Compatibilisation of PPE/SAN blends by triblock terpolymers: Correlation between block terpolymer composition, morphology and properties

Ruckdäschel, Holger; Sandler, Jan K.W.; Altstädt, Volker; Rettig, Cornelia; Schmalz, Holger; Abetz, Volker; Müller, Axel H. E.

doi:10.1016/j.polymer.2006.02.064

Cited by 53 publications

(70 citation statements)

References 35 publications

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“…The PPE phase does not appear fully dispersed but shows a remarkable degree of continuity, as demonstrated by the connectivity between the individual particles ( Fig. 3a and c) [19]. Furthermore, the observed morphologies reveal a significant degree of orientation; the PPE phase is highly elongated in the direction of the flow.…”

Section: Elastic Properties Of Ppe/san Blends (Low-strain Behaviour)mentioning

confidence: 94%

“…Different SBM triblock terpolymers with varying block lengths and a narrow molecular weight distribution were synthesised by sequential anionic polymerisation as described previously [19]. The molecular properties of the triblock terpolymers are summarised in Table 1.…”

Section: Materials and Compositionsmentioning

confidence: 99%

“…The sections were subsequently stained using OsO 4 and RuO 4 following an established procedure [3,7,19]. Due to this particular staining method, SAN and PPE appear as the bright and dark phase, respectively, whereas the PB block of the SBM appears black [19]. Bright-field transmission electron microscopy (TEM) was carried out using a Zeiss 902 TEM operating at an acceleration voltage of 80 kV.…”

Section: Morphological Investigationsmentioning

confidence: 99%

“…by taking into account the viscosity ratio [19]. As PPE contents above 60 wt% necessitate further increased processing temperatures exceeding the thermal stability of both neat PPE and SAN, and, in particular, of the SBM for the subsequent compatibilisation step [19], such blend compositions were not prepared.…”

Section: Elastic Properties Of Ppe/san Blends (Low-strain Behaviour)mentioning

confidence: 99%

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Toughening of immiscible PPE/SAN blends by triblock terpolymers

Ruckdäschel

Sandler

Altstädt

et al. 2007

Polymer

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The mechanical performance of immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and poly(styrene-co-acrylonitrile) (SAN) and the subsequent influence of compatibilisation by tailored polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock terpolymers (SBM) on the mechanical performance under static and dynamic loads is analysed in detail. A PPE/SAN 60/40 blend was selected as a base system for the compatibilisation experiments. The observed static tensile behaviour is described by micromechanical models and correlated to the blend microstructures as observed by transmission electron microscopy. In most cases, the addition of the SBM triblock terpolymers further enhances the ductility of the blend while only leading to a minor reduction of modulus and strength. Triblock terpolymers with symmetric end blocks, mainly located at the interface between PPE and SAN, led to nearly isotropic specimens. In contrast, SBM materials with a longer polystyrene block predominantly formed micelles in the PPE phase and the blends revealed a highly anisotropic morphology. Comparative investigations of the fatigue crack growth behaviour parallel to the direction of injection also reflected this variation in mechanical anisotropy of the compatibilised blends. A poor toughness and a predominant interfacial failure were observed in the case of the SBM with a long polystyrene block. In contrast, a considerable improvement in properties as a result of pronounced plastic deformations was observed for blends compatibilised by triblock terpolymers with symmetric end blocks. The systematic correlation between morphology and mechanical performance of compatibilised PPE/SAN blends established in this study provides an efficient way for the desired selection of suitable and effective compatibilising agents, ensuring both a superior multiaxial toughness as well as a high strength and modulus of the overall system.

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Section: Elastic Properties Of Ppe/san Blends (Low-strain Behaviour)mentioning

confidence: 94%

Section: Materials and Compositionsmentioning

confidence: 99%

Section: Morphological Investigationsmentioning

confidence: 99%

Section: Elastic Properties Of Ppe/san Blends (Low-strain Behaviour)mentioning

confidence: 99%

See 2 more Smart Citations

Toughening of immiscible PPE/SAN blends by triblock terpolymers

Ruckdäschel

Sandler

Altstädt

et al. 2007

Polymer

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“…They exhibit particular properties which are caused by the combination of different blocks most often leading to self-assembled periodic microphase separated structures. The application of block copolymers in modern material science varies from blends [5][6][7][8][9][10][11][12], nanopatterning [13][14][15][16][17][18] to membranes [19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Influence of block sequence and molecular weight on morphological, rheological and dielectric properties of weakly and strongly segregated styrene-isoprene triblock copolymers

Georgopanos

Handge

Abetz

et al. 2016

Polymer

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In this work, morphological, thermal, viscoelastic and dielectric properties of triblock copolymers consisting of styrene (S) and isoprene (I) blocks are discussed. SIS and ISI triblock copolymers were synthesized by sequential anionic polymerization, three of them exhibiting molecular weights below the entanglement molecular weight M e , three of them exhibiting molecular weights in the order of M e and two of them exhibiting molecular weights above M e . The objective of this work is the investigation of the influence of molecular weight and block sequence on relaxation of the block copolymer chains. Morphological investigations using small angle X-ray scattering and transmission electron microscopy studies reveal that a larger molecular weight is associated with a more pronounced microphase separation. The presence of two glass transition temperatures reveals microphase separation of the PI and PS blocks. The Fox-Flory equation was applied in order to describe the molecular weight dependence of the glass transition temperature of the polyisoprene and the polystyrene blocks. The analysis of rheological data reveals a Maxwell fluid behaviour for the weakly segregated block copolymers, whereas for the strongly segregated block copolymers a pronounced elastic behaviour at low frequencies of small amplitude shear oscillations was observed.In the intermediate regime of molecular weight, a complex viscoelastic behaviour appears. The plateau modulus G N o is influenced by the sequence of the PS and the PI blocks (SIS or ISI). Our analysis of segmental and normal mode relaxation in dielectric spectroscopy experiments show that the relaxation processes are strongly influenced by the block sequence (PI blocks tethered at one or 1 both ends) and the molecular weight. As a result, the block sequence in triblock copolymers influences dynamical properties in the glassy state and in the melt.

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Anionic Vinyl Polymerization

Baskaran¹,

Müller²

2009

Controlled and Living Polymerizations

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Compatibilisation of PPE/SAN blends by triblock terpolymers: Correlation between block terpolymer composition, morphology and properties

Cited by 53 publications

References 35 publications

Toughening of immiscible PPE/SAN blends by triblock terpolymers

Toughening of immiscible PPE/SAN blends by triblock terpolymers

Influence of block sequence and molecular weight on morphological, rheological and dielectric properties of weakly and strongly segregated styrene-isoprene triblock copolymers

Anionic Vinyl Polymerization

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