Ring-Expansion Polymerization of Lactide and δ-Valerolactone To Give Cyclic Biodegradable Copolymer
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초록
내용
The copolymerization of lactide (LA) and δ-Valerolactone (VL) has become a topic of interest due to the less environmental impact in terms of fully biodegradable and more sustainable polymers. Therefore, this work aims to synthesize poly(LA-co-VL) copolymer via ring-expansion polymerization in bulk at 165 °C. The mole ratios of LA/VL, total monomer/catalyst, and polymerization time were varied. The total mole The reaction was performed in the presence of stannous octoate (Sn(Oct2)) as a catalyst and salicylic acid as co-catalyst (mol ratio 1:1) at a short time (0.5 - 2 h). The characterizations of the poly(LA-co-VL) copolymer were done by 1H-NMR, 13C-NMR, GPC, DSC, TGA, and SAXD. Viscosity measurements and MALDI-TOF MS analysis were carried out to confirm the cyclic architecture of the copolymers.