Behaviour of the miscibility of poly(ethylene oxide)/liquid crystal blends

Rodrigues, J. R. S.; Kaito, Akira; Soldi, Valdir; Pires, Alfredo T. N.

doi:10.1002/(sici)1097-0126(199806)46:2<138::aid-pi977>3.3.co;2-u

Cited by 2 publications

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“…Additionally, the crystallization enthalpy (Δ H c ) of PBA decreases from 99.6 to 90.1 J/g and its melting enthalpy (Δ H m ) decreases from 102.6 to 91.3 J/g as f 5CB increases from 0 to 0.3. The depression of T m of PBA in the PBA/5CB blend also demonstrates that PBA and 5CB are miscible in their blends …”

Section: Resultsmentioning

confidence: 85%

Polymorphic crystalline structure and diversified crystalline morphology of poly(butylene adipate) blended with low‐molecular‐mass liquid crystals

Zheng

Bao

et al. 2020

Polymer Crystallization

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Due to the multiple phase transition of liquid crystal, the semicrystalline polymer would exhibit the diversified crystalline structure and morphology in its mixture with liquid crystals. Herein, we choose polymorphic poly(butylene adipate) (PBA) as a model semicrystalline polymer, 4-cyano-4 0 -n-pentylbiphenyl (5CB) as a liquid crystalline diluter and studied the crystallization kinetics, polymorphic crystalline structure, crystalline structural transition, and crystalline morphology of PBA/5CB mixtures. The spherulitic growth rate and crystallization rate of PBA decrease after mixing with 5CB, attributing to the dilution effect of liquid crystals. Compared to neat PBA, the formation of thermodynamically stable α crystals is favored in the PBA/5CB blend at the same crystallization temperature (T c ), ascribed to the depression of equilibrium melting temperature of PBA. The heating-induced β-to-α transition of PBA crystals shifts to lower temperature in the PBA/5CB blend compared to the neat PBA. The crystalline morphology of PBA is strongly influenced by the incorporation of 5CB. The long period of PBA crystals enhances with the addition of a small amount of 5CB, due to the interlamellar segregation of 5CB in PBA crystals. The distribution of 5CB changes from the interlamellar to interspherulitic or interfibrillar regions of PBA crystals as the 5CB content increases in the PBA/5CB blend. K E Y W O R D S crystalline morphology, crystalline structure, liquid crystal, poly(butylene adipate)

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