Summary: Nascent form of random copolymers of propylene with ethylene, 1-butene, 1-hexene, 1-octene, and 4-methyl-1-pentene was studied by Raman spectroscopy. The most significant spectral alterations with a change in propylene content were observed in two lines at 809 and 841 cm À1. The first line corresponds to vibrations of polypropylene helical chains in the crystalline phase, while the second one is associated with vibrations of polypropylene helical chains having isomeric defects. Raman data confirm that conformational composition and phase state of copolymer macromolecules strongly depend on the comonomer content as well as on the size of the comonomer units.

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Polypropylene (PP) is one of the most important polymeric materials. At present, this plastic is second only to polyethylene in world volume of consumption [1]. Isotactic polypropylene (IPP) is used in the building industry, in the motor industry, in the aircraft industry, in agriculture, in the textiles industry, in medicine, and so on. There are now about 80 different grades of PP.

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