W.a.x.s. and force field constrained RIETVELD modelling of meta-linked fully aromatic copolyesters: 1. Poly(p-phenylene isophthalate)

Molecular dynamics in semifluorinated side-chain polyesters as studied by broadband dielectric spectroscopy

“…3) in accordance with other studies [31e33]. The temperature dependence of its relaxation time t can be described by the Arrhenius equation, [24]. f See also Ref.…”

“…T g shifts to lower temperatures with increasing length of the diol in the backbone. In contrast, the fully aromatic polymer 1 does not show any thermal transition over the entire temperature range of measurement (highly crystalline [24], no T g in DSC visible, but expected to be w150 C [25] and weak effects in SAXS (compare Table 3)).…”

Effect of nanoscale diamondoids on the thermomechanical and morphological behaviors of polypropylene and polycarbonate

“…The Bragg reflections at 14.2, 17, 18.7, and 22° correspond to the indexed planes for the monoclinic crystals of polypropylene (α form), (110), (040), (130), and (131) + (041), and for trigonal crystals (minor β form), the Bragg angle of 21° corresponds to the index reflection of (301). The Bragg reflections at 25.7 and 29.1° correspond to (060) and (220) of the α phase 45–48. Polypropylene and the polypropylene composites also show a minor Bragg reflection at 43°.…”

“…Figure 10 illustrates the WAXD patterns of an unfilled isotactic polypropylene sample and its (060) and (220) of the a phase. [45][46][47][48] Polypropylene and the polypropylene composites also show a minor Bragg reflection at 438. A comparison of the WAXD profiles indicates that all peaks of polypropylene are retained in the diamondoid/polypropylene composites (Fig.…”

Structures and phase transformations of odd-numbered asymmetric main-chain liquid crystalline polyesters

“…In order to tune these properties, main-chain LC polymers, comprised of flexible alkylene spacers between rigid and controlled aromatic units, with various chemical structures and molecular architectures for both mesogenic groups and flexible spacers have been designed [1][2][3][4][5][6][7][8][9][10][11]. It is common to tailor LC stabilities by selecting different mesogenic groups, varying the location of the mesogens, and altering the lengths and types of flexible spacers in the LC polymers.…”