Blockpolymers of styrene and isoprene with variable interphase: Morphology and dynamic viscoelastic behaviour

Annighöfer, Frank; Gronski, W.

doi:10.1007/bf01411513

Cited by 50 publications

(35 citation statements)

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“…The contribution to free volume from the linked chain end is, therefore, lower than for a free end. To compensate for this, some authors 19,20 have divided the K in the Fox-Flory equation for a PS homopolymer with 2. To our knowledge the limits to this approach have not been investigated, and the question is if it is applicable to all block copolymers independent of molecular weight and structure.…”

Section: Synthesized Block Copolymers and Propertiesmentioning

confidence: 98%

Low molecular weight block copolymers as plasticizers for polystyrene

Hansen

Nielsen

Hvilsted

2004

J of Applied Polymer Sci

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Polystyrene-b-alkyl, polystyrene-b-polybutadiene-b-polystyrene, and polystyrene-b-poly(propylene glycol)monotridecyl ether were synthesized using macro initiators and atom transfer radical polymerization or by esterifications of homopolymers. The aim was a maximum molecular weight of 4 kg/mol and minimum polystyrene content of 50 w/w %, which by us is predicted as the limits for solubility of polystyrene-b-alkyl in polystyrene. DSC showed polystyrene was plasticized, as seen by a reduction in glass transition temperature, by block copolymers consisting of a polystyrene block with molecular weight of approximately 1 kg/mol and an alkyl block with a molecular weight of approximately of 0.3 kg/mol. The efficiency of the block copolymers as plasticizers increases with decreasing molecular weight and polystyrene content. In addition, polystyrene-b-alkyl is found to be an efficient plasticizer also

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Section: Synthesized Block Copolymers and Propertiesmentioning

confidence: 98%

Low molecular weight block copolymers as plasticizers for polystyrene

Hansen

Nielsen

Hvilsted

2004

J of Applied Polymer Sci

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“…A technique that can yield both interfacial thickness and composition gradient across the interface is transmission electron microscopy (TEM) [10]. Results that are in good agreement with SAXS and DMTA [12] have been obtained for highly ordered systems, such as ABA-type block copolymers.…”

mentioning

confidence: 57%

“…An interesting morphological parameter, the degree of segregation in IPNs can be obtained from DMTA data using Lipatov's method [19]. The DMTA characterisation method developed by Annighofer and Gronskin [12] is only suitable for the study of the morphology of block copolymers with a high degree of orientation. In fact, it is difficult, quantitatively, to obtain either the weight (or volume) fraction of each phase or information on composition distribution in multi-phase polymeric materials from DMTA data.…”

mentioning

confidence: 99%

“…Porod's analysis [9] of small-angle X-ray (SAXS) and neutron scattering (SANS) data has been used to estimate interfacial thickness and domain size [10,11]. Dynamic mechanical thermal analysis (DMTA) data have been modelled [12] by assuming interfacial profiles. A technique that can yield both interfacial thickness and composition gradient across the interface is transmission electron microscopy (TEM) [10].…”

mentioning

confidence: 99%

“…Microscopies and scattering techniques [10,12] are used to study the micro-domain size, shape and interface content. TEM has been used in many instances in order to determine the miscibility, or phase segregation, of IPNs.…”

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confidence: 99%

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Applications of Modulated Temperature Differential Scanning Calorimetry to Polymer Blends and Related Systems

Hourston

Song

Hot Topics in Thermal Analysis and Calorimetry

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IntroductionThe characterisation of multi-component polymer materials [1] has been pursued vigorously in recent years. Many types of such materials (including polymer blends, block copolymers, structured latexes and interpenetrating polymer networks) are now commercially available [2,3] and their ever better characterisation remains important. It is necessary to obtain morphological parameters such as the thickness and weight fraction of interfaces/interphases 1 and to understand the relationships between morphology and mechanical properties of such multi-component polymeric materials [2][3][4][5][6][7][8]. A common feature across the spectrum of multi-component polymeric materials is the presence of interfaces [2,5,7,8]. The properties of the interface are invariably central to the properties of the composite and the ability to understand and optimise the interface is recognised as a key feature in the development of improved polymeric materials. Most polymer pairs are immiscible [5,6]. Thus, the majority of blends are two-phase and their morphology depends on the type of molecular interaction, the rheology of the components and the processing history. Models used to describe 1 The term interface implies a two-dimensional structure. It is clear in nearly all practical cases in polymer science that the regions between phases are three-dimensional in nature. These regions are also often likely not to be isotropic, but of a compositionally graded nature which means they do not meet the strict definition of a phase. In this chapter, the terms interface and interphase will be used essentially interchangeably.

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Microstructural and bulk characterization of two poly(siloxane‐imide) multiblock copolymers

Spontak

Williams

1989

J of Applied Polymer Sci

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Much of the unique thermomechanical behavior of microphase‐separated block copolymers is well established for the diblock and triblock architectures, and most of the data base involves polymers with polystyrene and polydiene blocks. However, there have been few reports about phase‐separated multiblocks composed of polysiloxane blocks and polyimide blocks. Here, using various facets of electron microscopy, we have characterized the domain sizes and elemental composition of these copolymers. In situ responses to both thermal annealing and tensile strain have been examined as well. To suggest possible structure‐property relationships, differential scanning calorimetry and rheological tests have also been conducted. Measurements are reported for glass‐transition and decomposition temperatures, linear viscoelastic properties (storage and loss moduli), and nonlinear stress‐strain tensile properties.

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Blockpolymers of styrene and isoprene with variable interphase: Morphology and dynamic viscoelastic behaviour

Cited by 50 publications

References 13 publications

Low molecular weight block copolymers as plasticizers for polystyrene

Low molecular weight block copolymers as plasticizers for polystyrene

Applications of Modulated Temperature Differential Scanning Calorimetry to Polymer Blends and Related Systems

Microstructural and bulk characterization of two poly(siloxane‐imide) multiblock copolymers

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