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Smart adhesion by surface treatment experimental and theoretical insights

To investigate how plasma treatment affected the surface structure and
 adhesion to polypropylene matrix and unsaturated polyester matrix, green
 abaca fibers were treated by low temperature plasma under different plasma
 processing parameters including treatment time, output power, and working
 gas. Abaca fibers were characterized by atomic force microscope, X-ray
 photoelectron spectroscopy, contact angle and interfacial shear strength.
 The results of contact angle and interfacial shear strength were consistent
 with the changes in surface roughness and the atomic ratio of the plasma
 treated abaca fibers with treatment time, output power, and working gas. It
 was concluded that the surface roughness and atomic ratio played a major
 role in the adhesion improvement of the plasma treated abaca fibers to
 polypropylene matrix and unsaturated polyester matrix due to the mechanical
 interlocking and chemical bonding, respectively. The geometrical potential
 theory was adopted to elucidate the mechanism of the adhesion property.