Durability of PEEK adhesive to stainless steel modified with aryldiazonium salts

TY - JOUR

T1 - Durability of PEEK adhesive to stainless steel modified with aryldiazonium salts

AU - Shimizu, Kyoko

AU - Malmos, Kristoffer

AU - Spiegelhauer, Susie Ann

AU - Hinke, Jens

AU - Holm, Allan Hjarbæk

AU - Pedersen, Steen Uttrup

AU - Daasbjerg, Kim

AU - Hinge, Mogens

PY - 2014/6/1

Y1 - 2014/6/1

N2 - In this work, a number of diazonium tetrafluroborates, i.e. 4-nitrobenzene (NB), 4-benzoylbenzene (BP), benzene, and 4-(2-aminoethyl)benzene (AEB) diazonium salts, were electrografted and applied as primers on stainless steel (SS) surfaces to test the resulting bond strength and durability of a polyetheretherketone (PEEK) coating. Lap shear test was used to assess both initial adhesion of PEEK to SS with and without primer, and the durability of these joints after immersion in boiling water. Subsequently, the loci of failure were determined by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analyses. Of the four primers investigated, only the NB gave improved initial strength as well as higher durability of the coating after boiling water treatment. In general, a strongly diminishing effect on the adhesion strength due to water penetration along the PEEK/SS interface followed by corrosion of the metal surface was found. Failure modes of the coated samples varied for the NB primer from cohesive failure close to the PEEK/primer interface under dry condition, to partly interfacial failure at the primer/SS interface after immersion into the boiling water for 5 h, while complete interfacial failure was found in the BP and the AEB primer cases.

AB - In this work, a number of diazonium tetrafluroborates, i.e. 4-nitrobenzene (NB), 4-benzoylbenzene (BP), benzene, and 4-(2-aminoethyl)benzene (AEB) diazonium salts, were electrografted and applied as primers on stainless steel (SS) surfaces to test the resulting bond strength and durability of a polyetheretherketone (PEEK) coating. Lap shear test was used to assess both initial adhesion of PEEK to SS with and without primer, and the durability of these joints after immersion in boiling water. Subsequently, the loci of failure were determined by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analyses. Of the four primers investigated, only the NB gave improved initial strength as well as higher durability of the coating after boiling water treatment. In general, a strongly diminishing effect on the adhesion strength due to water penetration along the PEEK/SS interface followed by corrosion of the metal surface was found. Failure modes of the coated samples varied for the NB primer from cohesive failure close to the PEEK/primer interface under dry condition, to partly interfacial failure at the primer/SS interface after immersion into the boiling water for 5 h, while complete interfacial failure was found in the BP and the AEB primer cases.

KW - Adhesion

KW - Aryldiazonium salts

KW - Electrochemistry

KW - Polyetheretherketone (PEEK)

KW - X-ray photoelectron spectroscopy (XPS)

U2 - 10.1016/j.ijadhadh.2014.02.002

DO - 10.1016/j.ijadhadh.2014.02.002

M3 - Journal article

AN - SCOPUS:84897743235

SN - 0143-7496

VL - 51

SP - 1

EP - 12

JO - International Journal of Adhesion and Adhesives

JF - International Journal of Adhesion and Adhesives

ER -