Isothermal crystallization of nylon 6/liquid crystal copolyester blends

An Unusual Crystallization Behavior in Polyamide 6/Montmorillonite Nanocomposites

“…[13] The a-form exhibited two reflection peaks at 2h = 20.1 8 and 23.9 8, and there was only one reflection peak at 2h = 21.7 8 for the c-form. [8,13] In practice, PA6 can exhibit either the a-form under slow cooling (Figure 2, curve A and curve B) or the co-existence of a-and c-form under rapid cooling (Figure 2, curve C). This is a result of the large difference in the required crystallization time.…”

“…[2][3][4][5][6][7] The more stable room-temperature crystalline structure of PA6, denoted as the a-phase, consists of an all-trans chain conformation hydrogen-bonded into sheets (acplane); the intersheet stacking is controlled by van der Waals interactions. [8][9][10] Adjacent intrasheet chains are antiparallel, where the intrasheet hydrogen bonds shear in an alternating manner. For the c-form of PA6, the chains are parallel and the hydrogen bonding occurs between chains in adjacent sheets.…”

Thermal properties, structure and morphology of PEEK/thermotropic liquid crystalline polymer blends

“…Although there are many studies on polymer blends in which one component is liquid crystalline in nature, the majority is concerned with rheological, mechanical and morphological characteristics. However, detailed investigations of the structure and thermal properties of this type of blend are relatively scarce 9, 12–17. In this work we have investigated the thermal, structural and morphological behaviour of blends based on poly(aryl ether ether ketone), PEEK, and a thermotropic liquid crystalline polymer, Vectra ® , with special emphasis on the effect of the crystallization conditions and blend composition.…”

“…We have employed a combination of techniques, including differential scanning calorimetry, optical microscopy and X‐ray diffraction using synchrotron radiation. The use of synchrotron radiation allows us to obtain wide‐ and small‐angle X‐ray diffraction (WAXS and SAXS, respectively) measurements in real time during polymer crystallization,18, 19 and simultaneous WAXS and SAXS experiments are an ideal tool to follow the rapid structural changes during crystallization and melting of polymer blends 15–17, 20…”

Preparation of Polyesteramides in a Reactive Extrusion Process

“…The peak at 0.2420 Å −1 is assigned to a superposition of the 110 PCLO reflection and 100/010 reflection of the PCLA γ‐phase, which is located at a slightly higher s , i.e. at 0.2434 Å −1 …”