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Title: Effects of nanomaterial additive on wood bonding properties of polyvinyl acetate adhesives cured using radio-frequency-based heating technology

Source: Res. in Prog. RIP-4706-005. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 2 p.

Author(s): Cai, Zhiyong ; Zhang, Jilei

Publication Year: 2020  View PDF »

Related Publications: view

Category: Research In Progress

Abstract: Water-based polyvinyl acetate (PVAc) adhesive is widely used in wood industries. In general, a solid mechanical interlocking polymer layer forms between two porous surfaces of wood materials permeated with PVAc adhesive after the drying process is completed. Common methods for drying PVAc adhesive in wood applications include 24-h natural drying, radio-frequency (RF) heating, and UV light. The RF heating method is capable of significantly reducing the time required to dry the PVAc adhesive. RF heating reduces the time required to obtain initial bonding strength, so the materials can be moved more quickly. Use of RF heating with PVAc, a polar-substance-based adhesive, raises issues related to its conductivity: if its conductivity is too high, then burning of the bonded wood substrates can result; if it is too low, then curing time would be longer. Graphene-structure-based carbon nanomaterials (GCNs), such as carbon nanotube and graphene, are promising candidate for applications in many fields of material science because of their superior mechanical, thermal, and electrical properties. Research related to GCNs as additives for reducing RF curing time of PVAc adhesive is limited. (Khan et al. (2013) reported the use of GCNs as additives to enhance adhesive strength of PVAc as a binder, but these GCNs were impractical because of their high cost.) Zhang and Cai (2017) and Cai et al. (2020) pointed out the opportunity to develop cost-effective processes to produce GCNs from renewable and sustainable biomass materials, especially by-products from the wood product industry, with the goals of minimizing curing time and enhancing bond strength of PVAc adhesives.

Keywords: Adhesive; polyvinyl acetate; nanomaterials; shear strength; radio frequency heating

Publication Review Process: Non-Refereed (Other)

File size: 372 kb(s)

Date posted: 08/04/2020
RITS Product ID: 98449
Current FPL Scientist associated with this product
Cai, Zhiyong
Supervisory Research Materials Engineer
  

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