Microbeam X-Ray Investigation of the Structural Transition from Circularly Banded to Ringless Dendritic Assemblies in Poly(Butylene Adipate) Through Dilution with Poly(Ethylene Oxide).

Selvaraj Nagarajan, Chia-I Chang, I-Chuan Lin, Yu-Syuan Chen, Chean-Cheng Su, Li-Ting Lee, Eamor M Woo

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Article in Polymers, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Selvaraj NagarajanDepartment of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.

Chia-I ChangDepartment of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.

I-Chuan LinDepartment of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.

Yu-Syuan ChenDepartment of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.

Chean-Cheng SuDepartment of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811726, Taiwan.ORCID 0000-0002-2884-6951

Li-Ting LeeDepartment of Materials Science and Engineering, Feng Chia University, Taichung 407-24, Taiwan.ORCID 0000-0002-5065-733X

Eamor M WooDepartment of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.ORCID 0000-0002-3653-2549

Funding

Taiwan's National Council of Science and Technology NSTC 112-2221-E-006 -009 -MY3

6 · The paper itself

Abstract

In this study, growth mechanisms are proposed to understand how banded dendritic crystal aggregates in poly(1,4-butylene adipate) (PBA) transform into straight dendrites upon dilution with a large quantity of poly(ethylene oxide) (PEO) (25-90 wt.%). In growth packing, crystal plates are deformed in numerous ways, such as bending, scrolling, and twisting in self-assembly, into final aggregated morphologies of periodic bands or straight dendrites. Diluting PBA with a significant amount of PEO uncovers intricate periodic banded assemblies, facilitating better structural analysis. Both circularly banded and straight dendritic PBA aggregates have similar basic lamellar patterns. In straight dendritic PBA spherulites, crystal plates can twist from edge-on to flat-on, similar to those in ring-banded spherulites. Therefore, twists-whether continuous or discontinuous-are not limited to the conventional models proposed for classical periodic-banded spherulites. Thus, it would not be universally accurate to claim that the periodic circular bands observed in polymers or small-molecule compounds are caused by continuous lamellar helix twists. Straight dendrites, which do not exhibit optical bands, may also involve alternate crystal twists or scrolls during growth. Iridescence tests are used to compare the differences in crystal assemblies of straight dendrites vs. circularly banded PBA crystals.

Indexed as

lamellar self-assemblymicrobeam X-ray analysispoly(butylene adipate)scanning electron microscopystructural colorationsynchrotron radiation

Identifiers

PMID40808088

DOI10.3390/polym17152040

PMCPMC12349629

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.