Adhesion mechanisms of polyurethanes to glass surfaces. Part II. Phase separation in polyurethanes and its effects on adhesion to glass

Agrawal, Raj K.; Drzal, Lawrence T.

doi:10.1163/156856195x00068

Cited by 21 publications

(6 citation statements)

References 23 publications

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“…4). This trend also agrees with the results obtained by Agrawal and Drzal [33], who showed that in an elastomeric system a higher degree of phase separation did not produce better adhesion.…”

Section: Adhesion Propertiessupporting

confidence: 92%

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

Sánchez-Adsuar¹,

Martı́n-Martı́nez²

2000

Journal of Adhesion Science and Technology

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The composition and hard segment content of 13 commercial thermoplastic polyurethane elastomers (TPUs) were obtained using 1 H-nuclear magnetic resonance ( 1 H-NMR). The properties of the TPUs were studied using differentialscanning calorimetry(DSC), wide-angle X-ray diffraction (WAXD), dynamic mechanical thermal analysis (DMTA), and contact angle measurements. Solventbased adhesives were prepared by dissolving the TPUs in 2-butanone. Films of the TPUs were obtained by solvent evaporation, and their properties were studied. Adhesion properties were determined from T-peel tests on solvent-wiped poly(vinyl chloride) (PVC)/ polyurethane adhesive joints. The in uence of the segmented structure on the properties of the TPUs was assessed. The increase in the hard segment content in TPUs favoured the incompatibility (i.e. reduced phase separation) between hard and soft domains. TPUs with a high hard segment content had a low crystallinity, a low wettability, and a high joint strength. The storage and loss moduli obtained using DMTA decreased as the hard segment content in the TPUs increased. Furthermore, the TPUs prepared using "-polycaprolactone as the macroglycol had a slower crystallization rate than those prepared using the polyadipate of 1,4-butanediol or the polyadipate of 1,6-hexanediol. The increase in the length of the hydrocarbon chain of the macroglycol improved both the rheological and the thermal properties of the TPUs. Finally, TPUs prepared using MDI as the isocyanate showed a higher crystallinity and a higher degree of crosslinking than those prepared using TDI.

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Section: Adhesion Propertiessupporting

confidence: 92%

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

Sánchez-Adsuar¹,

Martı́n-Martı́nez²

2000

Journal of Adhesion Science and Technology

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“…Both types of glass fiber reinforced unhybridized composite samples (G’G’ and GG) exhibited the highest specific flexural modulus compared to both natural fiber reinforced samples ( Figure 6 ). The formation of an interphase region between a glass fiber and a PU matrix allows for the better dispersion and proper wetting of fibers into the matrix leading to better mechanical properties of the composites [ 26 ]. The addition of glass fiber resulted in lowering of modulus in hybridized flax composite samples by 42%, whereas the hybridization of hemp fiber resulted in a 55% improvement in modulus ( p < 0.05), when compared with just hemp fiber reinforced composite samples.…”

Section: Resultsmentioning

confidence: 99%

Influence of Hybridizing Flax and Hemp-Agave Fibers with Glass Fiber as Reinforcement in a Polyurethane Composite

et al. 2016

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In this study, six combinations of flax, hemp, and glass fiber were investigated for a hybrid reinforcement system in a polyurethane (PU) composite. The natural fibers were combined with glass fibers in a PU composite in order to achieve a better mechanical reinforcement in the composite material. The effect of fiber hybridization in PU composites was evaluated through physical and mechanical properties such as water absorption (WA), specific gravity (SG), coefficient of linear thermal expansion (CLTE), flexural and compression properties, and hardness. The mechanical properties of hybridized samples showed mixed trends compared to the unhybridized samples, but hybridization with glass fiber reduced water absorption by 37% and 43% for flax and hemp-agave PU composites respectively.

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“…We were unable to determine whether epoxy remained on the substrate surface as previously observed for films on glass [10][11][12] or whether failure occurred along the filmsubstrate interface as observed for this film system on aluminum. [1] However, we used a peel test to remove some films from the aluminized substrates and then examined the substrates using optical microscopy with Nemarski contrast and Attenuated Total Reflectance Spectroscopy.…”

Section: Mechanical Propertiesmentioning

confidence: 87%

Film Thickness Effects on Interfacial Fracture of Epoxy Bonds

et al. 2001

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Nanoindentation test techniques were combined with deposition of highly stressed overlayers to study the interfacial fracture susceptibility of spin coated Epon 828/T403 on aluminized glass substrates as a function of film thickness. The test techniques required to induce fracture differed between samples. Nevertheless, the resulting interfacial fracture energies decreased monotonically with film thickness to a value near 0.5 J/m 2 . This value is higher than the 'true work of adhesion' for uncured epoxy oliogomers on a methyl-terminated aluminum surface. However, it may indicate that we have irreversible specific interactions such as hydrogen bonding. Then 0.5 J/m 2 may be near the fundamental value for such an interaction, or the 'practical work of adhesion'.

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Adhesion mechanisms of polyurethanes to glass surfaces. Part II. Phase separation in polyurethanes and its effects on adhesion to glass

Cited by 21 publications

References 23 publications

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

Influence of Hybridizing Flax and Hemp-Agave Fibers with Glass Fiber as Reinforcement in a Polyurethane Composite

Film Thickness Effects on Interfacial Fracture of Epoxy Bonds

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