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Stress‐Whitening of High‐Impact Poly(propylene): Characterization and Analysis
Author(s) -
Liu Xuanbo,
Guo Meifang,
Wei Wenjun
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100008
Subject(s) - differential scanning calorimetry , materials science , dispersion (optics) , fourier transform infrared spectroscopy , polypropylene , composite material , phase (matter) , dynamic mechanical analysis , crystallization , stress (linguistics) , chemical engineering , polymer , optics , chemistry , organic chemistry , physics , thermodynamics , engineering , linguistics , philosophy
Summary: High‐impact isotactic polypropylene (hiPP) is a multiphase material and hiPP is susceptible to stress‐whitening (or blushing) when exposed to impact, tension etc. Stress‐whitening will influence the quality of the products. The object of this work is to find the factors influencing the resistance of stress whitening. Five reactor‐alloy hiPP samples were used. Stress whitening was characterized by Gardner‐type impact apparatus. Automated PP viscometer and xylence solubles analyzer (CrystEX), tapping mode atomic force microscopy (TMAFM), Fourier transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA), wide angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC) were used to characterize the samples. The stress‐whitening was found to be related with the following factors: 1.particle size of the dispersion phase (rubber phase), 2.composition of the dispersion phase, 3.crystallization in in the dispersion phase, 4.crystalline form of the matrix (iPP).