Exfoliation of layered silicate facilitated by ring-opening reaction of cyclic oligomers in PET-clay nanocomposites

Sang-Soo Lee, Young Tae Ma, Hee Woo Rhee, Junkyung Kim

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Ethylene terephthalate cyclic oligomers (ETCs) have been successfully polymerized to a high molecular weight poly(ethylene terephthalate) (PET) employing the advantages of the low viscosity of cyclic oligomers and lack of chemical emissions during polymerization. Using ring-opening polymerization of ETCs with organically modified montmorillonite (OMMT), we intend to ascertain the possibility of preparing high performance PET/clay nanocomposites. Due to the low molecular weight and viscosity, ETCs are successfully intercalated to the clay gallerys, what is evidenced by XRD showing a down-shift of basal plane peak of layered silicate along with TEM investigation. Subsequent ring-opening polymerization of ETCs in-between silicate layers yielded a PET matrix of high molecular weight along with high disruption of layered silicate structure and homogeneous dispersion of the latter in the matrix. Although co-existence of exfoliation and intercalation states of silicate layers after polymerization of ETCs rather than perfect exfoliation was observed, a dramatic increase in d-spacing along with fast polymerization presents us a great potential of cyclic oligomer process in producing a thermoplastic polymer-clay nanocomposites of extremely well-dispersed silicate nanoplatelets and the corresponding high performances.

Original languageEnglish
Pages (from-to)2201-2210
Number of pages10
JournalPolymer
Volume46
Issue number7
DOIs
Publication statusPublished - 2005 Mar 10

Fingerprint

Silicates
Oligomers
Nanocomposites
Clay
Molecular weight
Ring opening polymerization
Polymerization
Viscosity
Bentonite
Polyethylene Terephthalates
Intercalation
Clay minerals
Polyethylene terephthalates
Thermoplastics
Polymers
Ethylene
clay
Transmission electron microscopy

Keywords

  • Cyclic oligomer
  • Nanocomposite
  • Ring-opening polymerization

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Exfoliation of layered silicate facilitated by ring-opening reaction of cyclic oligomers in PET-clay nanocomposites. / Lee, Sang-Soo; Ma, Young Tae; Rhee, Hee Woo; Kim, Junkyung.

In: Polymer, Vol. 46, No. 7, 10.03.2005, p. 2201-2210.

Research output: Contribution to journalArticle

Lee, Sang-Soo ; Ma, Young Tae ; Rhee, Hee Woo ; Kim, Junkyung. / Exfoliation of layered silicate facilitated by ring-opening reaction of cyclic oligomers in PET-clay nanocomposites. In: Polymer. 2005 ; Vol. 46, No. 7. pp. 2201-2210.
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