The effect of vinyl alcohol content on adhesion performance in poly(vinyl butyral)/glass systems

Abstract

The effect of the concentration of vinyl alcohol (VOH) groups in commercial poly(vinyl butyral) (PVB) on the adhesion of the polymer to glass beads in particle-filled composites is investigated. Both the optical single particle composite (SPC) and acoustic emission (AE) techniques were used to determine the applied uniaxial tensile stress at which a single imbedded particle was detached from the matrix. The results for the failure stress from the two techniques are consistent with one another and show that the adhesion strength is improved substantially as the vinyl alcohol content increases. The improved adhesion performance is attributed to an increase in condensation of hydroxyls within the polymer matrix and acid-base interactions between the hydroxyl groups on the bead's surface and those in the polymer. The AE results also provide details of the mechanism of the debonding event in cases of both weak and strong adhesion.

Coatings with recycled polyvinyl butyral on polyester and polyamide mono- and multifilament yarns

“…The exact composition of the polymer and its properties are determined by the production process. 3,4 The polymer is typically used in applications where strong chemical bonding, optical transparency, and good adhesion on surfaces are required. Due to these characteristics, it is often placed between two sheets of glass resulting in a laminate for car windshields with both excellent optical and shatterproof mechanical properties.…”

Stress/strain development around a spherical inclusion in a polymeric matrix: The effects of particle and matrix mechanical characteristics and thermal expansivity difference

“…In corroboration of the above statement are the results of a test in which a single glass bead of 300 μm diameter was incorporated in a PVB matrix 5, 6. Figure 7 shows the particle before and after failure under stress, with the dark region showing the debonded area.…”

“…In reality, the production of any composite featuring dissimilar elastic phases, results in thermal stresses at all existing interfaces. These residual stresses, caused by differences in the thermal coefficient of expansivity of the inclusions and the matrix, can develop in the samples simply by heating them to the processing temperature (e.g., curing temperature), and by cooling them down from such a temperature 5–7. Besides, throughout its lifetime, a coating composite system is subjected to numerous thermal cycles.…”

PVB Sheet Recycling and Degradation

“…Consecutive hydrolysis at acidic or basic ambient creates poly(vinyl alcohol) (PVAl) which provides poly(vinyl butyral) by acetalization with butyraldehyde at acidic environment. The final structure of high-molecular PVB is used for LSG manufacturing and it is compounded from atactic copolymers 80% of vinyl butyral, 18-23% of vinyl alcohol and up to 1% of vinyl acetate [Wade, D'Errico, et al, 2004;Dhaliwal, Hay, 2002;D'Errico, Jemmott, et al, 1996;Nghuen, Berg, 2004;Svoboda, et al, 1970). This chemical structure, viewed in Fig.1, is the same for every manufacturer today.…”