Publication brief: Polymer: in-situ spectroscopic and thermal analyses of phase domains in high-impact polypropylene

Key results

  • AFM-IR opens a new avenue of direct investigation into domain composition and structure of high-impact polypropylene (HIPP)
  • Thermal analysis and nanoIR spectroscopy unambiguously identified the composition of the HIPP nanodomains to contain both polyethylene and polypropylene, depending on environmental and physiological factors.

Key words

Polypropylene | alloys | composition | microstructure | spectroscopy


F. Tang, P. Bao, A. Roy, Y. Wang, Z. Su


High-impact polypropylene (HIPP) is a commercially important polymer alloy with complex morphological structure. In this contribution, two commercial HIPPs have been investigated in detail by atomic force microscopy-infrared in conjunction with local thermal analysis to determine the composition and structure of the nanodomains. Both alloys contain numerous core-shell rubber particles dispersed in polypropylene matrix. In HIPP-1, the rigid cores of the particles are rich in polypropylene, which is highly crystalline, whereas for HIPP-2, the major component of the rigid cores is polyethylene with a high degree of crystallinity. The formation of these very different structures and compositions in the core and rubber domains may be attributed to different chain structures and compositions of the copolymers in the alloys produced by different catalysts.

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