%0 conference lecture %@ %A Budd, P.M., McKeown, N.B., Bader, G.S., Fritsch, D., Yampolskii, Y., Shantarovich, V. %D 2009 %J 238th ACS National Meeting & Exposition, Division of Polymer Chemistry %T Gas separation membranes from polyimides incorporating spiro-centers %U %X