拉伸对尼龙1010熔融与结晶的影响

EFFECT OF DRAWING ON THE MELTING AND CRYSTALIZING BEHAVIOURS OF NYLON 1010

利用ＤＳＣ法研究了拉伸对尼龙１０１０熔融与结晶的影响．结果表明，伸长倍数（λ）较低时，ＤＳＣ曲线上只有一个溶融峰；λ较高时出现双熔融峰．λ≤１．５时，结晶度（Ｗｃ）随λ的增大而减小，λ＞１．５时，Ｗｃ随λ的增大而增大，λ≤２．５时Ｗｃ随拉伸温度（Ｔｄ）的升高而降低，λ≥３时，Ｗｃ与Ｔｄ基本无关或略有上升．拉伸速度ｖ＝１０ｍｍ／ｍｉｎ，λ≈２．５和ｖ＝１００ｍｍ／ｍｉｎ，λ≈３．３时，熔程（ΔＴ）有一极大值，ｖ＝１０ｍｍ／ｍｉｎ时，ΔＴ与Ｔｄ无关，ｖ＝１００ｍｍ／ｍｉｎ，Ｔｄ≈８０℃时，ΔＴ有一极大值．熔点Ｔｍ随λ的增大略有下降，而与Ｔｄ和ｖ无关．

The effect of drawing on the melting and crystalizing behaviours of nylon 1010 is studied by means of differential scanning calorimetry(DSC).The results indicate that there is only one melting peak in DSC curves when the drawing ratio(λ) is low, and there are two melting peaks when λ is high.Crystallinity (Wc) decreases as increasing λ when λ≤1.5,and Wc increases as increasing λ when λ>1.5. Wc decreases linearly as raising the drawing temperature (Td) when λ≤2.5,and Wc is basically independent to Td or increases slightly when λ≥3. The melting point (Tm) is independent to Td and the drawing speed (v).The melting range (ΔT) has a maximum when Td≈80 ℃.