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首页> 外文会议>International Kenaf Symposium on International Development of Kenaf and Allied Fibers; 20030819-21; Beijing(CN) >Natural Kenaf Fiber Modified by Graft Polymerization and Its Composites
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Natural Kenaf Fiber Modified by Graft Polymerization and Its Composites

机译：接枝聚合改性天然红麻纤维及其复合材料

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摘要

The graft polymerization of methyl methacrylate (MMA) onto natural kenaf fibers initiated by cerium salt has been studied in a solution system using a pretreatment technique. To determine the optimum conditions for grafting, the effects of the variables such as pretreatment time, grafting time, polymerization temperature, eerie ion concentration, and monomer concentration were investigated. Grafting has also been carried out in the presence of additional organic solvent. The characterization of grafted-kenaf was conducted using FT-IR, SEM and TG/DTA. It was observed that the pretreatment of kenaf fibers with cerium salt solution in air is indispensable for the graft polymerization. It revealed that peroxides were formed during the pretreatment to initiate the graft polymerization. Graft yield was found to be optimum after 3 hours, yielding a value of up to 145%. Thermogravimetric analyses revealed that the grafted kenaf was more stable than original kenaf and PMMA. In order to examine the applicability of the grafted kenaf to the reinforcement of composite material, the grafted kenaf fiber was molded with PMMA powder into composite plates. The composite plate using untreated kenaf fiber was also prepared for comparison. Both of the composites were prepared by means of hot pressing. The grafted-kenaf composite showed improvements of failure strength, initial modulus and waterproof with the impartment of 47%, 33% and 72%, respectively.
机译：在使用预处理技术的溶液系统中，已经研究了甲基丙烯酸甲酯（MMA）在铈盐引发的天然洋麻纤维上的接枝聚合。为了确定最佳的接枝条件，研究了变量的影响，例如预处理时间，接枝时间，聚合温度，乙腈浓度和单体浓度。接枝也已经在另外的有机溶剂存在下进行。使用FT-IR，SEM和TG / DTA对接枝的洋麻进行表征。可以看出，在空气中用铈盐溶液预处理洋麻纤维对于接枝聚合是必不可少的。结果表明，在预处理过程中形成了过氧化物以引发接枝聚合反应。发现3小时后的接枝产率最佳，最高值为145％。热重分析表明，嫁接的洋麻比原始洋麻和PMMA更稳定。为了检验接枝洋麻纤维对复合材料增强的适用性，将接枝洋麻纤维与PMMA粉末模制成复合板。还准备了使用未处理的洋麻纤维的复合板以进行比较。两种复合材料均通过热压制备。接枝的洋麻复合材料的破坏强度，初始模量和防水性均得到改善，分别为47％，33％和72％。

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