Civil Engineering Reference
In-Depth Information
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Figure 14.7
2D-AFM images for
(a)
30 PAA/70 HPC,
(b)
30 PI/70 HPC,
(c)
70 PAA/30 HPC, and
(d)
70
PI/30 HPC [104] .
Figure 14.8
Optical microscopy images of i lms obtained from solutions of 75/25 wt/wt CAP/HPC blends
in dimethylacetamine at 20, 40, and 60 wt% concentrations. h e angles between polarizers was 45° [125].
polydomain structures with the helical axes of dif erent chiral nematic domains point-
ing in dif erent directions. h ese i lms from CAP and HPC liquid crystalline solutions
in both pure state and in mixture put into evidence some light areas whose sizes depend
on the HPC content and increase with increasing concentration. Moreover, some for-
mations of dif erent sizes and intensities, namely droplets, appear.
h e possibility of obtaining new materials with improved properties by mixing two
or more polymers represents an advantageous economical and technical solution more
appropriate than the design and synthesis of new polymers. In recent decades, theoreti-
cal and experimental scientii c research has been directed towards the development of
new classes of polymers, especially for biomaterial applications. Polymers and nano-
composites appear as classes of biomaterials with a special applicative potential capable
