LAQV/REQUIMTE Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, CQFB/REQUIMTE, 2829-516 Caparica, Portugal.
Instituto Superior de Agronomia, Universidade de Lisboa, LEAF - Linking Landscape Environment Agriculture and Food, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Carbohydr Polym. 2017 Aug 1;169:58-64. doi: 10.1016/j.carbpol.2017.03.084. Epub 2017 Mar 29.
Novel and stable gels of cellulose were produced. These gels are prepared at room temperature by combination of cellulose and tetramethylguanidine (TMG) in different ratios (1:1, 1:2, 1:3 in equivalents of alcohol groups of cellulose per number of molecules of TMG). Detailed NMR, SEM, rheological and XRD studies of these gels were carried out. The concentration of cellulose in the gel, temperature, frequency of oscillation and shear rate were used as variables in order to understand the fundamentals and optimize operational conditions, considering their possible use as matrices for CO capture. Cellulose recovery from a specific gel was performed using ethanol as precipitating agent, leading to a lower crystallinity, which permits to consider this polymer in further studies associated to physical/chemical modification of cellulose.
制备了新型稳定的纤维素凝胶。这些凝胶是在室温下通过纤维素与四甲基胍（TMG）以不同比例（纤维素的醇基团与 TMG 的分子数之比为 1:1、1:2、1:3）组合而成。对这些凝胶进行了详细的 NMR、SEM、流变和 XRD 研究。以纤维素在凝胶中的浓度、温度、振荡频率和剪切率为变量，以了解其基本原理并优化操作条件，考虑将其用作 CO2 捕获的基质。使用乙醇作为沉淀剂从特定凝胶中回收纤维素，导致结晶度降低，这使得可以在与纤维素的物理/化学改性相关的进一步研究中考虑使用这种聚合物。
