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Polymers ABSTRACT A polymer-diluent model exhibiting antiplasticization has been developed and characterized by molecular dynamics simulations. Antiplasticizer molecules are shown to decrease the glass transition temperature T g but to increase the elastic moduli of the polymeric material in the low-temperature glass state.

The length of the strings exhibits a weaker temperature dependence in the antiplasticized glass-forming system than in the more fragile pure polymer, consistent with the Adam-Gibbs model of glass formation. Unexpectedly, the strings become increasingly concentrated in the antiplasticizer particles upon cooling.

Tuning Polymer Melt Fragility With Antiplasticizer Additives Published June 19, 2007 Author (s) Robert A. Riggleman, Jack F. Douglas, J J. de Pablo Abstract A polymer-diluent model exhibiting antiplasticization has beendeveloped and characterized by molecular dynamics simulations.

The addition of antiplasticizing molecules or nanoparticles is shown to make the polymer melt a stronger glass-forming material through the ratios of the chracteristic temperatures, the fragility parameter D from fits of relaxtion time data to the VFTH equation, and through the observation of the temperature dependence of the size of the

Moreover, the addition of antiplasticizing particles renders the polymer melt a stronger glass-forming material as determined by changes in the characteristic temperatures of glass formation,...