Mechanical properties and the two-phase structure inside the heterophase domains of blends from HDPE and SBS star block copolymers

Stribeck, Norbert; Reimers, C.; Ghioca, Paul; Buzdugan, Emil

doi:10.1002/(sici)1099-0488(19980715)36:9<1423::aid-polb1>3.0.co;2-l

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…In particular {I} 2 (s 12 ) exhibits Porod's law with the scattering falling off with s 12 Ϫ3 . Small deviations from the predicted falloff are accounted to the nonideal structure of the real two-phase system 7,19 and corrected accordingly, leading to the 2D interference function G 2 (s 12 ) of an ideal twophase system…”

Section: Porod's Law and Systematic Deviationsmentioning

confidence: 99%

The equatorial small-angle scattering during the straining of poly(ether ester) and its analysis

Stribeck

1999

J. Polym. Sci. B Polym. Phys.

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A method for the quantitative analysis of two‐dimensional (2D) small‐angle X‐ray scattering (SAXS) patterns with fiber symmetry by successive information filtering is proposed and applied to a series of images recorded during a straining experiment of a two‐phase polymer sample at a synchrotron beamline. The studied equatorial scattering is similar to the frequently discussed void scattering, but originates from an ensemble of rodlike soft domains (needles) in the sample, orientated in the direction of strain. The intensity is extracted and projected onto the equatorial plane, the ideal two‐phase structure is extracted, and the 2D chord distribution is computed. This curve describes a 2D two‐phase morphology made from needle cross‐sections embedded in matrix material. Because interparticular correlation is found to be weak in the chord distribution, pure particle scattering is assumed. Modeling the needle cross‐sections by circular disks leads to a simple theory, which allows the deconvolution of a disk diameter distribution from the chord distribution. It is shown how parameters of the disk diameter distribution can be computed without deconvolution. For the selected poly(ether ester) thermoplastic elastomer the study of the soft domain needles indicates strain‐induced hardening. While for low elongation ϵ the soft needles are more compressible than the microfibrillar matrix, saturation is observed for ϵ > 2.5. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 975–981, 1999

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Section: Porod's Law and Systematic Deviationsmentioning

confidence: 99%

The equatorial small-angle scattering during the straining of poly(ether ester) and its analysis

Stribeck

1999

J. Polym. Sci. B Polym. Phys.

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“…Because PS and polyolefins are incompatible and their blends show poor mechanical properties, their compatibilization is of great interest. It has been found that diblock and triblock copolymers of styrene and butadiene6–14 and poly[styrene‐ block ‐(ethene‐ co ‐butene)‐ block ‐styrene]10, 12, 15–20 can serve as compatibilizers for PS/polyolefin blends. Grades of both copolymers, with quite a broad scale of molecular structures, are commercially available.…”

Section: Introductionmentioning

confidence: 99%

Effect of the molecular structure of ethene–propene and styrene–butadiene copolymers on their compatibilization efficiency in low‐density polyethylene/polystyrene blends

Starý

Fortelný

Kruliš

et al. 2007

J of Applied Polymer Sci

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The effect of the molecular structure of styrene-butadiene (SB) block copolymers and ethene-propene (EPM) random copolymers on the morphology and tensile impact strength of low-density polyethylene (LDPE)/polystyrene (PS) (75/25) blends has been studied. The molecular characteristics of SB block copolymers markedly influence their distribution in LDPE/PS blends. In all cases, an SB copolymer is present not only at the interface but also in the bulk phases; this depends on its molecular structure. In blends compatibilized with diblock copolymers, compartmentalized PS particles can also be observed. The highest toughness values have been achieved for blends compatibilized with triblock SB copolymers. A study of the compatibilization efficiency of SB copolymers with the same number of blocks has shown that copolymers with shorter PS blocks are more efficient. A comparison of the obtained results with previous results indicates that the compatibilization efficiency of a copolymer strongly depends both on the blend composition and on the properties of the components. The compatibilization efficiency of an EPM/SB mixture is markedly affected by the rheological properties of the copolymers. The addition of an EPM/ SB mixture containing EPM with a higher viscosity leads to a higher improvement or at least the same improvement in the tensile impact strength of a compatibilized blend as the same amount of neat SB.

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“…Small deviations from the predicted falloff are accounted to the non-ideal structure of the real two-phase system [51,52] and corrected accordingly. Thereafter the 2D interference function G 2 (s 12 ) of an ideal two-phase system…”

Section: −3mentioning

confidence: 99%

Scattering of Soft Condensed Matter: From Fundaments to Application

Stribeck¹

2009

Applications of Synchrotron Light to Scattering and Diffraction in Materials and Life Sciences

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Scattering data recorded in experiments on soft condensed matter are resulting in continuous scattering patterns which must be processed for structure analysis. The review presents scattering theory as a tool box with examples that show how to use it in practice. For some of the operations commented source code for computer programming is given. The focus is on the application to polymer and related materials.

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Mechanical properties and the two-phase structure inside the heterophase domains of blends from HDPE and SBS star block copolymers

Cited by 9 publications

References 11 publications

The equatorial small-angle scattering during the straining of poly(ether ester) and its analysis

The equatorial small-angle scattering during the straining of poly(ether ester) and its analysis

Effect of the molecular structure of ethene–propene and styrene–butadiene copolymers on their compatibilization efficiency in low‐density polyethylene/polystyrene blends

Scattering of Soft Condensed Matter: From Fundaments to Application

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