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纤维素基高吸液材料的合成与表征
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摘要
木质纤维素基高吸液材料具有原料丰富、后加工简便和环境友好等优点,其研究一直为人们所关注。本论文以漂白针叶木浆、TMP为原料合成吸液材料。研究了漂白针叶木浆合成吸水材料、漂白针叶木浆合成吸油材料和TMP合成吸油材料,并用FTIR、SEM、XRD和TG等方法对产物进行了分析表征。研究结果表明:
     1、以环己烷为反应介质、过硫酸钾为引发剂、司盘60为分散剂、N,N-亚甲基双丙烯酰胺为交联剂,能成功的将AA接枝到漂白针叶木浆上去,制得高吸水材料。当丙烯酸单体与纸浆的质量比为7:1时,可以制得粉末状的吸水树脂;当丙烯酸单体与纤维的质量比为5:1时,可以制得纤维状吸水纤维。
     2、该高吸水性材料,吸水率高,吸水速率快;此高吸水材料具有较好的保水性能和反复使用性能;在15次的反复吸水试验中,产物的吸水倍率从498g/g下降到88g/g。
     3、Fe2+-H2O2-TD体系可成功高效的引发漂白针叶木浆接枝共聚MMA,且接枝效率很高,一般维持在90%以上,一定条件下接枝效率高达99%;针叶木浆接枝改性产品的吸油倍率基本上都维持在10g/g以上,最高可达17.5g/g,并且产品的纤维形态得以很好的保留。
     4、Fe2+-H2O2-TD体系可成功高效的引发TMP浆接枝共聚MMA,接枝效率很高,一般维持在80%以上,一定条件下接枝效率高达91%;TMP改性产品对0#柴油的吸油倍率基本上都维持在18g/g左右,最高可达20.8g/g;对环己烷的吸油倍率基本上都维持在14g/g左右,最高可达19.3g/g并且产品的纤维形态得以很好的保留。
     5、FTIR光谱分析为纤维素的改性提供了证据;扫描电镜(SEM)观察接枝纤维表面形貌,扁平的中空纤维细胞变得饱满;XRD显示接枝后纤维的结晶度下降;TG和DTG结果显示,接枝对针叶木原浆的热稳定性和最大热失重速率有影响,具体影响随接枝率变化。
The super liquor absorbent polymer basing on lignocellulose have advantages of materials abundant, further process convenient and envieriment friendly, which attract many investigators. The high liquor absorbent materials from bleached softwood pulp and high oil absorbent materials from bleached softwood pulp and TMP were synthesizied. The synthesizied products were characterized by FTIR、SEM、XRD and TG. The results show that:
     1. Using KPS as initiater, Span-60 as dispersant, N,N'-Methylenebisacrylamide as crosslinking and cyclohexane as reaction medium can graft crylic acid onto cellulose successfully. The products have high water absorbent property; When the weight ratio of monomer to fiber at 7:1, it can get high absorbency farinose products; while the weight ratio of monomer to fiber at 5:1, it can get high water absorbent fiber.
     2. The products have high and fast velocity water absorbent property; The fiber also have good water-keeping and reiterate water absorbent property.
     3. Fe2+-H2O2-TD system can initiate Methyl Methacrylate graft onto bleached softwood pulp successfully and effectively; Graft percent was always above 90%. In certain condition, the graft percent can reach 99%; The oil absorbent property of products was always keep above 10g/g; Some condtions can reached the highest level of 17.5g/g and fibre modality keep well.
     4. Fe2+-H2O2-TD system can initiate Methyl Methacrylate graft onto TMP pulp successfully and effectively and the graft percent was always above 80%; In certain condition, the graft percent can reach 91%; The oil absorbent property of modified products to 0# diesel oil was always about 18g/g; while to Cyclohexane was always about 14g/g.
     5. FTIR spectra proved that the graft reaction finished successfully; SEM found that the surface of products had PMMA; XRD results showed that crystal area had been damaged and the crystal percent descended; TG and DTG results showed that the modification treatment had effects on heat stability and max weightlessness velocity of products.
引文
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