Chemical and morphological alterations effected by methylamine reactions on polyesters

Graecia Lugito, Lai Yen Wang, Eamor M. Woo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Etching agents, including methylamine (MA) and several others, are used in many studies for exposing the crystal assembly in contrast to amorphous domains in polymer samples, for better morphology contrast. The selection of etching agents must be careful, so as not to alter the original chemical and crystal nature; otherwise misinterpretation may be a consequence. Apparently, the MA-vapor treatment does not simply just induce physical etching through peeling off a covered layer from the polymer samples as many investigators so believed, but also causes severe chemical changes in many aliphatic and aromatic polymers. The chemical reactions between MA and the polyesters ultimately lead to different chemical structures, alteration in spherulites and lamellae, and sometimes completely different lamellar structures with a different melting peak, with -C(=O)O- in the polymers being replaced with -C(=O)NH- bonding. This study uses three examples of polyesters to amply exemplify the necessity of due care in avoiding chemical etching.

Original languageEnglish
Pages (from-to)1297-1305
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume215
Issue number13
DOIs
Publication statusPublished - 2014 Jul

All Science Journal Classification (ASJC) codes

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

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