Page 169 - Handbook of Adhesion Promoters

162 Selection of Adhesion Promoters for Different

The fusion protein EGFP-LCI formed densely packed monolayers of 4.1±0.2 nm thick-
7
ness. The green anchor peptide can generally be applied to a large variety of polypropyl-
7
ene-based materials (e.g., polypropylene fibers, yarns, etc.). The possible methods of
7
application include dip coating and spraying.
An addition of the adhesion promoter, such as maleated anhydride polypropylene,
8
between the aspen fibers and polymeric matrix improved the interfacial bonding. Adhe-
sion promoter affected the tensile and flexural properties and improved the microscopic
8
interfacial bonding between the fibers and matrix (Figure 8.7).
The maleated chlorinated polypropylene containing 21.8 wt% Cl was used as an
adhesion promoter for a blend of high-modulus isotactic polypropylene with a crystalline
9
ethylene-butene copolymer containing 9 wt% butene. The interface thickness was 15±2
9
nm.
Polypropylene with high maleic anhydride content (5-45 wt%), was prepared by
reacting a metallocene polypropylene having terminal unsaturations with one mole equiv-
alent of maleic anhydride to give polypropylene having a single unsaturation and a termi-
10
nal succinic anhydride moiety. This product is then reacted with an additional maleic
anhydride in the presence of a free radical initiator (such as a peroxide or UV radiation) to
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give a polypropylene with maleic anhydride moieties along the backbone.
Ethylene vinyl alcohol is one of the most effective barrier materials (against oxygen
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and aroma loss) used in the flexible packaging industries. The polar EVOH is not com-
patible with the non-polar polyolefinic film such as biaxially oriented polypropylene. The
laminate requires an adhesion promoter or tie-layer resin such as anhydride-modified
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polyolefin in order to adhere to a non-polar polyolefinic substrate.
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