Journal: Chemistry (Weinheim an der Bergstrasse, Germany)

Article Title: Hydrogen Bonded Dimer of an Alcohol with the Derived Carboxylic Acid Triggering their Sorption by Nanoporous-crystalline PPO Films.

doi: 10.1002/chem.202301441

Figure Lengend Snippet: Figure 6. a, b) 2D WAXD EDGE patterns and a’, b’) corresponding meridional profiles of a c⊥NC PPO film a, a’) before and b, b’) after uptake of ~14 wt% of BAL/BA dimer, from dilute BAL aqueous solution. Blue arrows, in a and b patterns, indicate the meridian of the patterns, where hk0 reflections are located for c⊥orientation.

Article Snippet: Two-dimensional (2D) wide-angle X-ray diffraction (WAXD) patterns were collected with a D8 QUEST Bruker diffractometer (CuKα radiation), by sending the X-ray beam perpendicular and parallel to the film surface, thus getting patterns that are called THROUGH and EDGE, respectively.

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Journal: Polymers

Article Title: Thermal Stability and Barrier Properties of Polyamide 6 Reinforced by Carbazole Based Copolymerization

doi: 10.3390/polym18050559

Figure Lengend Snippet: SAXS spectra of PA6 and its copolymer acyl groups. ( a ) Two-dimensional small-angle scattering patterns ( b ) SAXS one-dimensional integral curves ( c ) Lorenz calibration curve of SAXS one-dimensional integral curves.

Article Snippet: Two-dimensional small-angle X-ray scattering (SAXS) measurements were carried out on a Xeuss 3.0 platform (Xenocs, Sassenage, France).

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Journal: Chinese Journal of Polymer Science

Article Title: Synthesis and liquid crystalline behavior of side chain liquid crystalline polymers containing triphenylene discotic mesogens with different length flexible spacers

doi: 10.1007/s10118-015-1672-5

Figure Lengend Snippet: Fig. 9 The phase diagram of PMTS and PMTnS (n is the number of the alkyl spacer, n = 2, 3, 4, 6) In order to further characterize the detailed mesomorphic structures of the polymers, 2D WAXD experiments were conducted. The 2D WAXD patterns at room temperature are shown in Fig. 10. All fiber samples were drawn with a pair of tweezers at temperatures above glass-transition temperature. In this figure, the X-ray beam is perpendicular to the shear direction that is along the meridian. For PMTS, as can be seen in Fig. 10(a), a pair of diffraction arcs with d-spacing values of 1.83 nm was located on the equator. This result further confirms the conjecture on the basis of 1D WAXD experiments that the diffraction with the d-spacing of 1.83 nm in the low-angle region is the d100 of the ΦR phase. Similar to PMTS, for PMT2S (seen in Fig. 10b), PMT3S (seen in Fig. 10c), PMT4S (seen in Fig. 10d) and PMT6S (seen in Fig. 10e), a pair of diffraction arcs with d-spacing values (seen in Table 2) of 1.73 nm, 1.85 nm, 1.88 nm and 1.92 nm was located on the equator and the meridian, respectively. This result further confirms the conjecture on the basis of 1D WAXD experiments that the diffraction with the d-spacing in the low-angle region is the d100. To get a detailed investigation into the columns formed by the PMTS and PMTnS, the packing model of the columns and molecular dynamic simulation results of PMTS and PMTnS are shown in Fig. 11. From the whole tests, we found that PMTS and PMT2S exhibit a stabilized phase structure. For samples without or with short (n = 2) flexible spacer between the polymethylacrylic acid main chain and Tp moieties in the side chains the strong coupling effect overcomes the π-π interaction of Tp mesgeon. The simulated analysis of PMTS showed that the Tp side chain wrapped around the main chain to form a rectangular columnar shaped molecule with a = 1.83 nm, b = 1.65 nm, and = 90°, as shown in Fig. 11. In the columnar shaped molecule, the side chain Tp tilts an angle of ~30° off the main chain. Similar to PMTS, PMT2S showed that the Tp side chain wrapped around

Article Snippet: Two-dimensional wide-angle X-ray diffraction (2D WAXD) was carried out using a BRUKER AXS D8 Discover diffractometer with a 40 kV FL tubes as the X-ray source (Cu K) and a VANTEC 500 detector.

Techniques: Shear

Journal: Chinese Journal of Polymer Science

Article Title: Synthesis and liquid crystalline behavior of side chain liquid crystalline polymers containing triphenylene discotic mesogens with different length flexible spacers

doi: 10.1007/s10118-015-1672-5

Figure Lengend Snippet: Fig. 10 2D WAXD pattern of PMTS (a), PMT2S (b), PMT3S (c), PMT4S (d) and PMT6S (e) at room temperature with the X-ray beam perpendicular to the fiber direction

Article Snippet: Two-dimensional wide-angle X-ray diffraction (2D WAXD) was carried out using a BRUKER AXS D8 Discover diffractometer with a 40 kV FL tubes as the X-ray source (Cu K) and a VANTEC 500 detector.

Techniques: