Bonjour, Olivier; Liblikas, Ilme; Pehk, Tonis; Khai-Nghi, Truong; Rissanen, Kari; Vares, Lauri; Jannasch, Patric published the artcile< Rigid biobased polycarbonates with good processability based on a spirocyclic diol derived from citric acid>, COA of Formula: C19H34O2, the main research area is spirocyclic diol biobased polycarbonate synthesis property processability.
Introducing biobased polymers from renewable sources for use as high-performance thermoplastics with high demands on mech. 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 chromatog. 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). Mol. weights (MWs) up to Mn = 28 kg mol-1 were achieved, and thermal and dynamic mech. measurements showed glass transitions up to Tg = 100°C, with no thermal decomposition until Td ∼350°C. Solvent cast films had excellent mech. flexibility and strength, as well as a high transparency with only slight coloration. Results by dynamic melt rheol. 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.
Green Chemistry published new progress about Condensation polymerization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics