TY - JOUR T1 - Temperature-sensitive Composite Membranes with "Double Switch" on Water Vapor Permeability AU - Lijing Wang JO - Journal of Fiber Bioengineering and Informatics VL - 3 SP - 233 EP - 238 PY - 2008 DA - 2008/01 SN - 1 DO - http://doi.org/10.3993/jfbi12200809 UR - https://global-sci.org/intro/article_detail/jfbi/5045.html KW - temperature-sensitive KW - composite membranes KW - double switch KW - water vapor permeability AB - Temperature-sensitive polymer membranes were prepared by combination of shape memory hydrophilic polyurethane (SMPU) and thermo-sensitive poly(N-isopropylacrylamide-co-sodium acrylate) [poly(NiPAAm-co-SA)] hydrogel micro-particles through composite coating method. These two intelligent polymer components endowed the composite membranes with “double switch” on the water vapor permeability. Poly(NiPAAm-co-SA) hydrogel micro-particles exhibited a reversible volume transition at lower critical solution temperature (LCST) around 34-36°C in the experiment. The size of gel particles varied more than 10-fold between temperature above and below LCST. It is likely acted as a sensor of temperature and as an switch to regulate the water vapor permeability of composite membranes. Moreover, there was also a dramatic increase in water vapor permeability (WVP) with an increase in temperature from 35 to 40°C for the shape memory hydrophilic polyurethane basement membranes. Two different procedures for WVP test were employed to simulate different application situations of the composite membranes. The temperature-sensitive water vapor permeability of composite polymer membranes was investigated by varying the content of hydrogel micro-particles. All of the temperaturesensitive membranes could have water vapor permeability controlled in response to temperature changes.

Lijing Wang. (2008). Temperature-sensitive Composite Membranes with "Double Switch" on Water Vapor Permeability. Journal of Fiber Bioengineering and Informatics. 1 (3). 233-238. doi:10.3993/jfbi12200809