CAS Key Laboratory of Soft Matter Chemistry, Department of Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, PR China.
J Phys Chem B. 2011 May 26;115(20):6474-83. doi: 10.1021/jp1122807. Epub 2011 May 2.
Bionic multisilicon copolymers have long-main chains and many branched chains, and contain multifunctional groups of -N(+)(CH(3))(3)Cl(-) and -Si(OCH(3))(3), which are similar to the stem, branch, fruit, and acetabula of a vine from bionic aspect, respectively. They have high flexibility, charge density, and cross-linking ability and thus can be used as novel cross-linking agents for preparing anion-exchange hybrid membranes. High content of -Si(OCH(3))(3) groups (68-78%) is suitable to enhance membrane stabilities. The membranes are stable in 65 °C water up to 120 h and can keep integrity in 2 mol/L NaOH for 192 h. High content of -N(+)(CH(3))(3)Cl(-) groups (42-55%) is suitable to enhance membrane electrical properties. The membranes have low membrane resistance (R(m), 0.59-0.94 Ω cm(2)) and high diffusion dialysis performance. The acid (H(+)) dialysis coefficients (U(H)) are in the range of 0.007-0.075 m h(-1) at room temperature and 0.015-0.115 m h(-1) at 40 °C. The separation factor (S(H/Fe)) can reach up to 43 at room temerature and 49 at 40 °C. All of the membranes are highly homogeneous, mechanically stable (21-31 MPa, 25-147%), and thermally stable (227-275 °C for halide form membranes, and 157-172 °C for OH(-) form membranes). Hence, the investigation of multisilicon copolymers will give rise to a new developing field in material and membrane sciences.
仿生多硅共聚高分子具有长的主链和许多支链，并且包含多功能基团-N(+)(CH(3))(3)Cl(-)和-Si(OCH(3))(3)，分别类似于仿生学意义上的葡萄藤的茎、枝、果和窝。它们具有高柔韧性、电荷密度和交联能力，因此可用作新型交联剂来制备阴离子交换混合膜。高含量-Si(OCH(3))(3)基团（68-78%）适合增强膜稳定性。该膜在 65°C 水中稳定长达 120 小时，在 2 mol/L NaOH 中可保持完整性 192 小时。高含量-N(+)(CH(3))(3)Cl(-)基团（42-55%）适合增强膜的电学性能。该膜具有低膜电阻（R(m)，0.59-0.94 Ω cm(2))和高扩散透析性能。在室温下，酸（H(+））透析系数（U(H)）在 0.007-0.075 m h(-1)范围内，在 40°C 下为 0.015-0.115 m h(-1)。分离因子（S(H/Fe)）在室温下可达 43，在 40°C 下可达 49。所有膜均高度均匀、机械稳定（21-31 MPa，25-147%），热稳定（卤化物形式的膜为 227-275°C，OH(-)形式的膜为 157-172°C）。因此，多硅共聚高分子的研究将为材料和膜科学开辟一个新的发展领域。
