De-Fa Hou,Meng-Lei Li,Cong Yan,Ling Zhou,Zheng-Ying Liu,Wei Yang,Ming-Bo Yang
Cellulose is the most abundant natural macromolecular material, which offers a potential alternative feedstock to petroleum-based polymers. However, the large-scale and sustainable transformation of this biomass into available bio-plastics is still a challenge due to its inherent recalcitrance. Here, a sustainable esterification strategy of cellulose was developed to efficiently synthesize cellulose oleate (COE) by ball milling to endow cellulose with thermoplasticity. In this strategy, a low dosage of oleic acid (6 mol per anhydroglucose) and no solvent were used to achieve the goal during the ball-milling process. According to differential scanning calorimetry (DSC) analysis, the synthesized COEs possessed two major glass transitions at 25.6 °C–57.3 °C and 153.8 °C–172.5 °C corresponding to the motion of oleic side chains and cellulose backbones, respectively. Besides, the prepared COEs with a high degree of substitution (DS, 2.34–2.55) can be readily processed into homogeneous films with flexibility, transparency, and hydrophobicity by hot-pressing at 160 °C. This strategy is advantageous over traditional methods in the aspects of reduced reactant dosage, improved sustainability, and enhanced efficiency, which represents a potential green route to fabricate melt-processable cellulose esters in industry.
A biobased epoxy 2,5-bis[(2-oxiranylmethoxy)methyl]-furan (BOF) together with its petroleum-based analogues, 1,4-bis[(2-oxiranylmethoxy)methyl]-benzene (p-BOB) and 1,3-bis[(2-oxiranylmethoxy)methyl]-benzene (m-BOB), have been synthesized. After their chemical structures were identified by nuclear magnetic resonance (1H NMR and 13C NMR), they were cured by the petroleum-based 4,4′-diaminodiphenylmethane and biobased 5,5′-methylenedifurfurylamine, respectively. Thermal and mechanical properties of the cured resins were investigated by differential scanning calorimetry, thermogravimetric analyzer and dynamic mechanical analysis. Especially, hydrogen bonding interactions in the different cured systems were studied by Fourier transform infrared spectroscopy. Based on the structure–properties relationship investigation, it could be concluded that it was the hydrogen bonding interaction playing a key role in determining the thermal properties of the furan-based epoxy resins.
危险品化学品经营许可证（带存储）