There existed an optimal dosage of the chain extender, lack of which caused deficiency of chain extension and excess of which led to more blocking reaction.

扩链剂的用量存在最佳值，用量不足时偶联反应不充分，用量过量时封端反应加剧。

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There existed an optimal dosage of the chain extender, lack of which caused deficiency of chain extension and excess of which led to more blocking reaction.

扩链剂的用量存在最佳值，用量不足时偶联反应不充分，用量过量时封端反应加剧。

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