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以DCP化学交联同Co~(60)γ射綫輻射交联对比方法,研究了天然橡胶的交联效应,并从溶胶分数和溶胶部分的数均分子量估計了未塑炼天然橡胶的起始分子量分布,得出以下結論: 1.輻射交联的物理交联度和化学交联度,在实驗剂量范围内,它們均同剂量R成正比,相应的交联产率G值分別为G物=2.0和G化=0.54 2.得到溶胶部分的数均分子量(?)_(ns)同溶胶分数S和分布寬度参数σ間的关系式,并用此式从溶胶部分的数均分子量和溶胶分数等实驗数据估計了未塑炼天然橡胶的起始分子量分布。得到(?)_(wo)/(?)_(no)=2.7(σ=0.6)和A=0.44。最后对无規交联理論亦进行了一次驗証。3.溶胶部分的数均分子量以双对数作图,它同輻照剂量成直綫关系。
The cross-linking effect of natural rubber was studied by DCP chemical cross-linking with Co ~ (60) γ-ray radiation cross-linking method. From the beginning of unsoluced natural rubber, the sol fraction and the number average molecular weight Molecular weight distribution, draw the following conclusions: 1. Radiation cross-linking of the physical and chemical crosslinking degree, in the experimental dose range, they are proportional to the dose R, the corresponding cross-linked yield G values were G = 2.0 and G = 0.54 2. The relationship between the number average molecular weight (?) _ (Ns) of the sol portion and the parameter Solvail fraction S and the distribution width σ was obtained. From this, the number average molecular weight and the sol fraction The experimental data estimated the initial molecular weight distribution of unmixed natural rubber. (?) _ (Wo) / (?) _ (No) = 2.7 (σ = 0.6) and A = 0.44 are obtained. Finally, random cross-linking theory also conducted a verification. 3. The number average molecular weight of the sol fraction is plotted as double logarithms, which is linear with the irradiation dose.