Surface Grafting
Surface Grafting is a grafting reaction system involving a surface and a grafting medium containing a monomer. This system is based on forming free radicals. The surface is activated with free radicals and placed in contact with the monomer, in solution under very specific temperature and time conditions. The effect of activation is to create surface radical species, from which the monomer polymerization reaction proceeds. (Chatelin and Gavet, US Patent 5,266,632, 11/30/1993
Recent Journal Articles
Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation
(1470–1484)AIChE Journal 57 #6 (2011)
Wang, Chung and Wang of the National University of Singapore, China, synthesized a novel cyclodextrin (CD) derivative, m-xylenediamine-β-cyclodextrin (m-XDA-β-CD) which was grafted to a membrane surface for the pervaporation separation of butanol isomers. The as-fabricated novel CD-grafted polyamide-imide (PAI) membranes show homogeneous morphology and significant improved separation performance as compared to the unmodified PAI membranes and PAI/CD mixed matrix membranes made of physical blends. The optimal separation performance can be found with the CD-grafted PAI membrane cast from a 22 wt % dope concentration, which exhibits a total butanol flux of 15 g/m2/h and a separation factor of 2.03. This newly developed membrane with surface-immobilized CD may open new perspective for the development of next-generation high-performance pervaporation membranes for liquid separations. (RDC 5/5/2011)