Phase decomposition in blends of polycarbonate and isotactic poly(methyl methacrylate)

Kyu, Thein; Lim, Dong Soo

doi:10.1021/ma00012a028

Cited by 26 publications

(22 citation statements)

References 10 publications

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“…As an illustration, a typical time evolution of scattering profiles for a polycarbonate (PC)/isotactic poly(methyl methacrylate) (i-PMMA) blend following a tempera ture jump from ambient to 220 °C is depicted in Figure 10. 66 The scattering peak remains invariant for some initial periods up to 10 min. The plot of R(q)/q 2 vs. q 2 shows a straight line, suggesting the validity of the linearized CH theory ( Figure 11).…”

Section: (I) Early Stage Of Sdmentioning

confidence: 94%

“…74 The typical values of a as predicted by simulations based on the Monte Carlo method, Ising model, and Landau-Ginzburg model vary from 1/5 to l. 367374 Experimentally, the a value was found to be 1/3 in most high-polymer blends at shallow quenches, but it could cross over to 1 at late stages if the quench depths were large. [60][61][62][63][64][65][66] Typical quench depth dependences (log q m versus log t) for the polycarbonate (PC)/isotactic PMMA blend are depicted in Figure 16. 66 It appears that the observed power law relationship depends strongly on the polymer pairs, molecular weight, blend compositions (critical versus noncritical) and quench depths.…”

Section: Qjt)~mf)-'*tandmentioning

confidence: 99%

“…[60][61][62][63][64][65][66] Typical quench depth dependences (log q m versus log t) for the polycarbonate (PC)/isotactic PMMA blend are depicted in Figure 16. 66 It appears that the observed power law relationship depends strongly on the polymer pairs, molecular weight, blend compositions (critical versus noncritical) and quench depths. The a and j8 values themselves are often time dependent and cross over among various coarsening processes.…”

Section: Qjt)~mf)-'*tandmentioning

confidence: 99%

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Time-resolved Characterization of Polymer Phase Transitions

Kyu

1989

Comprehensive Polymer Science and Supplements

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Section: (I) Early Stage Of Sdmentioning

confidence: 94%

Section: Qjt)~mf)-'*tandmentioning

confidence: 99%

Section: Qjt)~mf)-'*tandmentioning

confidence: 99%

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Time-resolved Characterization of Polymer Phase Transitions

Kyu

1989

Comprehensive Polymer Science and Supplements

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“…Blends of polycarbonate (PC) and poly(methyl methacrylate) (PMMA) have been of considerable interest because of their potential applications as gas separation membranes1 and in the search for improved mechanical properties in blended materials. Despite intensive research1–15 for over 15 years, aspects as fundamental as their phase behavior and how, or even whether, the two polymers react remain controversial. Kyu and coworkers3–7 examined the phase behavior in solvent‐cast PC/PMMA blended films with optical methods and differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

“…Despite intensive research1–15 for over 15 years, aspects as fundamental as their phase behavior and how, or even whether, the two polymers react remain controversial. Kyu and coworkers3–7 examined the phase behavior in solvent‐cast PC/PMMA blended films with optical methods and differential scanning calorimetry (DSC). They reported that the polymer mixtures had a two‐phase region bounded by a lower critical solution temperature (LCST) and an upper critical solution temperature.…”

Section: Introductionmentioning

confidence: 99%

Interface development in polycarbonate/poly(methyl methacrylate) bilayer films

Richards

Thompson

Clough

et al. 2001

J Polym Sci B Polym Phys

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We report the effect of annealing over a range of temperatures and times on the mixing, stability, and interfacial width in thin bilayer films of bisphenol A-polycarbonate (PC) on deuterated poly(methyl methacrylate) (dPMMA). These bilayer films were highly stable when annealed at temperatures of up to 438 K, the temperature at which the degradation of the blends of these materials was first detectable by thermogravimetric analysis. At higher temperatures, dewetting of the PC upper layer of the film occurred at an increasing rate. Nuclear reaction analysis showed that the PC and dPMMA layers remained segregated. Neutron reflectometry data showed that the interfacial width between the two polymer layers grew rapidly from 0.5 nm for an unannealed sample to approximately 4.0 nm, the latter value being in good agreement with the predicted value for the interfacial width in the absence of any reaction. Extended annealing at 438 K and lower temperatures had no effect on the interfacial width, whereas at higher temperatures, the interfacial width increased to approximately 5.5 nm before the films became unstable. The broadening of the interface found at higher annealing temperatures was attributed to an increase in the miscibility of the polymers induced by the monomer from the unzipping of the dPMMA chains. There was no evidence of a thermally induced chemical reaction between the two polymers.

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Solubility of Polymers

Eckelt¹,

Eckelt²,

Wolf³

2011

Encyclopedia of Polymer Science and Technology

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Detailed knowledge concerning the phase state (homogeneous or coexistence of two or more condensed phases) of polymer containing mixtures is indispensible in virtually any area related to the production or application of macromolecules. In addition to this qualitative information it is for many purposes highly desirable to dispose of quantitative data regarding solvent quality or, more generally, with respect to the thermodynamic interaction between the components of the mixtures. This contribution starts with a brief presentation of the thermodynamic criteria deciding on the phase state and presents the experimental methods used in this area. The next section gives an overview on typical behaviors of polymer solutions and polymer blends; it is followed by a part recalling widely used theoretical approaches. Finally, a data section collects solvents and non‐solvents for a large number of polymers and presents some examples for the quantitative thermodynamic description of polymer solutions.

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Phase decomposition in blends of polycarbonate and isotactic poly(methyl methacrylate)

Cited by 26 publications

References 10 publications

Time-resolved Characterization of Polymer Phase Transitions

Time-resolved Characterization of Polymer Phase Transitions

Interface development in polycarbonate/poly(methyl methacrylate) bilayer films

Solubility of Polymers

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