No abstract

In this review, the physical properties of composite materials are discussed; however, discussion of the mechanical properties has been excluded except when necessary for the consideration of properties such as thermal expansion or swelling and shrinkage. One of the main aims in the review has been to show how the theoretical and experimental information that is already available may be used (a) to design and construct composite materials with predetermined physical properties and (b) to ensure that the physical properties of composite materials are properly measured and properly defined.

Ion-exchange Resins in ReLatiogz to Strzbct z m . Pad I V . 3 129 599. Pyoperties of Pon-exch,ange Resins in Relation to Their Xtructure. Swelling und Xhrinkage of Xulphonated Polystyrenes of Pa,rt I V.* Different Crosslinking.

Yields of y-resorcylic acid afforded by various modifications of the Kolbe-Schmitt reaction have been explored and methods of separating the acid from the accompanying @-isomer have been studied. Selective elution of the acids from a column of an anion-exchange resin in the chloride form with solutions of hydrochloric acid in water or aqueous alcohol effects complete separation.A process for the partial conversion of Pinto y-resorcylic acid is reported.

No abstract