将高分子化合物的单体浸入木材内部,用高能射线进行辐照,使单体在木材内部进行聚合,接枝共聚反应,可制备木材-塑料复合物,以达到提高木材强度,减少吸水性,增加尺寸形状的稳定性,增加抗微生物等性能。1965年美国开始投产,主要用作地板等。目前有二十几个国家都在积极开展研究,英国也有商品出售,所用木材品种包括软木和硬木如极木、山毛榉、桦木、松木、针纵红木、胡桃木、麻粟树、银松等;使用的单体主要为常温液态单体如甲基丙烯酸甲酯、苯乙烯、丙烯腈、醋酸乙烯酯等,也有使用易于液化的氯乙烯。制备工艺比较简单,一般都是先将木材抽真空,再将单体浸渍入木材内部,最后进行辐照。这种方法的缺点是木材遭受到辐射损伤,并且处理木材的形状大小易受辐射源的限制。我们采用甲基丙烯酸甲酯场外辐射聚合的方法,不辐照木材,只辐照单体。辐照时通入空气经过辐射氧化反应生成稳定的甲基丙烯酸甲酯过氧化物。使用前先通氮赶氧,预聚至一定粘度后浸入木材内,然后升温使单体聚合于木材内部。对于1毫米厚的薄板,加入微量还原剂,室温时经过氧化还原反应引发单体使在木材内部聚合。这种方法的优点是木材本身没有经受辐照不发生辐射降解,处理木材的形状大小不受辐射源的限制,并可使用低能大功率电子加速器。降低辐照装置成本。我们所用辐射源为国产402型电子静电加速器,电子能量为1.2Mev。所用木材品种为上海市木材公司技术研究设计室提供的桦木、锻木。所用甲基丙烯酸甲酯系试剂商品,经减 The high molecular compound monomer immersed in the interior of the wood, with high-energy radiation irradiation, the monomer within the wood polymerization, graft copolymerization, wood-plastic composites can be prepared in order to achieve increased wood strength, reduce water absorption, Increase the size of the shape stability, increase anti-microbial properties. The United States started production in 1965, mainly for floors. At present, there are more than two dozen countries actively carrying out research. There are also commodities sold in the United Kingdom. The wood species used include cork and hardwoods such as polar wood, beech, birch, pine, acacia, walnut, millet, The main monomers used at room temperature liquid monomers such as methyl methacrylate, styrene, acrylonitrile, vinyl acetate, etc., but also the use of liquefied vinyl chloride. Preparation process is relatively simple, generally are the first timber vacuum, and then dipping the monomer into the wood, the last irradiation. The disadvantage of this method is that the wood is damaged by the radiation and that the size of the treated wood is limited by the radiation source. We use polymethylmethacrylate radiation polymerization method, does not irradiate wood, only the monomer irradiation. Irradiation through the air through the radiation oxidation reaction to generate a stable methyl methacrylate peroxide. Nitrogen before use before the oxygen, pre-polymerization to a certain viscosity immersed in wood, and then heated to polymerize the monomer inside the wood. For a 1 mm thick sheet, a trace amount of reducing agent is added and the monomer is initiated by a redox reaction at room temperature to polymerize inside the wood. The advantage of this method is that the wood itself is not exposed to radiation without radiation degradation, the size of the treated wood is not limited by the source of radiation, and the use of low energy high power electron accelerators is possible. Reduce the cost of irradiation equipment. We use the radiation source for the domestic 402-type electron electrostatic accelerator, the electronic energy of 1.2Mev. Wood species used for the Shanghai Timber Company Technology Research and Design Room to provide birch, forging wood. Used methyl methacrylate reagent products, after reduction