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Temperature effect on dynamic wetting of cellulosic substrates by molten polymers for composite processing

Abstract : Impregnation of plant fibre reinforcements by a molten polymer involves many phenomena still poorly understood , related to the solid morphology and its surface chemistry, but also to the temperature effect on liquid properties and solid/liquid interactions. The present work focuses on the temperature effect on forced dynamic wetting, using the Wilhelmy method and two model materials: a cellulosic film and two totally wetting paraffin oils. The results show that the dynamic contact angle vs. the capillary number (Ca) plot appears as a master curve. This curve is split in two domains. The domain associated with large Ca (Ca > 10 -3 ) is well described by the hydrodynamic approach. The domain with Ca < 10-3 corresponds to wetting processes operating on a smaller scale, which are more sensitive to the physico-chemical heterogeneities of the substrate. This study addresses the mechanisms governing the capillary pressure, void formation and interface generation during composite manufacturing.
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Submitted on : Thursday, September 3, 2020 - 3:06:32 PM
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Monica Francesca Pucci, Benoît Duchemin, Moussa Gomina, Joël Bréard. Temperature effect on dynamic wetting of cellulosic substrates by molten polymers for composite processing. Composites Part A: Applied Science and Manufacturing, Elsevier, 2018, 114, pp.307-315. ⟨10.1016/j.compositesa.2018.08.031⟩. ⟨hal-01930601⟩

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