Abstract
Nascent form of random propylene/1-pentene copolymers was studied for the first time by Raman spectroscopy. For the purpose of detailed interpretation of the copolymer spectra, we investigated Raman spectra of neat PP with low and high crystallinity. It was found that the copolymer Raman spectra depend on the 1-pentene content. We registered the most significant spectral alterations in two lines at 809 and 841 cm−1. The first line corresponds to vibrations of polypropylene (PP) isotactic chains in the crystalline phase, while the second one is associated with vibrations of PP isotactic chains having isomeric defects. We found out that increase in the 1-pentene content results in reduction of the copolymer crystallinity and in the content of isotactic chains in the copolymer amorphous phase.
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