TITLE:
Polyvinyl Acetate and Vinyl Acetate-Ethylene Hybrid Adhesive: Synthesis, Characterization, and Properties
AUTHORS:
Ravindra V. Gadhave
KEYWORDS:
Ethylene-Vinyl Acetate Dispersion, Polyvinyl Acetate, Hybrid, Wood, Adhesive
JOURNAL NAME:
Open Journal of Polymer Chemistry,
Vol.14 No.1,
February
9,
2024
ABSTRACT: The goal is to develop a hybrid IPN network of polyvinyl acetate (PVAc)
and ethylene-vinyl acetate (VAE). In this research work, the vinyl acetate
(VAc)/ VAE hybrid emulsion and polyvinyl acetate emulsion (PVAc) were
effectively synthesized. Emulsions with
various characteristics have been developed by adjusting the weight ratios
between the vinyl acetate monomer and the VAE component. The impacts on the
mechanical, thermal, and physical properties of the films were investigated
using tests for pencil hardness, tensile shear strength, pH, contact angle
measurement, differential scanning calorimetry (DSC), and viscosity. When 5.0
weight percent VAE was added, the tensile shear strength in dry conditions
decreased by 18.75% after a 24-hour bonding period, the heat resistance
decreased by 26.29% (as per WATT 91) and the tensile shear strength decreased
by approximately 36.52% in wet conditions (per EN 204). The pristine sample’s
results were also confirmed by the contact angle test. The interpenetrating
network (IPN) formation in hybrid PVAc emulsion as primary bonds does not directly attach to PVAc and VAE chains. The addition of VAE reduced the mechanical properties
(at dry conditions) and heat resistance as per WATT 91. Contact angle analysis
demonstrated that PVAc adhesives containing VAE had increased water resistance
when compared to conventional PVA stabilised PVAc homopolymer-based adhesives.
When compared to virgin PVAc Homo, the water resistance of the PVAc emulsion
polymerization was enhanced by the addition of VAE.