• 作者： 王文濱
• 作者服務機構： 經濟部聯合工業研究所
• 中文摘要： 利用鈷六十珈瑪線之能量，不用觸媒，將苯乙烯、甲基丙烯酸甲酯及醋酸之烯等三種有機單體聚合於臺灣產檜本與杉木之木材組織中。所得之新型木材－－－塑膠結合物具有特殊優點，如（1）木材密度平均化，（2）木材硬度增加而提高附壓力約增 16-21 kg/ ，（3）吸水量甚低（木材塑膠結合物重量之20%以下），（4）在大氣中曝露試驗，不發霉無裂紋，（5）白蟻不食等等。含乙烯基之單體在天然木材、脫脂木材以及預先照射木材中聚合時，該反應變化率對珈瑪總照射線量及該反應速度與照射珈瑪線量率之關係，經過實驗檢討得知這些聚合反應方式為 （V：反應速度，α,κ： 恒數，R：照射珈瑪線量率）單體對木材纖維素之接枝反應率（Graft Percentage）不高，大部份為聚合反應。例外對這些聚合反應以遊離基聚合反應速度之觀點，誘導理論聚合式，得 (方程式無法摘錄)＋（ 及 κ 等都是恒數，[M]單體濃度）由此觀之，實驗聚合反應式極符合於遊離基聚合理論反應式之結論，即反應速度係對照射珈瑪線量率之平方根成正比例。
• 英文摘要： Styrene, methylmethacrylate and vinyl acetate have been polymerized into theconstitution of Taiwan cypress and cedar wood mzaterials. The new products ofwcod-plastic combinations were confirmed of their superiority as follows: (i) Homogenizing the density of wood materials (ii) Increasing the hardness of wood and enhancing the compressibility of woodto the range of 16-21 kg./ (iii) Minimizing considerably the water absorption of wood, not exceeding 20%of the weight of wood-plastic combinations (iv) Resistant to all weathers as well as antimolding and anticracking (v) Resistant to the encroaching of the white ants. The fundamental characters of those which are the relationship between totaldose and ccnversion and that between polymerizatian-rate and dose-rate, have beeninvestigated and discussed in detail, when monomers, contained vinyl radical, happenedto polymerize in the natural, deoiled and preirradiated wood materials. It was foundthat the equation of the polymerization-rate should be expressed, from experimentalresults, as (方程式無法摘錄)where V is the polymerization-rate, a and κ are constants, and R is the dose-rate.Low grade of grafting monomer radicals onto the wood cellulose was also confirmed.Meanwhile, the theoretical polymerization-rate equation cf this type was also derivedfrom the viewpoint of the free radical Folymerization mechanism, as (方程式無法摘錄)where , , and κ are the reaaction-rate constants and [M] means the concentration ofmonomer. From the experimental equation, it has been concluded that the polymerization-rate is proportional to the square root of the dose-rate and this fact has a goodcoincidence with the conclusion of the theoretical equation.
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