall in market prices of biodegradable plastics.[13]

## References

1. ↑ "Biodegradable Polymer "BioPBS" | Products". https://www.m-chemical.co.jp/en/products/departments/mcc/sustainable/product/1201025_7964.html.
2. ↑ Lourenço, A.V. (1863). "Recherches sur les composés polyatomiques". Ann. Chim. Phys. 67 (3).
3. ↑ Davidoff,O. (1886). "Ein Fall der Bildung von Bernsteinsäureäthylester". Ber. Dtsch. Chem. Ges. 19: 2. doi:10.1002/cber.18860190196.
4. ↑ Carothers, W.H. (1929). "Studies on polymerization and ring formation II. Poly-esters". J. Am. Chem. Soc. 51 (8): 10. doi:10.1021/ja01383a042.
5. ↑ U.S. Patent 2,589,687
6. ↑ Jacquel, N. (2011). "Synthesis and properties of poly (butylene succinate): Efficiency of different transesterification catalysts". J. Polym. Sci., Part A: Polym. Chem. 49 (24): 5301–5312. doi:10.1002/pola.25009. Bibcode: 2011JPoSA..49.5301J.
7. ↑ Yutaka Tokiwa; Buenaventurada P. Calabia; Charles U. Ugwu; Seiichi Aiba (September 2009). "Biodegradability of Plastics". International Journal of Molecular Sciences 10 (9): 3722–3742. doi:10.3390/ijms10093722. PMID 19865515.
8. ↑ Xu, J. (2010). "Microbial Succinic Acid, Its Polymer Poly(butylene succinate), and Applications". Plastics from Bacteria. Microbiology Monographs. 14. pp. 347–388. doi:10.1007/978-3-642-03287-5_14. ISBN 978-3-642-03286-8.
9. ↑ Xu, J. (2010). "Microbial Succinic Acid, Its Polymer Poly(butylene succinate), and Applications". Plastics from Bacteria. Microbiology Monographs. 14. pp. 347–388. doi:10.1007/978-3-642-03287-5_14. ISBN 978-3-642-03286-8.
10. ↑ Brunner, C.T. (2011). "Performance of biodegradable microcapsules of poly(butylene succinate), poly(butylene succinate-co-adipate)and poly(butylene terephthalate-co-adipate) as drug encapsulation systems". Colloids and Surfaces B:Biointerfaces 84 (2): 498–507. doi:10.1016/j.colsurfb.2011.02.005. PMID 21376545.
11. ↑ Xu, J. (2010). "Microbial Succinic Acid, Its Polymer Poly(butylene succinate), and Applications". Plastics from Bacteria. Microbiology Monographs. 14. pp. 347–388. doi:10.1007/978-3-642-03287-5_14. ISBN 978-3-642-03286-8.
12. ↑ Fujimaki, T. (1998). "Processability and properties of aliphatic polyesters, 'BIONOLLE', synthesized by polycondensation reaction". Polymer Degradation and Stability 29 (1–3): 209–214. doi:10.1016/s0141-3910(97)00220-6.
13. ↑ "SDK to Terminate Production and Sale of Biodegradable Plastic | News Releases | SHOWA DENKO K.K." (in en). http://www.sdk.co.jp/english/news/15030/16250.html.

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