The crystal structure of poly (hexamethylene trans-1, 4-cyclohexane dicarboxylate) (PHCE) was determined by X-ray fiber diffraction. Only one crystal form was observed, independent of the crystallization condition. The PHCE has a triclinic unit cell with the space group P1. The cell parameters are: a = 5.47 & Aring;, b = 7.36 & Aring;, c = 15.95 & Aring;, alpha = 141.14 degrees, beta = 113.69 degrees, gamma = 60.70 degrees. One chain passes through a unit cell, resulting in a crystal density of 1.203 g/cm3. To study the crystal habit, the morphology of PHCE films was studied by imaging techniques. Depending on film thickness and crystallization temperature, the morphology varied from single crystals, S-shaped crystals, branched single-layer bent crystals, branched multilayer bent single crystals, and spherulites. By investigating the crystal growth rates, two scenarios were observed, characterized by diffusion-controlled growth or secondary nucleation. The interplay between crystal bending and chain tilting was investigated by electron diffraction.
Hu, W., Ma, T., Zhou, Y., Soccio, M., Lotti, N., Cavallo, D., et al. (2025). Crystal structure and crystalline morphology of poly(hexamethylene trans-1,4-cyclohexane dicarboxylate). POLYMER, 327, 1-16 [10.1016/j.polymer.2025.128354].
Crystal structure and crystalline morphology of poly(hexamethylene trans-1,4-cyclohexane dicarboxylate)
Soccio M.;Lotti N.;
2025
Abstract
The crystal structure of poly (hexamethylene trans-1, 4-cyclohexane dicarboxylate) (PHCE) was determined by X-ray fiber diffraction. Only one crystal form was observed, independent of the crystallization condition. The PHCE has a triclinic unit cell with the space group P1. The cell parameters are: a = 5.47 & Aring;, b = 7.36 & Aring;, c = 15.95 & Aring;, alpha = 141.14 degrees, beta = 113.69 degrees, gamma = 60.70 degrees. One chain passes through a unit cell, resulting in a crystal density of 1.203 g/cm3. To study the crystal habit, the morphology of PHCE films was studied by imaging techniques. Depending on film thickness and crystallization temperature, the morphology varied from single crystals, S-shaped crystals, branched single-layer bent crystals, branched multilayer bent single crystals, and spherulites. By investigating the crystal growth rates, two scenarios were observed, characterized by diffusion-controlled growth or secondary nucleation. The interplay between crystal bending and chain tilting was investigated by electron diffraction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
