Tannin induced single crystalline morphology in poly(ethylene succinate)

I. Han Huang, Ling Chang, Eamor M. Woo

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Polarized-light optical microscopy (POM), wide-angle X-ray diffraction (WAXD), and atomic-force microscopy (AFM) are used to analyze the crystalline morphology in poly(ethylene succinate) (PESu) interacting with hydrogen-bonding biodegradable tannin (TA). Upon interactions with TA via strong intermolecular H-bonding capacity with PESu, the regular Maltese-cross spherulites in PESu gradually transform to a pattern of maple leaves (10 wt.-% TA). At 20 wt.-% TA, the crystal patterns assume a highly dendritic seaweed shape (with the branches perpendicular to main stalks). Detailed characterization using AFM analyses showed that the minute crystal entities in the seaweed-like dendrite crystals are flat-on and take a multilayer diamond (lenticule) geometry approaching the shape of single crystals in PESu. The trend of variation with increasing TA is equivalent to decreasing the film thickness in the neat PESu. The diamond-shape flat-on crystals are packed into a terrace structure resembling a pyramid, indicating that multiple single crystals are stacked with partial overlapping. The strong H-bonding interaction between TA and PESu, assisted by a confined thickness, induces a single-crystal packing, which is equivalent to crystallization into discrete single crystals in dilute solutions. Atomic-force microscopy (AFM) analysis shows the minute crystal of PESu/TA blend entities in the seaweed-like dendrite crystals are packed into a terrace structure resembling a pyramid. The strong H-bonding interaction between PESu and TA, assisted by a confined thickness, induces a single-crystal packing, which is equivalent to crystallization into discrete single crystals in dilute solutions.

Original languageEnglish
Pages (from-to)1155-1164
Number of pages10
JournalMacromolecular Chemistry and Physics
Volume212
Issue number11
DOIs
Publication statusPublished - 2011 Jun 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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