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Biodegradable absorbing materials (BAMs) with and without the presence of pineapple leaf fiber (PF) were prepared from the reaction of chitosan, urea and citric acid using a simple hot-mixing process. The effects of constituent ratios and PF loadings on water-absorbing performance were investigated. FTIR results of BAMs indicated the successful synthesis of the crosslinked materials, whereas the intensity of XRD patterns showed very broad peaks due to a combination of amorphous and crystalline regions. Thermogravimetric results showed that more rapid degradation was observed for the prepared materials compared to the commercial water-absorbing material. Variations of constituent ratios slightly affected the water-absorbing performance of BAMs. The presence of PF in BAM clearly improved the water uptake and its water-absorbing performance (&gt;220 g/g) was found nearly the same level as that of a commercial diaper. BAM with the presence of PF has a potential application for slowing down the water evaporation rate from soil and hence reducing the watering cycles.

Water Holding Performance of Natural Fiber–filled Biodegradable Absorbing Materials