共查询到19条相似文献,搜索用时 109 毫秒
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采用废旧橡胶粉为基体对其进行接枝改性。主要采用乳液聚合的方法在橡胶粉表面上接枝丙烯酸等单体。橡胶粉的前处理方法和工艺对接枝聚合反应有显著的影响。经过丙酮、碱液和酸液进行处理,可以进行丙烯酸和丙烯酰胺接枝聚合反应。利用红外光谱及扫描电镜对接枝产物进行了表征。结果表明单体已经接枝到橡胶粉上。标准API滤液测试表明,该产物是一种性能优良的无渗透钻井液处理剂。在同等条件下该材料的封闭滤失量(20 mL)小于FLC2000的封闭滤失量(36 mL)。通过TGA测试,该产物的热稳定性良好,符合实际应用的条件。 相似文献
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淀粉多元接枝高效吸水剂的合成 总被引:9,自引:2,他引:7
本文以对二硫酸铵为引发剂,N,N-亚甲基双丙烯酰胺为交联剂,将丙烯酸,丙烯酰胺与玉米淀粉接枝共聚,合成了高效吸水剂。采用正交实验的方法寻求最佳配方和工艺条件。 相似文献
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亚硫酸盐法制浆废液的接枝共聚改性研究 总被引:3,自引:0,他引:3
首次报道了亚硫酸盐法制浆废液与丙烯酸类单体的接枝共聚改性反应。提出影响改性反应的主要因素是过氧化氢引发剂的用量,研究表明合适的引发剂用量为废液固体物干重的2.5%——3.0%。同时,随着接枝共聚反应中单体用量的提高,改性产物的粘度逐步提高。由于所生成基团的亲水性不同,在相同单体用量下,丙烯酰胺(AM)单体改性产物的粘度要高于丙烯酸(AA)单体改性产物。二元接枝共聚改性研究表明,随着AM单体用量比例的提高,产物的粘度也逐步上升。 相似文献
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淀粉与丙烯酸接枝共聚的研究 总被引:13,自引:0,他引:13
采用过硫酸盐氧化方法将丙烯酸接枝到木薯淀粉上。研究了反应温度、反应时间、引发剂浓度和丙烯酸用量对接核反应的影响。反应温度升高,过硫酸盐分解速率加快,淀粉游离基增多,能提高接枝量和接枝效率。延长反应时间,可提高单体转化率,但对接枝量和接枝效率影响不大。引发剂用量以3.0×10~(-3)mol/L为宜。丙烯酸用量以2.5~5.0mol/L为宜。增加丙烯酸用量,均聚反应加快,对淀粉接枝不利。红外吸收光谱证明,淀粉-聚丙烯酸接枝共聚物出现淀粉和支链聚丙烯酸的特征吸收峰。电子扫描电镜图片表明,原淀粉表面光滑,呈球形颗粒结构。接枝淀粉表面沉积着聚合物,形貌上发生了很大的变化。由表观粘度随剪切速率升高而急剧下降可以看出,接枝共聚物的水溶液呈假塑性流体。高接枝量的接技物表观粘度较大,有较高的剪切稳定性。 相似文献
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在二甲苯溶液中以过氧化苯甲酰为引发剂研究了丙烯酸在聚乙烯上的接枝共聚。讨论了反应温度、单体浓度和引发剂浓度对接枝率的影响。用红外光谱、XPS、薄层色谱和接触角证实了接枝物的存在。又制备了接枝物钠盐。 相似文献
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淀粉接枝共聚合成吸水树脂工艺研究 总被引:4,自引:0,他引:4
以淀粉为原料,丙烯酸和丙烯酰胺为共聚单体,过硫酸铵为引发剂,N,N‘-亚甲基双丙烯酰胺为交联剂,采用接枝共聚法制备吸水树脂。研究了引发剂用量、交联剂量、单体与淀粉质量比以及丙烯酸和丙烯酰胺质量比对产品的吸水率的影响。实验结果表明:当引发剂占干物料质量的0.6%,交联剂质量占单体质量的0.8‰,单体与淀粉质量比为4,丙烯酸与丙烯酰胺质量比为1.33,产品的吸水率可超过550。 相似文献
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研究了以水为介质,丙烯酸——淀粉接枝共聚合成高吸水性树脂,讨论了交联剂用量、中和度、丙烯酸浓度、引发剂用量、淀粉用量等对树脂的吸水能力、保水能力、吸水速率、凝胶强度的影响。 相似文献
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The graft copolymerization of methyl‐methacrylate onto viscose fibers was studied under photoactive conditions with visible light using Ce4+/Ti3+ combination as redox initiator in a limited aqueous medium. Polymerization conducted in the presence of light at 30 ± 1°C produced significant grafting, compared with that conducted in the dark under the same conditions. The % grafting, % total conversion, and % grafting efficiency were studied by varying time, monomer concentration, initiator concentration, and pH of the medium. The mechanism of polymerization and graft copolymer formation have been discussed. Characterization of the grafted fibers was done by Fourier transform infrared spectroscopy and scanning electron microscopy. The effect of % grafting on thermal properties was studied by thermogravimetric analysis. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 135–140, 1999 相似文献
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Epoxy and polyester resins have been reinforced with methacrylamide (MAA) treated bamboo strip matting to develop bamboo fiber reinforced plastic composites. Bamboo mats were graft copolymerized with 1, 3, and 5% solution of MAA. The mechanical (tensile strength, elastic modulus, flexural strength, and flexural modulus), thermal, and water absorption properties of the composites were determined. One percent treatment of bamboo with MAA gave optimum results with epoxy resin. The mechanical properties were improved. TGA results reveal that the degradation temperature of the composite has improved after grafting. The weight loss of 1% MAA treated bamboo–epoxy composite reached a value of 95.132% at 795°C compared to 97.655% at 685°C of untreated bamboo–epoxy composite. Water absorption in the composites was studied by long term immersion and 2 h boiling in distilled water. The process of water absorption indicates Fickian mode of diffusion. MAA treatment results in reduced water uptake. There was improvement in the properties of pretreated bamboo‐polyester matrix composite as well. Three percent treatment of bamboo with MAA gave optimum results with polyester resin. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献