Effect of Interfaces on the Crystallization Behavior of a Semicrystalline Polymer Conference Paper uri icon

abstract

  • The effect of sub-micron filler particles on the thermal behavior of a non-entangled semi- crystalline polymer, poly (dimethylsiloxane), PDMS, was investigated using Differential- Scanning Calorimetry (DSC). It was found that, in comparison to native PDMS melts, PDMS filled with solid additives of large surface areas crystallizes more efficiently. Different types of additives and surface interactions resulted in a similar effect, suggesting that the origins of the phenomenon may be attributed to entropic interactions in the boundary layer. In the absence of attractive (enthalpic) interactions a polymer will try to avoid the interface so as to minimize the entropic penalty. Thus, the ellipsoids close to the interface will orient in a way that the overall number of ellipsoids in the boundary layer is minimized. The orientational effect is expected to occur well above the glass-transition temperature, and is enhanced …

publication date

  • January 1, 2001