The double lamellae morphology of poly (ethylene oxide) was investigated by using transmission electron microscopy (TEM) and differential scanning calorimetry(DSC). The double lamellae were observed in the crystallization temperature region 54-56℃

above 56℃ both double lamellae and single layer lamellae were formed

but below 54 ℃ only single layer lamellae could be found. The melting point of double lamellae crystals was found to be slightly higher than single layer lamellae. On the basis of the transformation of nonintegral folede-chain (NIF) crystals into integral folded-chain(IF) crystals

the growth processes of double lamellae and single layer lamellae is discussed.H bonds on facing folded chain crystal surfaces leda to a decrease of surface free energy and this fact is a main reason for the formation of double lamellae.