共查询到19条相似文献,搜索用时 31 毫秒
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研究烯类单体与羊毛纤维接枝共聚反应,分别制得Wool-MMA,Wool-EtMA,Wool-BuMA,Wool-BzMA系列接枝共聚物,讨论反应条件与接枝率的关系。 相似文献
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本文通过经不同处理后的羊毛纤维与甲基丙烯酸甲酯(MMA)单体接枝增重率的测定,接枝前后羊毛纤维的红外光谱分析,扫描电镜观察及ESR技术检测溶液和羊毛中的自由基,肯定了过氧化氢-乙二醛氧化还原体系可以引发甲基丙烯酸单体,通过自由基反应与羊毛发生接枝。羊毛纤维参加接枝反应的基团可能是—NH_2、—OH、—SH等。 相似文献
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羊毛甲基丙烯酸丁酯氧化-原接枝共聚探讨 总被引:1,自引:0,他引:1
文章研究探讨了以水为介质,以过硫酸铵和亚硫酸氢钠为氧化-还原引发剂来研究羊毛与甲基丙烯酸丁酯的接枝共聚反应,以及各种工艺因素对接枝效果的影响,并对接枝羊毛纤维的部分性能进行了研究. 相似文献
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文章研究探讨了以水为介质,以过硫酸铵和亚硫酸氢钠为氧化-还原引发剂来研究羊毛与甲基丙烯酸丁酯的接枝共聚反应,以及各种工艺因素对接枝效果的影响,并对接枝羊毛纤维的部分性能进行了研究。 相似文献
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采用化学接枝聚合技术对客舱用羊毛织物进行阻燃接枝改性,分别利用傅里叶变换红外光谱仪、X射线仪、极限氧指数测定仪、热分析仪等对接枝羊毛织物的结构和性能进行分析测试。结果表明:经阻燃接枝处理后,羊毛织物的燃烧性能大大提高,极限氧指数可以达到32%;通过红外光谱和X射线能谱分析可知,乙烯基单体接枝在纤维表面;通过扫描电子显微镜和原子力显微镜也可看出,单体与羊毛织物发生了反应;通过接枝前后羊毛织物的热重分析可知,经阻燃整理后羊毛织物的最大分解处温度降低了近25℃,而且裂解结束时接枝羊毛织物的残渣量远远高于未处理织物。 相似文献
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研究了丙烯腈与涤纶纤维的接枝共聚反应。从实验结果得出了聚合反应速率与引发剂浓度、单体浓度、纤维用量及反应温度的关系,并由此求出反应的表观速率方程和表观活化能。还对接枝纤维的性能进行了研究。 相似文献
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本文研究了用过硫酸钾(K_2S_2O_8)作引发剂,引发小麦淀粉与丙烯腈的接枝共聚反应,讨论了反应条件对该反应的影响及所得接枝淀粉的性质与结构特征。 相似文献
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本文报导了物理引发与化学引发对接枝指标的影响,通过对三种常见而价廉的化学引发剂的比较,得出淀粉与丙烯酰胺接枝共聚反应较为理想。以 Fe(11)/H_2O_2为引发剂,探讨了各种因素对丙烯酰胺与淀粉接枝共聚反应的影响,为接枝淀粉的利用打下了基础。 相似文献
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以玉米淀粉为原料,采用高锰酸钾/草酸引发体系合成了丙烯酸丁酯淀粉接枝共聚物,确定了最佳工艺条件,并通过红外光谱对其结构进行了表征。 相似文献
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Grafting of acrylonitrile on to guar gum by hydrogen peroxide initiation in aqueous media was achieved at different reaction conditions. Effects of hydrogen peroxide concentration and the amount of guar gum on grafting parameters have been discussed. Increasing H2O2 concentration (i. e. from 5 mmol to 20 mmol) increased the conversion of monomer and % add-on, whereas the average molecular weight of grafts and the grafting frequency decreased. An increase in the amount of guar gum also increased the conversion of monomer and grafting frequency but decreased the % add-on and increased the average molecular weight of the grafts. The graft copolymer is also characterized by infrared spectrophotometry. 相似文献
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Bipin K. Patel Vijay K. Sinha Chandrakant P. Patel Bhupendra Nath Misra Harikrishna C. Trivedi 《Starch - St?rke》1995,47(4):151-156
The graft copolymerization of acrylonitrile onto Sodium salt of Partially Carboxymethylated Amylose (Na-PCMA, DA=0.313) in aqueous and in water: methanol mixed solvents system has been studied using gamma rays from Co60 source as a means of initiation by the mutual method. The optimum condition for affording maximum percentage of grafting of acrylonitrile onto Na-PCMA has been obtained by varying different reaction parameters such as total dose, monomer concentration, amount of water and composition of solvents system. The mechanism of grafting has been postulated. The resulting graft copolymer has been characterized by chemical, spectroscopic, thermogravimetric and scanning electron microscopic methods. 相似文献
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The suitable conditions for graft copolymerization of acrylonitrile on to Leucaena glauca seed gum in aqueous system were investigated using hydrogen peroxide as initiator. For the purpose, a series of reactions have been carried out at different reaction conditions which cover the range of hydrogen peroxide concentration (5–20 mmole/l), acrylonitrile concentration (0.05–0.25 mole/l), backbone concentration (0.00617–0.03086 mole AGU) and polymerization time (30–180 min). The grafting temperature was kept at 85°C for all reactions. The products have been characterized by various methods including viscometry, spectrophotometry and thermometry. 相似文献