Rheological behaviors and miscibility of mixture solution of polyaniline and cellulose dissolved in an aqueous system.
Rheological behaviors and miscibility of mixture solution of polyaniline and cellulose dissolved in an aqueous system.
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DOI：
10.1021/bm3006243
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发表时间：
2012-07
影响因子：
6.2
通讯作者：
Xingwei Shi;A. Lu;J. Cai;Lina Zhang;Hongming Zhang;Ji Li;Xianhong Wang
中科院分区：
文献类型：
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作者：
Xingwei Shi;A. Lu;J. Cai;Lina Zhang;Hongming Zhang;Ji Li;Xianhong Wang
在我们之前的工作中，通过氢键重排，构建了由亲水性纤维素和疏水性聚苯胺（PANI）在低温下溶解于NaOH/尿素水溶液中的超分子膜。为了进一步了解复合溶液的混相性和可加工性，本文首次对聚苯胺/纤维素复合溶液的动态流变行为进行了研究。透射电镜（TEM）结果表明，该包合物由聚苯胺和纤维素组成，存在于水溶液中，表现出良好的混溶性。时间-温度叠加（ts）结果表明，PANI/纤维素溶液呈现均匀体系，复合溶液在5 ~ 25℃范围内比纤维素溶液更稳定。Winter-Chambon理论被证明能够描述聚苯胺/纤维素复合物溶液的凝胶行为。凝胶点弛豫指数为0.74，低于纤维素溶液，表明聚苯胺与纤维素链之间存在较强的相互作用。聚苯胺/纤维素溶液的流动活化能相对较大，说明在凝胶化过程中，“连接区”的键形成和断裂。此外，聚苯胺/纤维素凝胶可以在高温下形成，这是一个物理交联和链纠缠的过程，并且是一个热不可逆过程。此外，聚苯胺/纤维素溶液在0 - 8°C的温度范围内长时间保持液态，这对工业过程很重要。
In our previous work, supramolecular films composed of hydrophilic cellulose and hydrophobic polyaniline (PANI) dissolved in NaOH/urea aqueous solution at low temperature through rearrangement of hydrogen bonds have been constructed. To further understand the miscibility and processability of the complex solution, the dynamic rheological behaviors of the PANI/cellulose complex solution were investigated, for the first time, in the present work. Transmission electron microscope (TEM) results demonstrated that the inclusion complexes consisted of PANI and cellulose, existed in the aqueous solution, showing a good miscibility. Time-temperatures superposition (tTs) results indicated that the PANI/cellulose solution exhibited a homogeneous system, and the complex solution was more stable than the cellulose solution in the temperature range from 5 to 25 °C. Winter-Chambon theory was proved to be capable of describing the gelation behavior of the PANI/cellulose complex solution. The relaxation exponent at the gel point was calculated to be 0.74, lower than the cellulose solution, indicating strong interactions between PANI and cellulose chains. Relatively larger flow activation energy of the PANI/cellulose solution suggested the formation and rupture of linkages in "junction zones" during the gelation processes. Furthermore, PANI/cellulose gels could form at elevated temperature as a result of the physical cross-linking and chain entanglement, and it was a thermoirreversible process. Moreover, the PANI/cellulose solution remained a liquid state for a long time at the temperature range from 0 to 8 °C, which is important for the industry process.