Author
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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196 citations
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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
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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
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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
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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
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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