MCC-g-PAA/PVA/urea superabsorbent resin with slowly releasing fertilizer function is synthesized via UV light induced polymerization with microcrystalline cellulose (MCC),polyvinyl alcohol (PVA),and acrylic acid (AA) as raw materials,without any crosslinker and initiator.The structure of the resin is characterized by means of SEM,FT-IR,XRD,TG analyses etc.The influences of illumination time,material ratio,and monomer neutralization on water absorbency of the resin are explored.Results demonstrate that the swelling rates of MCC-g-PAA/PVA/urea prepared in a distilled water and a 0.9% NaCl solution are 970 g/g and 961 g/g,respectively when the mass of MCC accounts for 5% of AA mass,the mass of PVA accounts for 2% of AA mass,and the neutralization degree of AA is 55%.Furthermore,in soil water retention tests,the resin can effectively maintain soil moisture for over ten days.The sustained release rate of urea in the resin is approximately 90% after 26 days.Moreover,natural degradation of the resin reaches around 41% after 60 days.Finally,the growth simulation experiment confirms that the resin exhibits positive effect on plant growth.
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