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影响接枝共聚的因素 5.底物的特性(1～4节见本刊1987№1) 用来进行接枝的纤维素底物的物理状态是决定影响接枝反应特性的一个重要依据。纤维素可取粉末、纤维、薄膜等形式,发现粉末状态比纤维状态接枝程度相对提高得多,在薄膜情况下,由于单体的扩散限制,膜的厚度是非常重要的,从图8可明显看出,接枝程度随膜厚度的增加而降低。
Factors Affecting the Graft Copolymerization 5. Properties of Substrates (Section 1 ~ 4 See our publication 1987) 1 The physical state of the cellulose substrate used for grafting is an important basis for determining the characteristics that affect the grafting reaction. Cellulose may take the form of powders, fibers, films and the like, and it is found that the degree of grafting of the powder state is much higher than that of the fiber state. In the case of a film, the thickness of the film is very important due to the diffusion limitation of the monomer, It is seen that the degree of grafting decreases with increasing film thickness.