Adding EPDM Rubber Makes Poly(propylene) Brittle

Fu, Qiang; Wang, Yong; Li, Qijun; Zhang, Gong

doi:10.1002/1439-2054(20020601)287:6<391::aid-mame391>3.0.co;2-7

Cited by 19 publications

(3 citation statements)

References 11 publications

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“…22,[24][25][26][27][28][29][30][31] It is well known that an LCST phase diagram can be precisely identified from rheological measurements through the dynamic temperature ramp of the storage modulus (G 0 ), loss modulus (G 00 ), and complex viscosity. 22,[24][25][26][27][28][29][30][31] It is well known that an LCST phase diagram can be precisely identified from rheological measurements through the dynamic temperature ramp of the storage modulus (G 0 ), loss modulus (G 00 ), and complex viscosity.…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)–acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties

Abolhasani

Guo

Jalali‐Arani

et al. 2013

J of Applied Polymer Sci

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A phase diagram of poly(vinylidene fluoride) (PVDF) and acrylic rubber (ACM) was plotted, and the effects of the extent of miscibility on the mechanical properties of the polymer blends were examined. A compressible, regular solution model was used to forecast the phase diagram of this blend. The model prediction, the lower critical solution temperature (LCST) over the upper critical solution temperature (UCST), was done qualitatively according to the experimentally determined phase diagram by differential scanning calorimetry (DSC), optical microscopy, and rheological analysis. These experimental methods showed that this system was miscible in ACM-rich blends (>50% ACM) and partially miscible in PVDF-rich blends. A wide-angle X-ray diffraction study revealed that PVDF/ACM blends such as neat PVDF had a characteristic a-crystalline peak. The partially miscible blends displayed up to 350% elongation at break; this was a significant increment of this parameter compared to that of neat PVDF(20%). However, the miscible blends showed elongation of up to 1000% [again, a remarkable increase compared to chemically crosslinked ACM (220%)] and displayed excellent mechanical properties and tensile strength and a large elongation at break. For the miscible and partially miscible blends, two different mechanisms were responsible for this improvement in the mechanical properties. It was suggested that in the partially miscible blends, the rubbery depletion layer between the spherulite and the conventional rubber cavitations mechanism were responsible for the increase in the elongation at break, whereas for the miscible blends, the PVDF spherulite acted as a crosslinking junction. The stretched part of the tensile samples in the partially miscible blends showed characteristic b-crystalline peaks in the Fourier transform infrared spectra, whereas that in the miscible blends showed a-crystalline peaks.

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Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)–acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties

Abolhasani

Guo

Jalali‐Arani

et al. 2013

J of Applied Polymer Sci

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“…One of the most facile but effective methods to improve the unfavorable toughness is the melt blending of PP and elastomers, such as ethylene‐propylene rubber (EPR),1–5 ethylene‐propylene‐diene terpolymer (EPDM)6–10 and ethylene‐octene copolymer (POE) 11–15. With regarding to polymer blends toughened by elastomers, many studies have been done based on the content and properties of elastomer,3, 7, 16–18 particles size and spatial distribution of elastomer,16, 19–26 elastomer particles deformation,27–29 and cavitations 21, 30. Particularly, previous research results have shown that PP blends with smaller elastomer particles are tougher and more ductile than those with larger particles, probably because the former blends represent a more efficient use of rubbery phase in promoting crazing and/or shear yielding of matrix 19…”

Section: Introductionmentioning

confidence: 99%

Effects of nucleating agents on microstructure and fracture toughness of poly(propylene)/ethylene‐propylene‐diene terpolymer blends

Bai

Wang

Song

et al. 2008

J Polym Sci B Polym Phys

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The effects of nucleating agents (NAs) on fracture toughness of injectionmolded isotactic poly(propylene)/ethylene-propylene-diene terpolymer (PP/EPDM) were studied in this work. Compared with PP/EPDM blends without any NA, PP/ EPDM/NA blends show very small and homogeneous PP spherulites. As we expected, PP/EPDM blends nucleated with b-phase NA aryl amides compound (TMB-5) present not only a significant enhancement in toughness but also a promotion of brittle-ductile transition. However, the addition of a-phase NA 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS) has no apparent effect on the toughness of the blends. The impact-fractured surface morphologies of such samples were analyzed via scanning electronic microscope (SEM). More detail work about the toughening mechanisms of elastomer and NA based on elastomer particles size and matrix crystal structures were carried out. Our results suggest that, besides the crystal structures of matrix, the elastomer particles size and size distribution plays an important role in controlling the toughening effect of nucleated PP/elastomer blends. The smaller the elastomer particles size and lower the polydispersity, the more apparent the synergistic toughening effect of NA and elastomer is. This investigation provides a fresh insight into the understanding of toughening mechanism of elastomers in PP blends and facilitates to the design of super toughened PP materials.

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“…Therefore, how to improve the impact toughness of PP resin has been extensively paid attention. It is generally known that the toughness of poly(propylene) (PP) can be improved by the addition of elastomer such as the ethylene/propylene copolymer (EPR)9, 10 and ethylene/propylene/diene terpolymer (EPDM) 11, 12. Among the elastomers used, poly(ethylene ‐co‐ octene) (PEOc) being narrow molecular weight distribution produced via metallocene technology has been commercialized and have distinctive properties due to long chain branching.…”

Section: Introductionmentioning

confidence: 99%

Real Space and Wave‐Number Space Studies of the Phase Structure and Morphology of iPP/PEOc Blends Using Scanning Electron Microscopy

Zhu

Song

2009

Macro Materials & Eng

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The influence of blend composition on the phase structure and morphology of poly(propylene)/poly(ethylene‐co‐octene) blends was studied using SEM. A diameter dg was defined and calculated in real space to discuss the phase structure and morphology of iPP/PEOc blends. The figure‐estimation method was introduced to determine the distribution width of dg. It was shown that the distribution of dg obeys a log‐normal distribution and the distribution width σ of dg was calculated. In wave‐number (h) space, the correlation distance, ac, was defined by applying light scattering theory to power spectrum images obtained by 2D Fourier transformation. Moreover, a fractal dimension, Dc, was introduced to describe the uniformity of the spatial distribution.magnified image

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Adding EPDM Rubber Makes Poly(propylene) Brittle

Cited by 19 publications

References 11 publications

Poly(vinylidene fluoride)–acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties

Poly(vinylidene fluoride)–acrylic rubber partially miscible blends: Phase behavior and its effects on the mechanical properties

Effects of nucleating agents on microstructure and fracture toughness of poly(propylene)/ethylene‐propylene‐diene terpolymer blends

Real Space and Wave‐Number Space Studies of the Phase Structure and Morphology of iPP/PEOc Blends Using Scanning Electron Microscopy

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