Effect of Casting Solvents on the Properties of Styrene-Butadiene-Styrene Block Copolymers Studied by Positron Annihilation Techniques

Djermouni, Belkacem; Ache, Hans J.

doi:10.1021/ma60073a030

Cited by 16 publications

(5 citation statements)

References 4 publications

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“…Many PAL temperature related studies have been carried out on polymers in order to correlate the changes in the free volume properties with phase transition phenomena (particularly T g ) [31][32][33][34][35][36][37] Generally, as might be expected, there is a significant change in the slope of the x 3 -temperature curve as the polymers pass through the glass transition temperature, with an increase in the slope above T g . Figure 10.…”

Section: Phase Transition Phenomena In Polymersmentioning

confidence: 99%

Application to Polymers

Mallon

2003

Principles and Applications of Positron and Positronium Chemistry

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Section: Phase Transition Phenomena In Polymersmentioning

confidence: 99%

Application to Polymers

Mallon

2003

Principles and Applications of Positron and Positronium Chemistry

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“…11,12 Several techniques are useful in studies of polymer interfaces, but they provide only indirect information. [12][13][14][15][16] Recently, a substantial amount of research work has been focused in mapping the morphology and composition of polymer blends and copolymers using AFM. 17 Some aspects of compositional identification are intrinsic to the AFM operation, as the interaction forces acting between tip and surface comprise of chemical information, and the sample indentation contains details about the viscoelastic properties of the sample.…”

Section: Introductionmentioning

confidence: 99%

“…Of all the properties of immiscible polymer blends, the interfacial properties between the two adjacent polymer phases are the least understood. The limited amount of information available about the polymer−polymer interface is a direct consequence of the fact that very few techniques allow one to study them directly. , Several techniques are useful in studies of polymer interfaces, but they provide only indirect information. − …”

Section: Introductionmentioning

confidence: 99%

Determination of Thermomechanical Properties of a Model Polymer Blend

Cappella

Kaliappan

2006

Macromolecules

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Force-displacement curves have been acquired with an atomic force microscope (AFM) on a model polymer blend of polystyrene/poly(n-butyl methacrylate) (PS/PnBMA) as a function of temperature. A novel analysis technique, based on Hertz theory, permitted us to determine Young's modulus of PS and PnBMA, away from the interface (at distances larger than 1 mm) as well as close to the interface (at distances smaller than 80 µm) with a resolution of 800 nm. The inherent difference in the glass transition temperature of the polymers resulted in their different viscoelastic behavior. For the first time, it is possible not only to measure Young's modulus of the model blend components but also to map the morphology of the PS/PnBMA model blend based on Young's modulus of the constituting polymers as a function of temperature. Furthermore, differences between the thermomechanical properties of the polymers away from and in the vicinity of the interface can be characterized. This important topic can be addressed only with a tool able to measure local quantities, and not with measurements based on averages on a large ensemble of molecules, like dynamic mechanical analysis (DMA). The modulus of PnBMA and PS calculated from AFM force-displacement curves is in excellent agreement with the DMA and AFM data from our previous measurements.

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“…Several indirect techniques are available for these studies, including some microscopy techniques such as electron scanning and transmission [2], infrared spectroscopy [4], Xray microanalyses [5] and scattering techniques and conventional methods such as mechanical, rheological, and measurements of interfacial tension [6]. In addition, fluorescence techniques are useful in studies of polymer compatibility [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of the morphology of two phase polymer blends on glass transition temperature

Serrano

Piérola

Bravo

et al. 2003

Journal of Materials Processing Technology

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Blends of poly(cyclohexylmethacrylate), PChMA, with poly(vinylacetate), PVAc, were prepared by casting THF and chloroform solutions. A calorimetric and morphologic study was performed. Differential scanning calorimetry investigations of the blends show two glass transition temperature that give evidence of inmiscibility. For polymer less flexible (PChMA) was observed an enhancement of T g by 20 8C approximately in blends of PVAc-rich composition. Epifluorescence microscopy, using PChMA labelled by copolymerization pirenyl-methylmethacrylate, Py, shows also phase separation providing imaging of the distribution of PChMA in the different domains and in the matrix. Blends containing 80% w/w PChMA show a bicontinuous primary morphology suggesting a spinodal phase separation mechanism. The 50 and 20% PChMA samples show morphologies composed of PChMA-rich domains in a matrix composed by PVAc mainly. Blends with domain-matrix morphology present a higher T g than pure homopolymer more rigid (PChMA) due to packing in microphases in matrix of more flexible polymer (PVAc).

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Effect of Casting Solvents on the Properties of Styrene-Butadiene-Styrene Block Copolymers Studied by Positron Annihilation Techniques

Cited by 16 publications

References 4 publications

Application to Polymers

Application to Polymers

Determination of Thermomechanical Properties of a Model Polymer Blend

Effect of the morphology of two phase polymer blends on glass transition temperature

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