Grafting of polymers from clay nanoparticles via in situ free radical surface-initiated polymerization: Monocationic versus bicationic initiators

Xiaowu Fan, Chuanjun Xia, Rigoberto C. Advincula

Research output: Contribution to journalArticle

115 Citations (Scopus)

Abstract

Surface-initiated polymerization (SIP) from clay nanoparticles was compared between surface-bound mono- and bicationic free radical initiators. Distinct properties in molecular weight (MW), extent of exfoliation, and particle morphology were observed as a consequence of using two different initiator architectures. X-ray diffraction (XRD) results showed that the clay intercalated with monocationic initiator has a larger d spacing and gave a more ordered structure. IR, X-ray photoelectron spectroscopy, and qualitative thermogravimetric analysis confirmed the attachment of both initiators. XRD further showed that the SIP product from the bicationic initiator retained some intercalated structure while a highly exfoliated structure is achieved by the SIP through the monocationic initiator. Consequently the monocationic initiator gave a higher MW polymer. We have found that well-dispersed intercalated clay particles and efficient monomer diffusion are crucial factors in performing a successful SIP and in achieving an exfoliated clay structure.

Original languageEnglish
Pages (from-to)4381-4389
Number of pages9
JournalLangmuir
Volume19
Issue number10
DOIs
Publication statusPublished - 2003 May 13
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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