IR studies of adhesion promoters. Part 3.—Adsorption and coupling of bifunctional silanes on silica at the solid/liquid interface

Piers, Andrew S.; Rochester, Colin H.

doi:10.1039/ft9959101253

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…A weak peak, centered at 2835 cm -1 , was the only spectral feature resolvable in the SFG spectrum from the d 4 -PET/γ-GPS interface. This peak was characteristic of the symmetric C−H stretching of the silane methoxy headgroups. − The SFG spectrum obtained from the d 4 -PET/MVS interface was dominated by two overlapping peaks centered at 2950 and 2970 cm -1 . These features must have originated from the C−H stretching of the vinyl and methyl groups of MVS.…”

Section: Resultsmentioning

confidence: 99%

Sum Frequency Generation Vibrational Spectroscopic Studies on a Silane Adhesion-Promoting Mixture at a Polymer Interface

2005

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Sum frequency generation (SFG) vibrational spectroscopy was used to probe the interface between poly(ethylene terephthalate) with deuterated ethylene glycol subunits (d4-PET) and a silane adhesion-promoting mixture (SAPM) comprised of (3-glycidoxypropyl)trimethoxysilane (gamma-GPS) and a methylvinylsiloxanol (MVS). Such a mixture has been found to improve the adhesion of an addition-curing silicone elastomer to a range of plastic and metal substrates. Our results demonstrated that at the interface between d4-PET and a SAPM with a gamma-GPS/MVS ratio of 1:1 (w/w), the silane molecules not only segregated to the interface but also the methoxy headgroups likely adopted a greater net orientational order along the surface normal than at the d4-PET/gamma-GPS interface. The effects of varying the silane/siloxane ratio and using different siloxane oligomers on interfacial structures were also examined. This study provides unique molecular-level insights into the prerequisite conditions for adhesion of curable silicone adhesives.

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Section: Resultsmentioning

confidence: 99%

Sum Frequency Generation Vibrational Spectroscopic Studies on a Silane Adhesion-Promoting Mixture at a Polymer Interface

2005

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“…However, the study suggests that both keto-and enol-forms exist at solid/vapor interface. The adsorption of dioxane on porous silica and the adsorption behaviour of some silane derivatives on silica surface by using IR spectroscopic technique were also studied in similar line by the same workers [355][356][357][358].…”

Section: Adsorbate-adsorbent Interactionsmentioning

confidence: 98%

Adsorption of organic molecules on silica surface

Parida¹,

Dash²,

Patel³

et al. 2006

Advances in Colloid and Interface Science

609

360

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“…In studies focused on adhesion and delamination at silicon (oxide)/polymer interfaces, we have prepared a structurally well-defined system, modeled after the technologically important use of 3-aminopropyltrimethoxysilane (APS) as an adhesion promoter at these interfaces. Although APS has been used successfully in applications such as glass-fiber-reinforced composites, − polymer−metal adhesion, , and protection of microelectronics, the mechanism by which it enhances adhesion has been a matter of debate because of the lack of well-defined structure in the siloxane networks derived from this difunctional reagent. , In principle, hydrolysis and condensation of the silyl group at one end of the molecule could form a quasi-two-dimensional network anchored to the surface of SiO 2 through siloxane linkages, and the amine group at the other end could provide covalent linkages to a polymeric coating. In addition to this mode of bonding, which has been demonstrated for polyimide and model compounds, , however, the basic amine group can also react with surface silanols by proton transfer and hydrogen bonding as well as participate in the condensation reactions that form the siloxane network and thereby lead to the formation of complex multilayers …”

Section: Introductionmentioning

confidence: 99%

Stepwise Synthesis of a Well-Defined Silicon (Oxide)/Polyimide Interface

and

Ferguson

2001

Langmuir

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Self-assembly of 1-bromo-16-(trichlorosilyl)hexadecane leads to highly ordered bromide-terminated monolayer films on silicon (oxide) substrates. The bromides were converted to azides by treatment with sodium azide and then reduced to corresponding amines using lithium aluminum hydride. Protonation of these amine surfaces was difficult to reverse and rendered them unreactive toward electrophiles. The unprotonated form, however, reacted with molten phthalic anhydride to form the corresponding imide. These chemical transformations were characterized by ellipsometry, attenuated total reflectance infrared spectroscopy, contact angle goniometry, and X-ray photoelectron spectroscopy. Spin-coating of a polyamic acid, the precursor of poly-N,N-(4,4′-oxydiphenylene)pyromellitide, onto the pure amine-terminated surface, followed by curing (up to 350°C), resulted in covalent linkages between the substrate and the polymeric coating. The success of this curing was confirmed by infrared spectroscopy. Adhesion test results showed that this amine-terminated monolayer enhanced the adhesion of polyimide films to these substrates.

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IR studies of adhesion promoters. Part 3.—Adsorption and coupling of bifunctional silanes on silica at the solid/liquid interface

Cited by 17 publications

References 13 publications

Sum Frequency Generation Vibrational Spectroscopic Studies on a Silane Adhesion-Promoting Mixture at a Polymer Interface

Sum Frequency Generation Vibrational Spectroscopic Studies on a Silane Adhesion-Promoting Mixture at a Polymer Interface

Adsorption of organic molecules on silica surface

Stepwise Synthesis of a Well-Defined Silicon (Oxide)/Polyimide Interface

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