Contents

09 November 1984
Vol 226, Issue 4675

About The Cover

Polymeric structural materials such as composites of “Kevlar” aramid or carbon fiber and resins are replacing metals in many aerospace applications. The high strength of the fibers in these composites depends on a molecular morphology which takes maximum advantage of the strength of the individual polymeric molecules. See page 642. [E. I. duPont de Nemours and Company, Inc., Wilmington, Delaware 19898]