Experiments showed that modified PAM is a kind of amphoteric PAM with low molecular weight and higher density of electric charge.

研究发现，实验所制得的改性聚丙烯酰胺是一种低分子量、较高电荷密度的两性聚丙烯酰胺。

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Compared with the unmodified PAM, it is found that the modified PAM can increase the settling rate, reduce the colour and turbidity of the sugar juice.

与未改性的PAM比较，发现改性的PAM能提高沉降速度，降低糖汁的色值和混浊度。

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Compared with cationic and amphoteric starches, modified PAM has obvious advantages in strength improvement, especially in the folding strength of paper.

与商品两性及阳离子淀粉比较，改性PAM在提高纸张强度方面有很好的效果，尤其是在提高纸张耐折度方面显现出明显优势。

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