Nucleation of isotactic polypropylene with metal monoglycerolates

Amita Bhatia, Vidura N. Jayaratne, George P. Simon, Graham H. Edward, Terence W. Turney

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

Isotactic polypropylene (iPP) has been modified with various nucleating agents, based on layered metal monoglycerolate complexes. Increased crystallisation temperatures (Tc) of iPP were observed in the presence of the isostructural zinc and cobalt layered monoglycerolates (ZMG & CoMG) and the structurally-related calcium monoglycerolate (CaMG), at loadings as low as 200 ppm, indicating highly effective nucleation. Optical microscopic observations showed that iPP nucleates from the thin edges/ sides of CoMG and not from the larger area flat hexagonal/rhombic surfaces of the platelets. X-ray powder diffraction (XRD) studies revealed predominantly selective a-nucleation, although small amounts of the b-phase were observed with CaMG/iPP. The (040) peak of a-phase of iPP was enhanced for nucleated injection moulded samples. Molecular modelling indicated a close structural match between the edges of nucleating platelets and a-iPP in multiple lattice directions, each with a dimensional mismatch of less than 4%.
Original languageEnglish
Pages (from-to)110 - 116
Number of pages7
JournalPolymer
Volume59
DOIs
Publication statusPublished - 2015

Keywords

  • Epitaxy
  • Nucleating Agent
  • Polypropylene

Cite this