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A的含量越高，聚合物的交联度也就越大，聚合物网络也就变得更加致密，分子链的运动能力下降。这就导致了聚合物吸水后，聚合物网络不能有效膨胀，吸水倍率也就降低了。
The higher the content of A, the greater the degree of crosslinking of the polymer, the polymer network becomes more compact, the molecular chain of the decline in the ability of movement. This leads to the polymer after absorbing water, the polymer network can not be effectively expanded, bibulous rate is reduced.
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