【摘要】 三聚甲醛单晶经Co₆₀γ射线辐照可以得到一种结晶度很高的聚三聚甲醛。在辐照聚合制得的聚三聚甲醛的迴转图上,除出现普通聚甲醛的衍射点外,还存在着一些新的衍射斑点。 聚三聚甲醛沿着原来三聚甲醛的c轴可以劈成纤维,在迴转图中新的衍射斑点,当样品加温处理后会逐渐消失。 比较聚甲醛与三聚甲醛分子所占的空间,我们认为:聚甲醛确有四种不同取向的晶区,它们联结在一起形成许多曲棍状的微晶。更多还原

【Abstract】 Polyoxymethylene (polytrioxan’e) with very high degree of crystallinity can be obtained by γ-irradiation of trioxane single crystals with ,Co60 source. In the rotation diagram of polytrioxane obtained by γ-irradiation of trioxane there appear some new diffraction spots in addition to that for ordinary polyoxymethylene.Polytrioxane can be splitted into fibers along the C-axis of the original trioxane crystal. The new diffraction spots showing on the rotation diagram would gradually disappear by heat treatment of the sample.By comparing the spaces occupied by polytrioxane and trioxane molecules, we consider that there are four kinds of crystalline zones with different orientation in the polytrioxane crystals, which join together forming many crankshaft-shaped crystallites.更多还原