Room-Temperature Curing Adhesive Based on Graft Copolymers of Natural Rubber and Poly(diacetone acrylamide)

Abstract:

Natural rubber latex grafted with poly(diacetone acrylamide), NR-g-PDAAM, was prepared with different weight ratios of NR/DAAM (i.e., 90/10, 95/5, and 97.5/2.5) by seeded emulsion polymerization at 50°C. The redox-initiation system, cumene hydroperoxide (CHP) and tetraethylene pentamine (TEPA), was used to initiate the polymerization. The results indicate that increasing of monomer concentrations led to a slight increase in the percentage conversion whereas the grafting efficiency of NR-g-PDAAM was not affected significantly. The chemical structure of the synthesized graft copolymers was confirmed by FTIR technique and the NR-g-PDAAM prepared using a NR/DAAM weight ratio of 95/5 was selected for the further preparation of adhesives. The feasibility of using adipic acid dihydrazide (ADH) as crosslinker for NR-g-PDAAM adhesives at room temperature was then investigated. An increase in the shear strength of the adhesive was observed with the addition of ADH. Additionally, an increase in the level of ADH crosslinker also resulted in a marked increase in the adhesion strength of adhesive. Based on these observations, it can be concluded that ADH is an effective crosslinker for NR-g-PDAAM based adhesive.

• Periodical: Advanced Materials Research (Volume 844)
• Pages: 353-356
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.844.353
• Online since: November 2013
• Authors: Bencha Thongnuanchan*, Rattanawadee Ninjan, Anchisa Bunsanong, Charoen Nakason
• Keywords: Diacetone Acrylamide, Graft Copolymerization, Natural Rubber (NR)

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