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24. Iridescence from tuned microstructures in poly(octamethylene terephthalate).

Author

Yu-Zhe Huang, Nagarajan, Selvaraj, Rahmyanti, Widyantari, Li-Ting Lee, and Woo, Eamor M.

Subjects
*SCANNING electron microscopy, *MICROSCOPY, *MICROSTRUCTURE, *PHOTONICS, *OPTICAL gratings
Abstract

Poly(octamethylene terephthalate) (POT), self-assembled with periodically banded aggregates, are analyzed using polarized-light optical microscopy and scanning electron microscopy. POT can display banded spherulites (with blue/orange tint colors), depending on crystallization temperature. 3D interior morphology dissection is conducted to reveal the gratinglike architecture of POT periodically banded crystal aggregates. The grating assembly is composed of onion-like layers (i.e., corrugate-board cross-hatches), with distinctly discontinuous interfaces existing between the successive layers, and each layer is composed of tangential-oriented fibrous lamellae and plate-like radial-oriented ones. Novel findings confirm that the interior gratings of ring-banded POT are comparable to the grating micro-structures commonly seen in nature's biospecies such as butterfly's wings. The POT microstructures could be finely modulated and tailored-made to functional applications as interfacial coating materials for performing photonics iridescence. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Dendritic polymer spherulites: birefringence correlating with lamellae assembly and origins of superimposed ring bands.

Author

Woo, E. M., Lugito, Graecia, and Nagarajan, Selvaraj

Subjects
SPHERULITES (Polymers), CRYSTAL whiskers, CRYSTALLIZATION kinetics, MOLECULAR weights, SINGLE crystals, CRYSTAL structure, CRYSTALLIZATION, BIREFRINGENCE
Abstract

Dendritic spherulites are one type of diversified ways of crystal aggregations into micrometer-size consortia by kinetics-driven assembly from nanometer-size crystal plates (i.e., lamellae or single crystals). Crystallized polymers can exist in states of different degrees of order, which lead to the resulting assembled morphologies are of non-equilibrium supramolecular hierarchical patterns of crystal structures. Diffusion-controlled growth patterns emerge, which change the details of dendritic morphology depending on Tc (degree of super-cooling), polymer-diluent interactions, confinement. Investigation to the diversified patterns of lamellar assembly into polymer dendritic spherulites has come to several key conclusions. This article reviews and summarizes the top-surface-relief morphology and interior dissections of polymer dendritic spherulites, where the dendrites may be composed of ringed stripes or fibrous cilia crystals. The results yield interesting consistency for constructing workable mechanisms to account for each type of morphologies with respect to their molecular weights and crystallization kinetics conditions (i.e., Tc, space confinements, film thickness, blend interaction, as well as blend composition). [ABSTRACT FROM AUTHOR]

Published
2020
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49. List of Contributors

Author

Arif P., Mohammed, Bao, Suping, Bhoje Gowd, E., Bin, Yuezhen, Chen, Hsin-Lung, Cyras, V.P., D'Amico, D.A., Das, Sonalee, Kalarikkal, Nandakumar, Krishnan, Deepthi, Langhe, Deepak, Larrañaga, Aitor, Liang, Guodong, Liu, Chien-Liang, Lizundia, Erlantz, Manfredi, L.B., Mohanty, Smita, Mugica, Agurtzane, Müller, Alejandro J., Murthy, N. Sanjeeva, Nagarajan, Selvaraj, Nandan, Bhanu, Nayak, Sanjay K., Palacios, Jordana K., Pan, Pengju, Prud'homme, Robert E., Qiu, Zhaobin, Samal, Sushanta K., Samanta, Pratick, Schultz, Jerold M., Shalu, Singh, Rajendra Kumar, Sivaprasad, Vijayan Pillai, Song, Ping, Thomas, Sabu, Tien, Nguyen-Dung, Wang, Hai, Wei, Zhiyong, Xie, Qing, Yu, Chengtao, Zhu, Fangming, and Zubitur, Manuela

Published
2018
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