Dynamic wetting of glass fibre and polymer fibre

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<jats:title>Abstract</jats:title><jats:p>To achieve high strength and chemical resistance in glass‐reinforced plastics, it has been found essential to have a good bond between matrix and reinforcement. To obtain this bond it is necessary that good wetting of reinforcement by matrix must occur at some stage in the production cycle.</jats:p><jats:p>Modern process developments have reduced the time during which wetting can occur to a few seconds in continuous sheeting manufacture. The wetting stage of this process has been investigated by the observation of dynamic contact angles. The rate of wetting has been found to be controlled by liquid flow and not surface tension at high processing speeds. Breakdown of this flow and intermittent wetting have been observed directly.</jats:p><jats:p>When low energy surfaces are wetted by water, a different limiting factor is found. It is observed that a maximum dynamic contact angle is reached at relatively low wetting rates. It is suggested that these maximum angles offer a new means of assessing Zisman's ‘critical surface tension’ (γ<jats:sub>c</jats:sub>) and by an extension of the technique may enable values of spreading pressure (π) to be measured.</jats:p>

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