Scatter strength properties

Since the scattering coefficient is a function of the paper structure, and is closely related to seme strength properties and to the surface area accessible to chemicals, closer attention to its changes may yield valuable information. 

Refractive index contrast The scattering strength of photonic crystal structures depends on a value known as the refractive index contrast. The refractive index contrast is defined by the ratio of the materials composing the structures the high dielectric constant to the low dielectric constant. As the refractive index contrast increases, fewer dielectric layers are needed to achieve photonic band-gap properties. 

The CTMP and CMP processes differ in the intensity of the chemical treatment and the yield. The yield of softwood CTMP is about 91% to 95%. CMP is more heavily chemically treated and therefore has more the character of a chemical pulp, i.e. higher strength properties at a cost of lower light-scattering coefficient (see Table 2.2). For hardwood, the yield of CMP can decrease to 80%. 

During mechanical defibration, lignin is plasticized and remains in the pulp. This is the reason for the lower strength properties but higher light-scattering... 

We now want to study the consequences of such a model with respect to the optical properties of a composite medium. For such a purpose, we will consider the phenomenological Lorentz-Drude model, based on the classical dispersion theory, in order to describe qualitatively the various components [20]. Therefore, a Drude term defined by the plasma frequency and scattering rate, will describe the optical response of the bulk metal or will define the intrinsic metallic properties (i.e., Zm((a) in Eq.(6)) of the small particles, while a harmonic Lorentz oscillator, defined by the resonance frequency, the damping and the mode strength parameters, will describe the insulating host (i.e., /((0) in Eq.(6)). 

For correlation with most physical properties (mechanical strength, optical scattering), mass average molecular mass of a polymer Mw" appears more satisfactory. Higher-power averages like z-average molecular mass "Mz" seem to better correlate with rheological properties. Expressions of M , Mw and Mz are... 

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