玉米秸秆/羧甲基纤维素复配水凝胶水分释放行为

以粉碎的玉米秸秆(RCS)和羧甲基纤维素(CMC)为原料,制备了含水质量分数可达97.47%的玉米秸秆/羧甲基纤维素复配水凝胶(RCS/CMC)。考察了交联剂、CMC和RCS用量对RCS/CMC凝胶模量的影响,凝胶在缓冲溶液中的降解行为和土壤中的失重行为,以及凝胶对土壤持水量、玉米种子萌发的影响。结果表明,与对照实验比较,RCS/CMC凝胶可以提高土壤持水率1.00%~1.61%,在37 ℃缓冲溶液中用纤维素酶处理4 d后降解率约80%,土壤中25 d后失重约94%;用CMC/RCS凝胶处理玉米种子,虽然平均延长了种子萌发时间,但种子的萌发率较高。其中相对湿度18%、20%、23%、26%、28%和30%的萌发试验,由于水分胁迫对照实验种子不能萌发,而CMC/RCS凝胶处理的种子发芽率仍可达到97%。

Water Release Behavior of Raw Corn Straw/carboxymethyl Cellulose Composite Hydrogel

Raw corn straw/carboxymethyl cellulose composite hydrogel(RCS/CMC) with the water content of 97.47% was prepared. The dependence of the modulus on the hydrogel compositions, the dependence of the degradation behavior in the buffer solution, mass loss behavior in soil, soil hydration and maize seed germination on the ratio of soil and CMC/RCS hydrogel were studied. The experimental results show that the soil moisture increases by 1.00%~1.61% compared with the control test, the degradation percentage of the hydrogel in the buffer solution containing cellulose enzyme at 37 ℃ after 4 days is about 80%, and the mass loss in soil is about 94% after 25 days. Though the average germination time extends apparently in the presence of hydrogel, the germination rate significantly increases, especially, for the processing in relative humidity of 18%, 20%, 23%, 26%, 28% and 30%, respectively, the maize seed germination is inhibited because of the water stress, but the germination rate is up to 97%.