Investigation on the structure and crystallization behavior of controlled-rheology polypropylene with different stereo-defect distribution

The results showed that as the content of dicumyl peroxide increased, the melt flow indexes, the crystallization temperature and crystallization rate of PP increased gradually, the crystallization peak width became narrower, and the crystallite size decreased

Jian Kang

2013

Scholarcy highlights

  • Understanding concerning the influence of peroxide degradation on the stereo-defect distribution and related crystallization kinetics of controlled-rheology polypropylene are of great importance
  • The results showed that as the content of dicumyl peroxide increased, the melt flow indexes, the crystallization temperature and crystallization rate of PP increased gradually, the crystallization peak width became narrower, and the crystallite size decreased
  • The addition of DCP greatly restrained the formation of thick lamellae and narrowed its stereo-defect distribution
  • Results showed that PP resins with different stereo-defect distribution have similar MFI variations after degradation
  • PP-A and its degradation products still possess higher crystallization rate, stronger crystallizability, smaller crystallite size and higher fractions of long meso-sequence length, compared with their counterparts of PP-B

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