Selective flux of organic liquids and solids using nanoporous membranes of polydicyclopentadiene
Selective flux of organic liquids and solids using nanoporous membranes of polydicyclopentadiene
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DOI：
10.1039/c1jm10970g
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Bowden, Ned B.
中科院分区：
文献类型：
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作者：
Long, Tyler R.;Gupta, Abhinaba;Bowden, Ned B.
采用Grubbs第一代催化剂进行双环戊二烯的开环易位聚合，制备了双环戊二烯开环易位聚合膜，并研究了21种分子在膜中的渗透性能。分子量为101 ~ 583 g mol（-1）的极性和非极性分子都能透过这些膜，其通量值为10（-5）~ 10（-6）mol cm（-2）h（-1），但选定的分子不能透过它们，其通量慢10（4）~ 10（5）倍。渗透的分子和不渗透的分子之间的通量差异很大，但没有观察到通量与分子量或疏水性相关的趋势。相反，不渗透膜的分子具有大的横截面积，这导致在高度交联的聚二环戊二烯膜内的低扩散速率。使用红外光谱测量聚双环戊二烯膜内的交联度，并且约84%的双环戊二烯单体已反应形成交联。这些是第一种有机溶剂纳滤膜，其分离基于横截面积的分子量为100至600 g mol（-1）的分子。
Membranes were fabricated from the ring opening metathesis polymerization of dicyclopentadiene with the Grubbs first generation catalyst, and the permeability of twenty-one molecules through them was studied. Both polar and apolar molecules with molecular weights from 101 to 583 g mol(-1) permeated these membranes with values for flux of 10(-5) to 10(-6) mol cm(-2) h(-1) but selected molecules did not permeate them and had flux 10(4) to 10(5) times slower. The difference in flux was large between molecules that permeated and those that did not permeate, but no trend was observed that correlated flux with molecular weight or hydrophobicity. Rather, molecules that did not permeate the membranes had large cross-sectional areas that led to low rates of diffusion within the highly cross-linked polydicyclopentadiene membranes. The degree of cross-linking within the polydicyclopentadiene membranes was measured using infrared spectroscopy and approximately 84% of the dicyclopentadiene monomer had reacted to form cross-links. These are the first organic solvent nanofiltration membranes that separate molecules with molecular weights from 100 to 600 g mol(-1) based on cross-sectional areas.