Microfiltration membrane of polymer blend of poly(L-lactic acid) and poly(ε-caprolactone)
Microfiltration membrane of polymer blend of poly(L-lactic acid) and poly(ε-caprolactone)
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DOI：
10.1016/j.desal.2005.06.068
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发表时间：
2006-05-10
期刊：
影响因子：
9.9
通讯作者：
Lloyd, DR
中科院分区：
文献类型：
--
作者：
Tanaka, T;Tsuchiya, T;Lloyd, DR
生物可降解过滤膜可应用于食品和生化过程中，以澄清产品或从悬浮液中获取颗粒，然后在堆肥过程中降解。在本研究中，我们由聚（ε - 己内酯）（PCL）和聚（L - 乳酸）（PLLA）的聚合物共混物开发了微滤膜。这些膜是通过热致相分离过程形成的，并用于从其悬浮液中分离酵母细胞。4∶1的共混比例（PCL∶PLLA）对于制备具有保留酵母细胞能力且膜不脱落的生物可降解聚合物共混膜是很重要的。PCL - PLLA共混（4∶1）膜的渗透阻力与PCL膜一样高，且比PLLA膜低三个数量级。在酵母细胞悬浮液的过滤过程中，PCL - PLLA（4∶1）膜的渗透阻力在过滤过程中的增加量比PLLA膜低得多。PCL - PLLA（4∶1）膜作为深层过滤器捕获细胞，而PLLA膜作为筛网过滤器。
Biodegradable filtration membranes can be applied in food and biochemical processes to clarify products or to yield particles from suspensions, and then degrade in composting processes. In this study we developed microfiltration membranes from a polymer blend of poly(F-caprolactone) (PCL) and poly(L-lactic acid) (PLLA). The membranes were formed via the thermally induced phase separation process and were used to separate yeast cells from their suspension. The blend ratio (PCL:PLLA) of 4:1 was important to prepare the biodegradable polymer-blend membrane with the ability of the retention of yeast cells and without exfoliation of the membrane. The permeation resistance of PCL-PLLA blend (4: 1) membranes was as high as that of PCL membranes and was three-order lower than that of a PLLA membrane. In the filtration of yeast cell suspensions the increase of the permeation resistance during the filtration was much lower with a PCL-PLLA (4: 1) membrane than with a PLLA membrane. The PCL-PLLA (4: 1) membrane captured the cells as a depth filter while the PLLA membrane did as a screen filter.