<<
>>

effects of dispersion in the filled polymeric materials

According to a principle Babin [181], electromagnetic radiation dispersion on apertures (pores) to identically dispersion on solids. Analyzing IK (fig. 3.3) can be noticed transmittance spectrums of polymeric composites, that reduction svetopropuskanija with growth of concentration of filler, in comparison with propuskaniem an initial polymeric film, is unequal for various compositions polymer-filler.

The greatest decrease propuskanija is revealed in case of filling of a polymeric matrix by titanium dioxide (on fig. 3.3). For polymeric composites with titanium dioxide is better the condition (4) is satisfied - the difference between refractivities of a polymeric matrix and filler is maximum. It is positioned also, that in all composites with talc practically it is not observed decrease propuskanija (fig. 3.3). However in systems with the lime carbonate having a close refractivity with talc, decrease propuskanija occurs (fig. 3.3, but to a lesser degree, than in composites with TiO2. As to montmorillonita it has appeared, that the effect of decrease propuskanija is displayed more poorly, than for lime carbonate (fig. 3.3), and depends in bolshej degrees on type of a polymeric matrix.

On TEM pictures of the polymeric composites presented on fig. 3.4, it is well visible, that the form and particle size of various fillers strongly differ. Initial particles montmorillonita, in comparison with other fillers, possess the least (nanometrovymi) in the sizes and in

77

Fig. 3.3. IK transmittance spectrums of polymeric composites on the basis of software, PETF and PS, filled with particles TiO2 (), СаСО3 (), Mmt () and talc () different concentration

Micron IK a range they start to "be displayed" (result in to decrease svetopropuskanija) only at the big degrees of admission from -

For aggregations of particles of filler.

Fig. 3.4. TEM pictures of polymeric composites of 1111+10 % TiO2 (), 1111+20 % СаСО3 (), ПКА+12 % Mmt (), 1111+30 % of talc () [182]

On fig. 3.5 are presented IK transmittance spectrums of composites ПП/СаСО3 and lHl∕TiO2с by various degree of admission in all range of lengths of waves. With growth of concentration of filler in a polymeric matrix S - the figurative excess characterising dispersion, is displaced from UF and visible
Areas in near IK area (fig. 5а, and 5в,) owing to formation

Aggregates from filler particles.

Fig. 3.5. IK transmittance spectrums of polymeric composites on the basis of PETF, filled СаСО3с concentration 10 () and 30 % () and on the basis of AI filled TiO2 with concentration 10 () and 30 % (). Spectrums are written down in near, centre and distant IK areas.

More detailed studying of an optical spectrum of films of polymeric composites lHl∕TiO2позволяет to evolve not one, and two characteristic excesses in near and far IK ranges (fig. 3.5 in,). It testifies to presence in the sample of particles of two most probable sizes (1,5—2,0 microns and ~30 microns). With growth of concentration of filler dispersion in distant IK a range also is displaced towards the big lengths of waves. It testifies that filler particles have bimodal distribution in the sizes, and to growth of degree of admission there is a big aggregation of particles of filler in the polymeric
Matrixes. Thereof there is a shift of a characteristic S-shaped excess towards the big lengths of waves.

3.3.

<< | >>
A source: Sitnikova Vera Evgenievna. SPECTROSCOPIC STUDYING of STRUCTURE of POLYMERIC DISPERSE SYSTEMS. The dissertation on competition of a scientific degree of a Cand.Chem.Sci. Tver - 2015. 2015

More on topic effects of dispersion in the filled polymeric materials:

  1. effects of dispersion in porous polymeric materials
  2. Ekvivalentnostultratonkih polymeric films on solid surfaces and the filled polymeric matrixes
  3. effects of dispersion in aqueous slurries
  4. CHAPTER 3. DISPERSION DISPLAY IN SPECTRUMS OF POLYMERIC DISPERSE SYSTEMS
  5. the Observational effects on examination of non-linear effects of ferroelectric materials
  6. influence of the sizes and the form of particles of filler and pores on properties of polymeric materials
  7. 1.6. CONDUCTING POLYMERIC MATERIALS
  8. the general problems of modelling of polymeric matrixes and nanostrukturirovannyh materials
  9. 4.2. Definition of effective diameter of pores and their distribution in the sizes in porous polymeric materials
  10. Non-linear effects in nanorazmernyh ferroelectric materials