The new green biobased pentamethylene diisocyanate (PDI) trimer curing agent has lower-life-cycle carbon emissions than the petrochemical-based hexamethylene diisocyanate (HDI) trimer curing agent, and its performance is similar to that of petrochemical-based products. This work focused on the synthesis, allophanate modification, free PDI monomer removal, and coating performances of PDI isocyanurate trimers. The results showed that optimal synthesis of PDI isocyanurate trimers used 2-hydroxypropyltrimethylisooctanoate ammonium salt (TMR) as a catalyst with 0.4 wt ‰ added and a reaction time of 120 min. The best free PDI monomer removal by molecular distillation used a removal temperature of 130 °C, a scraper speed of 350 rpm, and a feed rate of 3 mL·min–1, with two total removals. Self-made and allophanate-modified PDI isocyanurate trimers showed high values in physical and chemical properties. The water resistance, acid and alkali resistance, and aging resistance of the self-made and allophanate-modified PDI isocyanurate trimers were similar to or even better than those of petrochemical-based HDI products. These results indicate the application potential of biobased PDI-trimer curing agents.

MQ silicone resins represent a broad range of hydrolytic condensation products of monofunctional silane (M units) and tetrafunctional silane (Q units). In this work, a Bio-Phenol MQ silicone resin (BPMQ) was designed and synthesized by the hydrosilylation of hydrogen containing MQ silicone resin and eugenol in the presence of chloroplatinic acid. The structure, thermal property, and antibacterial property against Escherichia coli of the modified MQ silicone resin were investigated. The results showed that BPMQ has been prepared successfully, and the thermal stability of this modified polymer improved significantly because of the introduction of phenyl in eugenol. The temperature at the maximum degradation rate increased from 250 °C to 422.5 °C, and the residual yields mass left at 600 °C were increased from 2.0% to 28.3%. In addition, its antibacterial property against Escherichia coli was also enhanced markedly without adding any other antimicrobial agents. This improved performance is ascribed to special functional groups in the structure of eugenol. The BPMQ polymer is expected to be applied to pressure-sensitive adhesives and silicone rubber products for the biomedical field due to its reinforcing effect and antioxidant quality.

In this study, the synthesis of a novel cationic coumarin-containing polymer (C-CPA) was presented. C-CPA was examined optically using photoluminescence (PL) spectroscopy. The optical data suggested that they were promising blue-emitting materials mainly due to the coumarin chromophore on the side chain. Moreover, the synthesized cationic polymer was suitable for layer-by-layer electrostatic selfassembly thin film deposition from dilute polymer solution and multilayers were fully characterized by UV-vis spectroscopy, PL spectroscopy and atomic force microscope.

Cadaverine carbamate, capturing the self-released carbon dioxide from the decarboxylation of l-lysine, is the green and sustainable separation of bio-based cadaverine.