(R′—TCA) in the crystallinestate (R′—TCAs with n = 4, 5 in the glassy state) have been studied, End-group (CCl 3 COO—) vibrations have been assigned by referring to the previous results for methyl and ethyl analogs and four methylene band progressions have been analyzed. Interaction between methylene and end group vibrations is discussed. It is suggested that in the crystallinestate the nP-TCA ( n