Fracture resistance improvement of polypropylene by joint action of core–shell particles and nucleating agent

Effects of toughening propylene/ethylene graft copolymer on the crystallization behavior and mechanical properties of polypropylene random-copolymerized with a small amount of ethylene

“…For neat PPR, an obviously flat and smooth surface without any appreciable plastic deformation was observed across the whole fractured surface, indicating the typical topography resulting from brittle-fracture. This reflects that both the crack initiation and propagation occurred at a rapid rate in the neat PPR [11]. For the PEGC-modified PPR, the surface topography was completely different; the surfaces were coarsened compared with the neat PPR specimen, and some micro voids with diameters ranging from 50 to 120 mm were present due to the debonding of PEGC particles from PPR matrix.…”

Crystallization Behavior and Properties of Glass Fiber Reinforced Polypropylene Composites

“…The Cu K-alpha irradiation source was operated at 40 KV and 100 mA. The K value representing the β-form content in PP was determined from X-ray diffractograms according to Turner-Jones et al [14]. Kβ=Hsans-serifβfalse(300false)Hsans-serifαfalse(110false)+Hsans-serifαfalse(040false)+Hsans-serifαfalse(130false)+Hsans-serifβfalse(300false) where H α(110) , H α(040) and H α(130) are intensities of α-diffraction peaks corresponding to 2θ angles 14.2°, 17.0° and 18.8°, respectively, and H β(300) is the intensity of β-diffraction peak at 2θ angle 16.2°.…”

“…The α-form owns higher strength and modulus while the β-form yields better toughness but lower stiffness. The introduction of β-form crystal is one of the most effective methods to improve the toughness of PP [7,14,15,16]. Cui et al have introduced N,N-dicyclohexyl-2,6-napthalene-dicarboxamide (TMB-5) into maleic anhydride-grafted polypropylene (PP-g-MAH) by extrusion blending, which lead to great increase of the mechanical properties [8].…”

Isotactic polypropylene (PP) modified by ABS and CaCO3 nanoparticles: effect of composition and compatibilization on the phase morphology, mechanical properties and fracture behavior

“…Thus, to provide more detailed information about the impact fracture process of the different samples, the overall impact-fractured surfaces were sub-classified as crack initiation zone (zone A), the initial stage of crack propagation (zone B) and the terminal stage of the crack propagation (zone C) as shown in the first image of Fig. 11, according to the analysis utilized by others [35][36][37].…”