A1 Journal article (refereed)
Rigid biobased polycarbonates with good processability based on a spirocyclic diol derived from citric acid (2020)


Bonjour, Olivier; Liblikas, Ilme; Pehk, Tõnis; Khai-Nghi, Truong; Rissanen, Kari; Vares, Lauri; Jannasch, Patric (2020). Rigid biobased polycarbonates with good processability based on a spirocyclic diol derived from citric acid. Green Chemistry, 22 (12), 3940-3951. DOI: 10.1039/d0gc00849d


JYU authors or editors


Publication details

All authors or editors: Bonjour, Olivier; Liblikas, Ilme; Pehk, Tõnis; Khai-Nghi, Truong; Rissanen, Kari; Vares, Lauri; Jannasch, Patric

Journal or series: Green Chemistry

ISSN: 1463-9262

eISSN: 1463-9270

Publication year: 2020

Volume: 22

Issue number: 12

Pages range: 3940-3951

Publisher: Royal Society of Chemistry

Publication country: United Kingdom

Publication language: English

DOI: http://doi.org/10.1039/d0gc00849d

Open Access: Open access publication published in a hybrid channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71209


Abstract

Introducing biobased polymers from renewable sources for use as high-performance thermoplastics with high demands on mechanical rigidity, transparency, thermal stability, as well as good processability, is a significant challenge. In the present work we have designed and prepared a rigid biobased bis-spirocylic diol by di-cycloketalization of a bicyclic diketone (cis-bicyclo[3.3.0]octane-3,7-dione, obtained from citric acid) using trimethylolpropane. This spiro-diol monomer has two reactive primary hydroxyl groups and the synthesis from inexpensive biobased starting materials is straightforward and readily upscalable, involving no chromatographic purification. In order to explore the usefulness of the new monomer, it was employed in melt polycondensations with diphenylcarbonate at up to 280 °C to form rigid fully amorphous polycarbonates (PCs). Molecular weights (MWs) up to Mn = 28 kg mol−1 were achieved, and thermal and dynamic mechanical measurements showed glass transitions up to Tg = 100 °C, with no thermal decomposition until Td ∼350 °C. Solvent cast films had excellent mechanical flexibility and strength, as well as a high transparency with only slight coloration. Results by dynamic melt rheology implied that the high-MW PCs had a good processability at 170 °C, with a stable shear modulus over time, but started to degrade via chain scission reactions when the temperature approached 200 °C. In conclusion, the present work demonstrates the straightforward preparation of the citric acid-based spiro-diol, and indicates that it is an efficient building block for the preparation of rigid biobased PCs and other condensation polymers.


Keywords: polymer chemistry; polymers; bioplastic; thermoplastic


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Ministry reporting: Yes


Last updated on 2020-21-07 at 11:03