Example calculations interphase thickness

Example Calculation of Interphase Thickness What is the theoretical interphase thickness for a polystyrene/poly(methyl methacrylate) material, annealed at 135 C, then quenched to room temperature ... 

The relative decrease in enthalpy should represent the extent of disorder at the interface of the two blocks, and has actually been directly correlated to the thickness of the interphase. That is, the AH of isotropization of lamellar PS-PChEMA (Scheme 26) containing pchEMA=0.56 is 81.4% of that of the homopolymer, indicating that the interphase should be approximately 18.6% of the liquid crystalline lamellae (12.5 nm). The calculated value of 2.3 nm corresponds very well to that measured by TEM following preferential staining of the interphase [207]. Nevertheless, variations in the extent of disorder at the interface as measured by decreased enthalpies of transitions may be due to variations in sample preparation and thermal history. For example, Gronski et al. s H-NMR experiments on deuterated PS-PBAz (Scheme 21) indicate that the disordered interphase present in powder samples is eliminated when the samples are oriented by shear for extensive time in the nematic mesophase [203]. 

Let us take, as an example, a 5- im particle surrounded by a 10 nm thick interphase. Calculation shows that the volume of the interphase is oifly approximately 1% of the particle volume. The influence... 

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