随样品存放时间增长，PHBV蠕变柔量逐渐下降，平衡应力下降。
With the store time goes on, the compliance and the balance stress of PHBV fibers decrease, due to the increase of crystallinity.
随着改性剂掺量的增大，蠕变柔量降低，恢复率增大，改性效果越好。
With the increase of the modifier dosage, creep compliance declined and recovery rate raised in the same time, the modification effect is better.
通过实验研究，给出了固体推进剂的体积蠕变柔量、体积松弛模量和材料的初始气孔率。
Based on the experimental study, volume creep compliance, volume relaxation modulus and their main curves and initial void content of solid propellant are given.
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