Birefringence of a Block Copolymer Solution in the Stress Relaxation Process

Osaki, Kunihiro; Takatori, Eiichi; Kurata, Michio; Ohnuma, Hiroshi; Kotaka, Tadao

doi:10.1295/polymj.18.947

Cited by 17 publications

(28 citation statements)

References 14 publications

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“…For this same blend, a comparison of the PI Component dynamics as measured using the combined mechanical and birefringence measurements is made in figure 2 against the direct measurement available using infra-red dichroism. As seen in figure 2, the comparison between the two sets of data is very good, thereby justifying the form of the stress-optical rule given in equation (2). The component dynamic data shown in figure 1 can be used to investigate interactions between the PI and PB.…”

Section: Dynamics Of Compatible Blendssupporting

confidence: 54%

Optical rheometry of multicomponent polymer liquids

Fuller

1995

Macromolecular Symposia

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Recent advances in optical rheomeb-ic techniques are described, and applications of the methods are presented that motivate their use in elucidating the structure and dynamics of complex, polymeric liquids. Spectroscopic methods, such as infrared dichroism and 2-dimensional Raman scattering, which provide information concerning bond-level orientation dynamics are presentedh addition, the combination of birefringence and stress measurements is demonstrated to be capable of exuacting the component dynamics in some multicomponent systems. Examples of the use of these methods include orientation in block copolymers and compatible blends.

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Section: Dynamics Of Compatible Blendssupporting

confidence: 54%

Optical rheometry of multicomponent polymer liquids

Fuller

1995

Macromolecular Symposia

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“…This linear variation of the C with the composition for the PS-PM MA solution can be also found for a compatible blend of styrene-butadiene rubbers SBR. 16 For an incompatible blend of SBR, the variation of the C shows a non-linear pattern with the composition. As pointed out in the above section, the 7 and 9.5 wt% of the PS-PMMA solutions are in the compatible region.…”

Section: Stress-optical Coefficientmentioning

confidence: 99%

“…16 However, the stress-optical coefficients of the two pure materials in benzene have some states show a linear combination of two values of pure PS and PMMA with the compositions. This linear relation depicted as a dashed line in Figure 8 has a form as follows:…”

Section: Stress-optical Coefficientmentioning

confidence: 99%

Stress-Optical Coefficient of the Compatible Poly(styrene)-Poly(methyl methacrylate)-Benzene Solution System

Lim

Chung

1989

Polym J

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ABSTRACT:A ternary solution of poly(styrene)-poly(methyl methacrylate)-benzene has been studied rheo-optically. Shear viscosity of the PS-PMMA solutions measured by a capillary measuring apparatus is well fitted by the Hashin's blending rule. Flow birefringence 11n and orientation angle x of the solution in the steady shear flow is measured by the phase modulated flow birefringence (PMFB) technique. By comparing the shear viscosities measured in a capillary apparatus with the optical data from the PMFB, the stress-optical coefficients of the solution and of the pure PS and PMMA solutions are obtained. In a blend state, the value of stress-optical coefficient is able to be predicted as a simple linear additive relation with the values of two pure polymer species and the compositions. The stress-optical law is turned out to be applicable to compatible PS-PMMA-benzene solution system. KEY WORDS Ternary Solution / Poly(styrene)-Poly(methyl methacrylate)-Benzene / Stress-Optical Law / Stress-Optical Coefficient / Flow Birefringence / Phase Modulated Flow Birefringence / Polymer blend has been an important role in polymer science and technology because of its superior properties rather than those of homopolymers. The concept of physically blending of two existing polymers to obtain new products has not been fully understood. 1 Especially, an investigation of flow behaviors of the polymer blend system is one of the most interesting problems to be solved. So far, unfortunately, the development of a theoretical consideration for the polymer blends has been a very difficult work because of their complex behaviors. Therefore, an experimental study is an useful tool to understand the rheological properties of the polymer blends. the investigation of the rheological properties of the polymeric liquids under a certain deformation. 2 -5 This method can measure some rheological properties of the polymer materials such as the shear stress and the normal stress difference more accurately and easily rather than the mechanical measuring devices which have some shortcomings in measuring the rheological properties because of the inherent compliance of its force transducers. 2As one of the measuring techniques for the polymer system, the flow birefringence method has been considered as one of the most productive experimental techniques suitable for

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“…A simple, yet fundamental way to test a given model can be achieved by studying the relaxation of selected segments along a polymer chain. Such a study can be performed using labeled block copolymers [12][13][14][15][16]. Infrared dichroism has become a convenient method to examine segmental relaxation of isotopically labeled block copolymers [ 1 2 -15], and the experimen-*) Delivered as a Keynote Lecture at the Golden Jubilee Conference of the British Society of Rheology and Third European Rheology Conference, Edinburgh, 3 -7 September, 1990.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown by Osaki et al [13] that the relaxation of the central block in a solution of triblock copolymer, poly(methyl methacrylate)-polystyrene-poly(methyl methacrylate), can be measured with birefringence using the stress optical rule. Such measurement is possible if the different parts of the polymer have significantly different stress optical coefficients.…”

Section: Introductionmentioning

confidence: 99%

Relaxation dynamics of selected polymer chain segments and comparison with theoretical models

et al. 1990

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Abstract." Simultaneous measurement of infrared dichroism and birefringence is used to study selected polymer segment dynamics in isotopically labeled block copolymers. Two different polymers were studied: polybutadiene and poly (ethylene propylene). The first type consisted of a triblock with a short middle block labeled and a diblock with a short end block labeled, while the second type consisted of a triblock with three equal blocks and the end blocks labeled. Results of step strain experiments at -10 °C for polybutadiene and at room temperature for poly(ethylene propylene) indicated that segments located at chain ends relax faster than segments located at chain centers. These experimental data were compared to the predictions of two molecular models: the bead-spring model of Rouse and the tube model of Doi and Edwards, and it was found that both models correctly predict the qualitative features of segmental relaxation. However, the tube-model predictions were closer to the experimental results. In addition, when the effects of ofientational coupling interactions between segments in the melt were incorporated into this model, its predictions quantitatively agreed with the experimental results. The orientational coupling coefficient for poly(ethylene propylene) was 0.45 as measured from previous work, and for polybutadiene it was found to be 0.4.

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Birefringence of a Block Copolymer Solution in the Stress Relaxation Process

Cited by 17 publications

References 14 publications

Optical rheometry of multicomponent polymer liquids

Optical rheometry of multicomponent polymer liquids

Stress-Optical Coefficient of the Compatible Poly(styrene)-Poly(methyl methacrylate)-Benzene Solution System

Relaxation dynamics of selected polymer chain segments and comparison with theoretical models

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