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Articles you may be interested inModeling lower critical solution temperature behavior of associating polymer brushes with classical density functional theory J. Chem. Phys. 139, 094904 (2013); 10.1063/1.4819957 Low-frequency mechanical spectroscopy study of conformational transition of polymer chains in concentrated solutions Rev. Sci. Instrum. 79, 126105 (2008); 10.1063/1.3043425Behavior of a polymer chain immersed in a binary mixture of solvents Scaling of demixing curves and crossover from critical to tricritical behavior in polymer solutionsWe propose a molecular thermodynamic framework to describe liquid-liquid equilibria of hyperbranched polymer solutions. The model is based on the lattice cluster theory and the hydrogen-bonding model. We examine phase behaviors of hyperbranched polymer solutions in the effect of a branched structure and hydrogen bonding formations among endgroups of hyperbranched polymer and solvent molecules. The solvent-solvent hydrogen bonding dominates phase behaviors of hyperbranched polymer/water systems. The endgroups of hyperbranched polymers also play a great role in determining phase separation of highly branched polymer structure.

ABSTRACT:We investigated the effect of reactive blending on the mechanical properties and morphology of high-density polyethylene (HDPE)/plasticized starch blends. HDPE was chemically modified to enhance the compatibility with the plasticized starch. The modified HDPE, HDPE-g-glycidyl methacrylate (GMA), was synthesized by melt reaction of HDPE in the presence of dicumyl peroxide (DCP). A finer dispersion of starch in the HDPE matrix was achieved compared to that in the unmodified HDPE. The amount of GMA groups in the modified HDPE enhanced the miscibility of HDPE/starch blends. We also observed that the amount of glycerin improves the mechanical properties of blends.

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The generalized lattice-fluid (GLF) model is extended to predict phase behaviors of polymer/solvent systems. The GLF model gives some difficulties in describing liquid-liquid equilibria (LLE) of binary polymer solution systems due to general assumptions on its derivation. An extended lattice-fluid (ELF) model is proposed by introducing a new universal constant (C 0 ) and a model parameter ( 11 ). The proposed model is then compared with experimental data for polymer/solvent systems and polymer1/polymer2 systems, which exhibit lower critical solution temperature (LCST) behaviors. Theoretical predictions and experimental results are in good agreement.