Synthesize and Characterize of Grafted Soybean Protein Adhesives
Xiaoya Liu · Dadou kexue · 2008
The hydrophobic monomer GMA was grafted onto soy protein(SP)in order to obtain the much better water-resistant SP adhesives.The graft copolymer of SP-g-PGMA was prepared by free radical polymerization with APS-NaHSO3 redox system as initiator after SP was pretreated by 3 mol·L-1 urea solution which was as a denaturing agent.Pure grafted polymer was analyzed by IR indicating the success of grafting.Effect of different reaction conditions on grafted SP adhesives' shear strength and water resistance,such as pretreatment time,reaction time,addition of initiator,addition of monomer,reaction temperature were studied.The experiment illustrated that grafting reaction can improve the water resistance of SP adhesives,and the optimal reaction conditions was determined,and these reactions were:4 g wsp,3.39 g wGMA,0.2 g wNaHSO3,0.44g wAPS,3 h of reaction time and 70℃reaction temperature.