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用声频共振法在-150°—170℃范围内测定了晶区构象为α、γ、γ+α型以及经不同拉体程度的聚酰胺-6单纤维的动态力学性质的温度谱。除三个已知的内耗峯—— -110℃(β_a),-40℃(β’_a),50℃(α_a)以外,对晶区为γ构象且含有单体及低聚体的聚酰胶-6观察到一个新的内耗峯,130℃(α’_a)。具有α构象的试样,其α_a内耗峯出现的温度较具有γ构象的试样为高。 经碘处理而未脱碘的聚酰胺-6,(β’_a)内耗峯高度显著增加,进一步证实β’_a内耗峯与自由酰胺基的运动有关。β’_a内耗峯的高度亦随拉伸比的增加而增高,说明在拉伸过程中,酰胺基之间的氢键有破坏的可能性。 出现在130℃处的α’_c内耗峯随拉伸比的增加其高度显著地下降,当拉伸到3.8倍时不再出现α’_c内耗峯。结合晶区分子链构象及碘处理对α’_c内耗峯的影响,我们认力α’_c内耗峯应为γ构象部分的松弛运动。
The temperature spectra of the dynamic mechanical properties of α, γ, γ + α-type conformations and polyamide-6 single fibers with different degree of bulk density were determined by the acoustic resonance method in the range of -150 ° -170 ° C. In addition to the three known internal friction peaks, -110 ° C (β_a), -40 ° C (β’_a), and 50 ° C (α_a), the poly Gum-6 observed a new internal friction peak, 130 ° C (α’_a). The samples with α-conformation exhibited higher peak at αα than those with γ-conformation. Polyamide-6, which was not deiodinated by iodine treatment, had a significant increase in the internal peak height of (β’-a), which further confirmed that the internal peak of β’-a was related to the free amide group. β’_a internal friction peak height also increased with the increase of draw ratio, indicating that during the stretching process, the amide bond between the possibility of destruction of hydrogen bonds. The α’_c internal friction peak appearing at 130 ℃ decreased significantly with the increase of draw ratio, and the internal friction peak of α’_c no longer appeared when stretched to 3.8 times. In combination with the influence of the conformation of molecular chain and the effect of iodine treatment on the internal friction peak of α’_c, we consider that the internal friction peak of α’_c should be the relaxation motion of the γ conformation.