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M. Bank

Bio: M. Bank is an academic researcher from NCR Corporation. The author has contributed to research in topics: Polystyrene & Glass transition. The author has an hindex of 2, co-authored 2 publications receiving 253 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, it was shown that polystyrene-polyvinyl methyl ether (PVME) mixtures exhibit a degree of compatibility when cast from toluene, whereas they are incompatible if cast from chloroform or trichloroethylene.
Abstract: Past differential scanning calorimetry and dielectric relaxation measurements have established that polystyrene (PS)-poly(vinyl methyl ether) (PVME) mixtures exhibit a degree of compatibility when cast from toluene, whereas they are incompatible when cast from chloroform or trichloroethylene. The present study reports that toluene-cast mixtures can be phase-separated by thermal treatment at temperatures exceeding 125°C. This is true for samples containing 20–80 wt-% PS. The temperature of phase separation varies with heating rate; isothermal heating times needed to cause phase separation increase rapidly as the temperature approaches 125°C. Reversibility of the phase separation process depends upon such factors as cooling rate, annealing time, treatment temperature, and thermal history. By annealing and/or slow cooling, all thermally phase-separated mixtures have been brought back to their original state of compatibility. That is, there is no evidence for true irreversiblity of phase separation in thermally treated samples. Quench-cooled samples remain phase-separated indefinitely at room temperature, but this is attributed to rapid cooling below the glass transition of the PS. Chloroform-cast and trichloroethylene-cast mixtures have not been brought to a compatible state by thermal treatment, even after lengthy annealing and slow cooling steps.

59 citations


Cited by
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Journal ArticleDOI
TL;DR: The role of electron acceptor and electron-donor interactions in polar media, especially in aqueous media, is reviewed, together with the role of interfacial Lifshitz-van der Waals (LW) interactions, which, although often relatively weak, are always present as mentioned in this paper.

775 citations

Journal ArticleDOI
01 Jan 1980

492 citations

Journal ArticleDOI
01 Jan 1992-Polymer
TL;DR: In this article, the relationship between the miscibility and transesterification in the individual blend pairs is detailed in a review, including polyester liquid crystals, and a variety of polyester blends are discussed.

301 citations

Journal ArticleDOI
01 Jul 1990-Polymer
TL;DR: In this article, a general guide to polymer miscibility is presented, which is based on a simple balance between unfavourable physical forces, described in terms of non-hydrogen bonded solubility parameters, and favorable specific interactions.

272 citations

Journal ArticleDOI
TL;DR: In this paper, a simple dynamic scaling law was found on the scattering function I(q,t), where q is the scattering vector and ξ(t)=q−1m(t) is the correlation length of the periodic unmixed structure at time t which is measured by the position qm (t) of the scattering maximum at time T. The universal scaling functions (or the scaled structure function) F[qξ (t)] experimentally determined from the scattering functions for the lower quench depths (i.e., unmixing at 96.8
Abstract: Unmixing kinetics of quenched critical polymer mixture of polystyrene and poly(vinyl methyl ether) was investigated by time‐resolved light scattering technique. In the late stage of spinodal decomposition τ>60, τ being a reduced time, a simple dynamic scaling law was found on the scattering function I(q,t); I(q,t)∼ξ(t)3S[qξ(t)] with ξ(t)∼ta, where q is the scattering vector and ξ(t)=q−1m(t) is the correlation length of the periodic unmixed structure at time t which is measured by the position qm(t) of the scattering maximum at time t. The universal scaling functions (or the scaled structure function) F[qξ(t)] experimentally determined from the scattering functions for the lower quench depths (i.e., unmixing at 96.8, 97.3, and 98.2 °C, the spinodal temperature Ts being 95.8 °C) are in good agreement with that predicted by Furukawa, S(x)∼x2/(3+x8) for the critical mixtures (percolation regimes) in three dimensions [x=qξ(t)], although the scaling functions F(x) experimentally determined for the higher quen...

228 citations