Ye Jun, Fu Zichang, Rao Jiawei, Xiong Jian
School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China.
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Polymers (Basel). 2022 Apr 20;14(9):1655. doi: 10.3390/polym14091655.
The influences of interactions between carboxymethyl cellulose (CMC) and CMC/europium (III)-terbium (III) (CET) on the structure and properties of the resultant CMC/CET films were investigated by rheology at three stages of the film-drying process. According to the water content at different drying times, the kinetics curves during the film-drying process were drawn. Then, the rheology properties of film-forming solutions during the drying process were characterized by dynamic modulus, Han plots, zero shear complex viscosity and relaxation time. When the water content was 90%, the film contained either 0.1 or 0.2 g of CET, which had good fluidity, while the film with 0.3 g of CET was elastic-dominated. Han plots and XRD analyses showed that the interactions between the CMC and CET were not hydrogen bonds but random entanglements. The zero-shear complex viscosity and relaxation time spectrum confirmed that the entanglements enhanced as the CET content increased. Meanwhile, aggregation formed in the solution of CMC with 0.3 g of CET. When CMC-CET films with different CET additions were compared, the film with 0.2 g of CET had an even and tight sheet structure, the greatest fluorescence intensity, and superior tensile strength of 78.76 MPa.
通过流变学研究了羧甲基纤维素（CMC）与CMC/铕（III）-铽（III）（CET）之间的相互作用在薄膜干燥过程三个阶段对所得CMC/CET薄膜结构和性能的影响。根据不同干燥时间的含水量，绘制了薄膜干燥过程中的动力学曲线。然后，通过动态模量、Han图、零剪切复数粘度和弛豫时间对干燥过程中成膜溶液的流变学性质进行了表征。当含水量为90%时，含有0.1或0.2 g CET的薄膜具有良好的流动性，而含有0.3 g CET的薄膜以弹性为主。Han图和XRD分析表明，CMC与CET之间的相互作用不是氢键，而是无规缠结。零剪切复数粘度和弛豫时间谱证实，随着CET含量的增加，缠结增强。同时，在含有0.3 g CET的CMC溶液中形成了聚集体。比较不同CET添加量的CMC-CET薄膜时，含有0.2 g CET的薄膜具有均匀致密的片状结构、最大的荧光强度和78.76 MPa的优异拉伸强度。
