Page 22 - Handbook of Adhesion Promoters

2.3 Diffusion and entanglement 15

Figure 2.13. Raman bands of the material combination
PP/TPE − normalized band integrals along the line
scan. [Adapted, by permission, from Bruckmoser, K;
Resch, K; Kisslinger, T; Lucyshyn, T, Polym. Testing,
45, 122-33, 2015.]

Figure 2.12. SEM micrographs of cross-sections of
painted TPU/OBC blends. (upper) 25% TPU, (lower)
the same blend in extension. [Adapted, by permission,
from Song, J; Batra, A; Rego, JM; Macosco, CW,
Prog. Org. Coat., 72, 492-7, 2011.]

μm and +2 μm and PP is present between -1
μm and +5 μm (0 is the original inter-
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face). The results indicate that both mate-
rials were simultaneously detectable
between -1 μm and +2 μm, meaning that Figure 2.14. Effect of number of atoms in hydrocarbon
chain of silane on the shear strength of PAA/glass adhe-
the interdiffusion length was 3 μm for the sion. [Data from Jiang, ZX; Meng, LH; Huang, YD;
o
material combination of PP/TPE at 180 C. Liu, L; Lu, C, Appl. Surf. Sci., 253, 4338-43, 2007.]
For PC/TPE and PS/TPS the interdiffusion
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lengths were 2 μm and for PC/PMMA less than 1 μm. It was also noticeable that the
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selected temperature had important influence on the interdiffusion length.
The effect of entanglements was studied using silanes having different lengths of
19
hydrocarbon chain (methyl, propyl, octyl, and dodecyl). These silanes were grafted onto
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silica glass surface and compounded with polyarylacetylene. The physical entanglement
interaction between the chain of coupling agent and the chain of PAA resin was the main
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mechanism of the improvement of the interfacial adhesion (Figure 2.14).