Deformation structure of the crazing type in a dispersion-filled polyethylene

Mikhler, G.; Tovmasyan, Yu. M.; Topolkaraev, V. A.; Dubnikova, I. L.; Shmidt, V. M.

doi:10.1007/bf00608148

Cited by 4 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior could be explained as follows: the impact strength was higher for the heterophasic copolymer because, besides the EVA content, it has higher elastomeric regions from the EP phase distributed into the PP matrix. This heterophasic copolymer characteristic would enhance the impact strength by transmitting and dissipating this stress into the elastomeric phases of the PP‐EP system 37, 38. On the other hand, elongation at break was higher for the PP‐ r ‐EP blend over the entire composition range which could be attributed to physical entanglements between the copolymer phases (mostly amorphous) or debonding mechanism between phases that allows a higher molecular sliding and deformation.…”

Section: Resultsmentioning

confidence: 99%

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Ramı́rez-Vargas

Huerta-Martínez

Medellín‐Rodríguez

et al. 2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

Compatibility mechanisms between EVA and PP copolymers (C-PP) blends have been studied as a function of the type of copolymer, using a heterophasic PP copolymer (PP-EP) and a random PP copolymer (PP-r-EP), with similar ethylene content. The morphology and thermal and mechanical properties of PP/EVA blends with different levels of EVA containing 28% vinyl acetate (VA) were determined. The obtained results indicated compatibility for both systems showing interactions at the amorphous interfaces; however, this interaction was higher for the PP-r-EP/EVA, which showed a single glass transition temperature and changes in the PP crystalline fraction (changes in the fusion temperature and in the diffraction patterns). The evolution of the morphology from isolated spherical domains (20% EVA) to elongated shapes (40% EVA) was related to the observed changes in thermal and mechanical properties. The impact strength and deformation properties showed significant improvement with increasing EVA content above 40% where the highest values of elongation for the PP-r-EPand of impact strength for the PP-EP were obtained.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Ramı́rez-Vargas

Huerta-Martínez

Medellín‐Rodríguez

et al. 2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The transition to uniform yielding was explained by weak adhesion between the filler and the polymer leading to debonding of the particles from the polymer (8). On the micro-scopic scale, yield was not uniform and consisted in growth of craze-like structures (8, 14).…”

Section: Introductionmentioning

confidence: 99%

The effect of particles on failure modes of filled polymers

Баженов

1995

Polymer Engineering & Sci

View full text Add to dashboard Cite

The effect of rigid particles on the fracture mode of polymers that yield with necking was analyzed theoretically with a model of regularly arrayed spherical particles. The adhesion between a polymer and particles was assumed to be weak, and particles were assumed to debond from the polymer before necking. A linear decrease in engineering draw stress with an increase in the filler content was derived. An increase in filler content leads to a transition in deformation mechanism. The transition depends on the ability of the polymer to strain-harden. If the ability to strain-harden is insignificant and the engineering fracture stress (strength) of the polymer is lower than its yield stress, the transition is from ductile to brittle fracture. If the ability to strain-harden is essential and the strength of the unfilled polymer is higher than its yield stress, the transition (ductile-to-ductile) is from neck propagation to uniform ductile yield. The critical filler contents were determined for both transitions from the properties of an unfilled polymer. The ductile-to-ductile transition without embrittlement is possible if the strength of the unfilled polymer is higher than its yield stress. Results for polymers filled by weakly bonded particles were compared with polymers filled by particles that debond after the yield stress.

show abstract

Ductility of filled polymers

Баженов

Hiltner

et al. 1994

J of Applied Polymer Sci

View full text Add to dashboard Cite

SYNOPSISThe ductility of a calcium carbonate-filled amorphous copolyester PETG in a uniaxial tensile test was examined as a function of the filler volume fraction. A ductile-to-quasibrittle transition occurred as the volume fraction of filler increased. This transition was from propagation of a stable neck through the entire gauge length of the specimen to fracture in the neck without propagation. The draw stress (lower yield stress) did not depend on the filler content and was equal to the draw stress of the unfilled polymer. It was therefore possible to use a simple model to predict the dependence of the fracture strain on the filler volume fraction. It was proposed that when the fracture strain decreases to the draw strain of the polymer the fracture mechanism changes and the fracture strain drops sharply. The critical filler content a t which the fracture mode changes is determined primarily by the degree of strain-hardening of the polymer.

show abstract

Deformation structure of the crazing type in a dispersion-filled polyethylene

Cited by 4 publications

References 5 publications

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

The effect of particles on failure modes of filled polymers

Ductility of filled polymers

Contact Info

Product

Resources

About