Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
Carbohydr Polym. 2013 Apr 15;94(1):539-46. doi: 10.1016/j.carbpol.2013.01.089. Epub 2013 Feb 4.
To better use wheat straw and minimize its negative impact on environment, a novel semi-interpenetrating polymer networks (semi-IPNs) superabsorbent resin (SAR) composed of wheat straw cellulose-g-poly (potassium acrylate) (WSC-g-PKA) network and linear polyvinyl alcohol (PVA) was prepared by polymerization in the presence of a redox initiating system. The structure and morphology of semi-IPNs SAR were characterized by means of FTIR, SEM and TGA, which confirmed that WSC and PVA participated in the graft polymerization reaction with acrylic acid (AA). The factors that can influence the water absorption of the semi-IPNs SAR were investigated and optimized, including the weight ratios of AA to WSC and PVA to WSC, the content of initiator and crosslinker, neutralization degree (ND) of AA, reaction temperature and time. The semi-IPNs SAR prepared under optimized synthesis condition gave the best water absorption of 266.82 g/g in distilled water and 34.32 g/g in 0.9 wt% NaCl solution.
为了更好地利用麦秆并将其对环境的负面影响降到最低，本研究采用氧化还原引发体系，通过聚合反应制备了一种新型的半互穿聚合物网络（semi-IPNs）超强吸水树脂（SAR），由麦秆纤维素-g-聚丙烯酸钾（WSC-g-PKA）网络和线性聚乙烯醇（PVA）组成。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和热重分析（TGA）对 semi-IPNs SAR 的结构和形态进行了表征，结果证实 WSC 和 PVA 与丙烯酸（AA）参与了接枝聚合反应。考察并优化了影响 semi-IPNs SAR 吸水性能的因素，包括 AA 与 WSC 及 PVA 与 WSC 的质量比、引发剂和交联剂的含量、AA 的中和度（ND）、反应温度和时间。在优化的合成条件下制备的 semi-IPNs SAR 在去离子水中的最大吸水率为 266.82 g/g，在 0.9 wt% NaCl 溶液中的吸水率为 34.32 g/g。
