The tensile strength of NEPE propellant had a little decrease but the elongation was significantly increased after adding of the chain extender.
扩链剂可以在拉伸强度少量降低的情况下大幅度提高NEPE推进剂的伸长率；
The chain extender is used to convert the low-activity hydroxy groups of both ends of the polydimethylsiloxane into high-activity isocyanate groups.
扩链剂是用来将聚二甲基硅氧烷两端活性较弱的羟基转变为高活性的异氰酸酯基。
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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