Vibrational dynamics and heat capacity of syndiotactic poly(4-methyl-1-pentene)

Vibrational dynamics and heat capacity in syndiotactic poly(propylene) form II

“…Such situation is also observed in other syndiotactic polymers [19]. It may arise when the PED of the two modes tends to overlap towards the zone boundary.…”

“…This is true in case of polytetrafluroethylene [23], polystyrene [22] and poly(4-methyl, pentene 1) [19]. The modes calculated at 1158 and 1121 cm K1 at the zone center corresponding to the observed peak at 1153 and 1130 cm K1 , respectively, are coupled modes of C a -C b side chain and C a -C d backbone stretches.…”

“…The frequencies of vibrations have been calculated for phase values ranging from 0 to p at an interval of .05p. Initially, force constants were transferred from syndiotactic poly (4-methyl, 1-pentene) [19] and then modified to obtain the 'best fit' to the observed infrared (FTIR) spectra [7]. The final force constants along with the internal coordinate are given in Table 1.…”

Preparation of a porous structure in a poly(4‐methyl‐1‐pentene)/diphenyl ether system with a thermally induced phase‐separation method

“…Pande et al 16 studied normal modes and their dispersion for TPX. The structure of TPX is shown in Figure 1.…”

Normal Modes and Their Dispersion in α Form of Nylon-6 (αNY6)

“…As for the vibrations of the amide groups, in -poly (L-Ornithine), 23 -poly (O-Acetyl, L-Serine), 24 polyglycine I 22 and poly (L-Serine) 25 the amide modes of all these polymers are in the same wave number range. The minor differences are because of the number of intervening CH 2 groups that affect the long range interaction.…”