Filling modification characterization

A useful characterization of these modified lignocellulosic materials would be that of the size or of the size distribution of the water-filled submicroscopic pockets and of the additional internal surface area in the water-swollen condition created by the various modifications. Characterization such as this based on adsorption measurements has been made by Stone and Scallon (34). Additional characterizations based on x-ray-scattering measurements are being carried out at the U. S. Forest Products Laboratory. 

Beside mechanical characterization, one important aim of this work is the evaluation of the effects of E-beam modification of PTFE powder on the friction and wear properties of PTFE-filled EPDM composites crosslinked by a radical-initiated peroxide system. Friction and wear properties of EPDM composites were... 

Another nice example of nanostructuring an MIP layer is the work published by Wu et al. [138, 139] who developed a label-free optical sensor based on molecularly imprinted photonic polymers. Photonic crystals were prepared by self-assembly of silica nanospheres. The space between the spheres was then filled with MIP precursor solution. After polymerization, the silica was dissolved, leaving an MIP in the form of a 3D-ordered interconnected macroporous inverse polymer opal (Fig. 15). The authors were able to detect traces of the herbicide atrazine at low concentrations in aqueous solution [139]. Analyte adsorption into the binding sites resulted in a change in Bragg diffraction of the polymer characterized by a color modification (Fig. 15). 

Han et al (1997) examined the chemorheology of a highly filled epoxy-resin moulding compound that is characterized by a modifed slit rheometer. Results show that a modified Cox-Merz rule relating dynamic and steady viscosities is established, >7(7 ) = (Tm )-Also the material was shown to exhibit a yield stress at low shear rates and power-law behaviour at higher shear rates. The temperature dependence of the viscosity is well predicted by a WLF model, and the cure effects are described by the Macosko relation. 

Gingham gig-om [modification of Malay genggang striped cloth] (1615) n. A woven fabric characterized by a block or check effect produced by weaving in dyed yarns at fixed intervals in both the warp and the filling. 

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