An investigation on the impact fracture characteristics of EPR toughened polypropylene

Mechanical properties of PP-LDPE blends with novel morphologies produced with a continuous chaotic advection blender

“…It was, therefore, selected for this study as an appropriate major component polymer. Some degree of success has been achieved in modification of PP using rubber additives [16][17][18][19][20][21], but noticeable reductions in stiffness and scratch/mar resistance can occur in the resulting blends [22]. Blends of PP and low density polyethylene (LDPE) may give a better balance between toughness improvements and stiffness reductions.…”

Controlled properties of high-impact polypropylene in-reactor alloys by tailoring chemical structure and morphology

“…Thus, the intrinsic viscosity ratio λ of HiPP-A sample was also higher than that of HiPP-B sample. The more similar the viscosities of the XS and XIS components, the better is the dispersion of the disperse phase in the HiPP in-reactor alloys, and the smaller is the dimension of the disperse phase [7,8]. In Table 4 the intrinsic viscosity ratio (λ = 1.60) of the HiPP-B sample was smaller than that (λ = 2.86) of the HiPP-A sample, which indicates that the dispersion of HiPP-B sample should be better than that of HiPP-A sample.…”

“…Therefore, the modification of iPP aimed at improving impact strength is a continuing topic of great significance in academia and industry. One efficient way to improve the impact strength of iPP is to add an elastomer or ethylene copolymer to the iPP matrix [5][6][7][8]. Among the ways to overcome the poor impact strength, the in-reactor blending of iPP with other polyolefins (especially ethylene-propylene rubber, EPR) by sequential multistage polymerization has proved to be the best method for the impact strength improvement of iPP.…”

The mechanical properties of oxyfluorinated hybrids of glass fibre and polypropylene fibre

“…3 and 9 it is seen that there is a similarity except that the interlaminar shear strength is generally higher. The discrepancy is assumed to be strain rate dependent since polypropylene loaded under impact exhibits a transition from ductile to brittle behaviour as the loading rate is increased [10,11]. The improvement in initial impact resistance, and hence absorbed energy prior to peak load, in the hybrids is probably due to initiation of the tearing process in the polypropylene as it separates from the matrix.…”