Abstract
Abstract This work deals with evaluating the role of starch derivatives on enhancing the performance of carbon xerogels (XACs), as HCHO-scavenger in producing environmentally friendly urea-formaldehyde (UF)- agro-based composites. In this respect, polyvinyl alcohol and amide modified starch (PVA-ST and AM-ST) were used. The XACs examined in hybrid scavengers were prepared from different aldehydes-based xerogels; while the substrates used for production of Agro-composites were rice straw (RS) and sugar cane bagasse (SCB). The results showed that, the hybrid scavenger led to increase the thermal stability of UF, as well as it provided acceptable UF adhesive system for producing environmental performance and highest strength agro-composites. Where, it produced bagasse composite with static bending properties 27.2 MPa MOR, 5734 MPa MOE and 0.87 MPa IB. The static bending values exceeded the requirements for class H-3 (ANSI Standard). The corresponding free formaldehyde value was reached to 9.5 mg/100 gm sample (reduction 66.7%).
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