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速溶高分子量聚丙烯烯酸钠的合成研究 总被引:4,自引:0,他引:4
通过研究影响聚丙烯酸钠性能指标的各种因素,使用防交联剂、缓聚剂等助剂,合成了分子量≥3000万,溶解时间≤0.5h的速溶高分子量聚丙烯酸钠。 相似文献
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低分子量聚丙烯酸钠的合成 总被引:1,自引:0,他引:1
采用自由基溶液聚合方法制备了低分子量聚丙烯酸钠,研究了链转移剂用量、单体浓度、温度、反应时间及引发剂用量、加料方式等因素对聚丙烯酸钠分子量的影响。实验结果表明,合成了低分子量(500-10000)聚丙烯酸钠。 相似文献
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介绍了水溶性聚丙烯酸钠的制备方法.讨论了不同分子量的聚丙烯酸钠的性能,并对其应用进行了阐述。 相似文献
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以H2O2-NaHSO3为引发剂,在超声波辅助下引发丙烯酸单体聚合,研究了单体浓度、引发剂用量、反应温度等对单体转化率和聚丙烯酸钠分子量的影响。结果表明:控制单体浓度30%、引发剂用量4.0%、反应温度60℃,可制得聚丙烯酸钠的相对分子量在2000~3000之间。 相似文献
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研究了腐殖酸钠接枝型高吸水性树脂在土壤中的吸水和保水性能,结果表明,所合成的高吸水性树脂在土壤中具有良好的吸水性和保水性能。同时还可降低土壤容重,调节空气及热量分布,提高种子的发芽率和生长耐干旱性能。 相似文献
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A kind of novel superabsorbent hydrogel with high swelling ratio property that could be used for the development of water absorbing resin, soil water retention agent, and chemical sand‐fixing material was synthesized in this study. The hydrogels were prepared by the crosslinking reaction of polysuccinimide (PSI). The relationships between swelling ratio and volume of solvent as well as the concentration of crosslinking agent were investigated in detail. Several composites, such as starch, carrageenan, and polyacrylamide, were added into hydrogels to enhance the swelling ratio. It was found that the swelling ratio was significantly increased, which the maximum water absorbency was enhanced 2.46 times when the composite polyacrylamide (PAM) was added compared to the control. The effects of ionic strength and sensitivity of pH on hydrogels were also studied. The modified hydrogels products with swelling ratio less sensitivity to the salinity as well as relative high swelling ration in salinity system were also obtained by adding PAM. Through the Fourier transform infrared spectroscopy (FTIR) characterizations, the crosslinking reaction mechanism and the structure of composite were proposed. In addition, the transmission electron microscopy (TEM) examinations showed that some composite materials elevated the physical crosslinked and connected channels density substantially. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 550–557, 2006 相似文献
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结构型吸波复合材料具有吸波性能好、质量轻、可承载等优点,已成为当代吸波材料的主要发展方向,对隐身材料的设计和制造有着重要意义。本文从纤维增强体的截面形状和制备工艺、纤维的铺排结构和夹层复合结构、吸波剂改性等影响吸波复合材料吸波性能的主要因素出发,系统地总结了结构型吸波复合材料的最新研究热点和成果,并指出吸波复合材料的未来发展方向。 相似文献
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针对检188井区克上组油藏在开发中存在的突出问题,开展综合治理研究。通过提高系统压力,改善油层注水能力。在逐步恢复地层能量的基础上,按照"分区分治"原则开展注采结构调整,通过治理达到减缓油藏递减和改善油藏水驱状况的目的。 相似文献
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