Preparation of rapidly absorbing bagasse cellulose-based composite superabsorbent material with semi-interpenetrating networks and its water absorption mechanism
Biomass-based superabsorbent materials have gained widespread attention for their biocompatibility and high-water absorption capacity in hygiene products. However, slow liquid absorption rate and inadequate salt resistance limit their applications. This study prepared a rapid composite superabsorbent (CAAMC/PVA) featuring a semi-interpenetrating polymer network (semi-IPN) by crosslinking bio co mpatible linear poly (vinyl alcohol) (PVA) with a bagasse cellulose-g-poly(acrylamide-co-acrylic acid)/modified nano-CaCO 3 network (CAAMC). The CAAMC/PVA surface displays intricate pores and a multilayer structure with a water contact angle of 52°, indicating high hydrophilicity and an excellent water absorption rate. The amount and duration of PVA significantly influenced the formation of the semi-IPN structure in CAAMC/PVA. The –OH groups on PVA interacted with CAAMC through hydrogen bonding, facilitating the formation of the semi-IPN and establishing rapid water-absorbing channels. CAAMC/PVA can absorb 290 g/g deionized water, 47 g/g 0.9 wt % NaCl solution, 42 g/g artificial blood, and 27 g/g artificial urine within 1 min, outperforming some commercial products. Furthermore, adsorption kinetic and Materials Studio simulations revealed that the –OH groups of PVA and the –COOH groups of AA synergistically enhance the absorption rate, with maximum adsorption energy for water molecules of −3.545 kJ/mol. This study presents a novel strategy for developing rapid composite superabsorbent utilizing waste biomass.
危险品化学品经营许可证（带存储）